Toro VIN 30581- Diesel Engine Service Manual

For use with Toro VIN 30581-

Diesel Engine Service Manual 3.33 GENERAL

SPECIFICATIONS Toro 3058130581-

Model designation Type

Water-cooled, 4-stroke cycle

No. of cylinders - arrangement

4 - in line

Combustion chamber type

Direct injection

General

Valve mechanism

Overhead

Cylinder bore x stroke mm [in.]

94 x 120 [3.70 x 4.72]

Piston displacement liter [cu in.]

3.331 [203]

Compression ratio

17 : 1

Firing order

1-3-4-2

Direction of rotation

Dimension

Counterclockwise as viewed from flywheel side Overall length mm [in.]

781 [30.7]

Overall width mm [in.]

593 [23.3]

Overall heigth mm [in.]

821 [32.3]

Weigth (dry) kg [lb.]

250 [551]

Type of cylinder sleeve

Intergral with cylinder block

Engine main parts

Compression ring

2

No. of piston ring Oil ring

1 (w/spring expander) Open

BTDC 18째

Close

ABDC 54째

Open

BBDC 66째

Close

ATDC 22째

Inlet valve Valve timing Exhaust valve Starting system

Electric-starter

Inlet and exhaust systems

Starting aid Air cleaner

Glow plugs Type

Model

Paper element

__

Toro 30581- Engine parts phone: 269 673 1638 email: EngineParts@HeavyEquipmentRestorationParts.com

SPECIFICATIONS

GENERAL 30581-

Model designation Type

Force feed by oil pump Specification

Engine oil

Capacity (engine) liter [U.S. gal}

Class CD oil (API Service Classification) Approx. 10 [2.6] (Oil pan: 9 [2.4], Filter: 1 [0.3])

Lubrication system

Type Oil pump

Trochoid

Speed ratio to crankshaft Capacity liter [U.S. gal]

0.74 28.6 [7.6] at 0.3 MPa (3 kgf/cm2) discharge pressure of pump running at 2 230 rpm

Type Relief valve

Opening pressure MPa (kgf/cm2) [psi]

Oil Cooler

Type

Oil filter

Type

Safety valve

Opening pressure MPa (kgf/cm2) [psi]

Piston valve 0.35 ± 0.05 (3.5 ± 0.5) [50 ± 7] __

Water-cooled multi-plate Cartridge of paper element

__

1.1 (11) [156]

Refill capacity (engine water jacket) liter [U.S. gal.]

Type

Cooling system

Water pump

Speed ration to crankshaft Capacity liter [U.S. gal.]/ min/rpm

Fan belt

Thermostat

Centrifugal 1.3 160 [42.3] at 0.075 MPa [0.75 kgf/cm2] discharge pressure of pump runnning at 3600 rpm

Type

Low-edge B type V-belt x 1

Type

Wax pellet

Valve opening temperature °C [°F] Type

Fan

5 [1.3]

No. of blade Diameter mm [in.]

76.5 ± 1.5 [170 ± 2.7] Pusher (PP) 6 440 [17.3]

GENERAL

SPECIFICATIONS 30581-

Model designation Type Injection pump

Bosch A

Diameter of plunger mm [in.]

Type

9 [0.354] Bosch, piston

Feed pump

Fuel system

Cam lobe lift mm [in.]

Governor

Type

9 [0.354] Bosch RSV, centrifugal

Type of nozzle

Bosch hole

No. of spray orifice Injection nozzle

4

Diameter of spray orifice mm [in.]

0.28 [0.011] (for D/G) 0.24 [0.009] (for Power Unit)

Spray angle

155°

Valve opening pressure MPa (kgf/cm2) [psi] Fuel filter

Type

Model

M008T75171

Type

Pinion shift

Output V - kW

12 - 2.2

No. of pinion teeth/flywheel ring gear teeth

10 / 122

Electrical system

Type Output V - A Working speed rpm Alternator

3-phase, with rectifier 12 - 50 1000 to 18000

Rated output generating speed rpm

5000

Maximum permissible speed rpm

22000

Speed ratio to crankshaft Type Glow plug

Cartridge of paper element 12V - \ ground

Voltage - polarity

Starter

17.65 (180) [2561]

Rated voltage - current V A Rated voltage V

2.0 Sheathed Direct injection: 11 - 5.5 (30 sec. rating) 12

Stop solenoid (option) Rated temp. °C [°F]

20 [68]

MAINTENANCE STANDARDS TABLE

MAINTENANCE STANDARDS MAINTENANCE STANDARDS

4

MAINTENANCE STANDARDS TABLE Unit: mm [in.]

Group

Inspection Point

Maximum rpm, (no-load) Minimum rpm, (no-load) Compression pressure MPa (kgf/cm2) [psi]

Assembly Standard (Standard Clearance)

2.9 (30) [427] at 300 rpm

Service Limit (Clearance)

2.6 (27) [384] Oil and water temp.

20 to 30°C [68 to 86°F]

0.15 (1.5) [21.3]

0.1 (1) [14.2] or more at idling

0.05 (0.5) [7]

Valve clearance (cold)

DI BTDC 18° ABDC 54° BBDC 66° ATDC 22° ±3° (crank angle)

Oil temperature 70 to 90°C [158 to 194°F] SC BTDC 30° ABDC 50° BBDC 74° ATDC 30° ±3° (crank angle)

0.25 [0.0098]

Bolt inlet and exhaust valves.

The timing for each model of engine varies according to its specification. Be sure to verify the timing by referring to the specifications of each model.

Fuel injection timing

V-belt deflection

Crankcase

Crankcase

Cylinder

Main bearing

Push belt inward with thumb pressure and measure deflection.

12 [0.5], approx.

Warpage of gasket contact surface

Inside diameter

94 [3.70]

0.05 [0.0020] or less

0.20 [0.0079]

94.000 to 94.035 [3.7008 to 3.7022]

94.200 [3.7087]

Circularity

0.01 [0.0004] or less

Taper

0.015 [0.0006] or less

Clearance between bearing and journal

Remark

Adjust governor setting.

0.3 to 0.5 (3 to 5) [43 to 71] at 1500 rpm

Inlet valves open Inlet valves close Exhaust valves open Exhaust valves closed

Valve timing

Repair Limit (Clearance)

According to engine specification

DI

Engine oil pressure MPa (kgf/ cm2) [psi]

General

Nominal Value

(0.050 to 0.110) ([0.0020 to 0.0043])

(0.200) ([0.0079])

Regrind if warpage is minor.

94.700 [3.7283]

–0.09 [–0.035] as journal diameter which is 78 [3.07]

Refinish cylinder to 0.25 [0.0098] or 0.50 [0.0197] oversize of normal value by honing and use the same oversize pistons and piston rings.

If repair limit is reached, replace bearings. If it is exceeded, regrind journals and use undersize bearings.

Bearing undersizes: 0.25 [0.0098] 0.50 [0.0197] 0.75 [0.0295]

MAINTENANCE STANDARDS

Inspection Point

Clearance between tappet and bore

(0.016 to 0.052) ([0.0006 to 0.0021])

1.2 [0.05]

Valve and valve guide

Inlet valve Diameter of valve stem

Clearance between guide and stem

Exhaust valve

(0.15) ([0.0059])

If it exceeds the repair limit, replace bushings. Ream if necessary.

0.05 [0.0020] or less

0.20 [0.0079]

Regrind if warpage is minor

±0.05 [±0.002] 7.940 to 7.955 [0.3126 to 0.3132]

7.900 [0.3110]

7.920 to 7.940 [0.3118 to 0.3126]

7.850 [0.3091]

(0.080 to 0.115) ([0.0032 to 0.0045])

(0.200) ([0.0079])

±0.1 [±0.004]

30° Inlet valve

Valve seat

(0.040 to 0.119) ([0.0016 to 0.0047]) (with bushings)

Exhaust valve

Angle

Exhaust valve

Width

0.4 [0.016] 0.5 [0.020] 1.4 [0.055]

Valve margin

Free length Valve spring

Cylinder head

If it exceeds the repair limit, refinish bores and install bushings, or replace camshaft.

(0.065 to 0.095) ([0.0026 to 0.0037])

11.5 [0.45]

14.100 [0.5551]

(0.15) ([0.0059])

Inlet valve

Height to top of valve guide

Valve sinkage

8 [0.31]

Remark

If it exceeds the repair limit, replace tappets.

(0.070 to 0.110) ([0.0028 to 0.0043]) (without bushings)

Warpage of gasket contact surface

Service Limit (Clearance)

(0.080) ([0.0031])

(0.070 to 0.118) ([0.0028 to 0.0047]) (without bushings)

Rear

Compressed thickness of gasket

Repair Limit (Clearance)

Squareness Set length

Set force N (kgf) [lbf]

±0.1 [±0.004]

1.0 [0.039]

±0.14 [±0.0055]

1.8 [0.071]

2.13 [0.0839]

Up to 1.83 [0.0720] by refacing

48.85 [1.92]

Se at w id th

Camshaft bore

Clearance between camshaft and journal

Assembly Standard (Standard Clearance) 14.000 to 14.018 [0.5512 to 0.5519]

Inside diameter

Front and middle

Cylinder head

Crankcase

Tappet bore

Group

Nominal Value

MAINTENANCE STANDARDS TABLE

Valve Valve margin Valve seat sinkage angle

47.60 [1.87] Squareness of ends with respect to center line

1.5° or less 43 [1.69] 176 to 196 (18 to 20) [40 to 44]

147 (15) [33]

MAINTENANCE STANDARDS TABLE

Rocker arm

Inspection Point

Inside diameter of rocker bushing

19 [0.75]

Diameter of rocker shaft Clearance between bushing and shaft

Assembly Standard (Standard Clearance)

Repair Limit (Clearance)

(0.070) ([0.0028])

0.3 [0.012] or less

Deflection

0.02 [0.0008] or less

0.05 [0.0020]

1/2 of dial indicator reading

Journal diameter

78 [3.07]

77.955 to 77.970 [3.0691 to 3.0697]

77.850 [3.0650]

Crankpin diameter

58 [2.28]

57.955 to 57.970 [2.2817 to 2.2823]

57.800 [2.2756]

Center to center distance between journal and crankpin

60 [2.36]

±0.04 [±0.0016]

77.100 [3.0354]

Runout: 0.01 [0.0004] or less (over crankpin length)

Circularity of journal and crankpin

0.01 [0.0004] or less

Taper of journal and crankpin

End play

Remark

18.980 to 19.000 [0.7472 to 0.7480]

Deflection

Fillet radius of journal and crankpin

Service Limit (Clearance)

19.010 to 19.030 [0.7484 to 0.7492]

(0.010 to 0.050) ([0.0004 to 0.0020])

Parallelism between journal and crankpin Crankshaft

Main moving parts

Valve pushrod

Cylinder head

Group

Nominal Value

MAINTENANCE STANDARDS

3 [0.12]

33 [1.30]

0.03 [0.0012]

±0.2 [±0.008]

(0.100 to 0.264) ([0.0039 to 0.0104])

(0.300) ([0.0118])

If thrust plate clearance exceeds the repair limit, replace thrust plates. If it is exceeded, use oversize thrust plates.

Thrust plate oversizes: 0.15 [0.0059] 0.30 [0.0118] 0.45 [0.0177]

MAINTENANCE STANDARDS

Outside diameter (at skirt)

Inspection Point

Piston

Group

Nominal Value

MAINTENANCE STANDARDS TABLE Assembly Standard (Standard Clearance)

Repair Limit (Clearance)

Service Limit (Clearance)

93.955 to 93.985 [3.6990 to 3.7002]

93.770 [3.6917]

94.205 to 94.235 [3.7089 to 3.7100]

94.020 [3.7016]

0.50 [0.0197] oversize

94.455 to 94.485 [3.7187 to 3.7199]

94.270 [3.7114]

DI

0.05 to 0.45 [0.0020 to 0.0177]

Standard 0.25 [0.0098] oversize

94 [3.70]

(0.000 to 0.016) ([0.0000 to 0.0006])

Piston weight difference per engine

5 g [0.18 oz] or less

Clearance between groove and ring

Clearance between piston pin and bore

Clearance between ends

Piston ring Piston pin

Check bearing clearance.

No. 1 ring

(0.150) ([0.0059])

Oil ring

4.5 [0.177]

(0.025 to 0.065) ([0.0010 to 0.0026])

(0.150) ([0.0059])

0.30 to 0.50 [0.0118 to 0.0197]

1.50 [0.0591]

No. 1, 2 rings Oil ring 30 [1.18]

30 [1.18]

Connecting rod

Rod weight difference per engine

33 [1.30]

(0.080) ([0.0032])

30.020 to 30.045 [1.1819 to 1.1829] 0.10/100 [0.0039/ 3.94] or less

Clearance between crankpin and connecting rod bearing End play

29.994 to 30.000 [1.1809 to 1.1811] (0.020 to 0.051) ([0.0008 to 0.0020])

Bend and twist

Deflection

(0.200) ([0.0079])

(0.045 to 0.085) ([0.0018 to 0.0034])

Clearance between pin and bushing

Face runout

(0.07 to 0.11) ([0.0028 to 0.0043]) 2.0 [0.079]

Diameter

Flatness

(0.050) ([0.0020])

No. 2 ring

Inside diameter of bushing

Flywheel

Main moving parts

Protrusion

Remark

0.15 [0.0059]

(0.030 to 0.090) ([0.0012 to 0.0035])

(0.200) ([0.0079])

(0.15 to 0.35) ([0.0059 to 0.0138])

(0.50) ([0.020])

Replace connecting rod.

10 g [0.35 oz] or less 0.15 [0.0059] or less

0.50 [0.020]

0.02 [0.0008] or less

0.05 [0.0020]

Straighten by cold working or replace.

MAINTENANCE STANDARDS TABLE

Group

Nominal Value

Inspection Point

+0.1

6.184 [0.2435]

6.722 [0.2647]

6.222 [0.2450]

[1.8457–0.012 ]

6.720 [0.2646]

6.220 [0.2450]

No. 1, 2

54 [2.13]

53.94 to 53.96 [2.1236 to 2.1244]

53.90 [2.1220]

No. 3

53 [2.09]

52.94 to 52.96 [2.0842 to 2.0850]

52.90 [2.0827]

5 [0.20]

(0.10 to 0.25) ([0.0039 to 0.0098])

(0.30) ([0.0118])

Replace thrust plates.

(0.009 to 0.050) ([0.0004 to 0.0020])

(0.100) ([0.0040])

Replace bushing.

(0.35) ([0.0138])

Replace thrust plates.

(0.03 to 0.18) ([0.0012 to 0.0071])

(0.25) ([0.0098])

Replace gears.

(0.20 to 0.30) ([0.0012 to 0.0018])

(0.50) ([0.0197])

Cam lift C

DI

[1.8472–0.012 ] A= 46.916 –0.3 +0.004

[1.8471–0.012 ] A= 46.878 –0.3 +0.004

[1.8456–0.012 ] +0.1

SC

Journal diameter

+0.004

+0.1

End play

A= 46.880 –0.3 +0.004

Idler gear

Clearance between shaft and bushing 30 [1.18]

(0.05 to 0.20) ([0.0020 to 0.0079])

Fit (interference) of bushing in crankcase bore

30 [1.18]

(0.035T to 0.076T) ([0.0014T to 0.0030T])

Clearance between outer rotor and case

Oil pump

C

End play

Backlash

Diameter of main shaft (case side)

16 [0.63]

15.985 to 16.000 [0.6293 to 0.6299]

Diameter of main shaft (oil pump bushing side)

14 [0.55]

13.957 to 13.975 [0.5495 to 0.5502]

A

B

Clearance between main shaft and case

(0.032 to 0.074) ([0.0013 to 0.0029])

(0.15) ([0.0059])

Replace pump case or pump assembly.

Clearance between main shaft and oil pump bushing

(0.025 to 0.111) ([0.0010 to 0.0044])

(0.200) ([0.0079])

Replace bushing or pump assembly.

Clearance between outer and inner rotors

(0.13 to 0.15) ([0.0051 to 0.0059])

(0.20) ([0.0079])

Clearance between rotors and cover

(0.04 to 0.09) ([0.0016 to 0.0035])

(0.15) ([0.0059])

Relief valve

Valve opening pressure, MPa (kgf/cm2) [psi]

Safety valve Thermostat

Remark

6.684 [0.2632]

A= 46.918 –0.3

+0.1

SC

Exhaust valve

Camshaft Timing gears

Service Limit (Clearance) 6.182 [0.2434]

Inlet valve

Lubrication system

Repair Limit (Clearance)

6.682 [0.2631]

DI

Cooling system

Assembly Standard (Standard Clearance)

MAINTENANCE STANDARDS

Replace cover or case.

0.35 ± 0.05 (3.5 ± 0.5) [50 ± 7] 1.1 (11) [156]

Temp. at which valve starts opening

76.5 ± 1.5°C [170 ± 2.7°F]

Temp. at which valve lift is more than 8 [0.3]

90°C [194°F]

With oil cooler.

MAINTENANCE STANDARDS

Group

Nominal Value

Assembly Standard (Standard Clearance)

DI

17.65 (180) [2560]

18.14 to 19.12 (185 to 195) [2632 to 2774]

DI

155°

Inspection Point

Injection nozzle

Fuel system

Valve opening pressure, MPa (kgf/cm2) [psi]

Service Limit (Clearance)

Test by means of hand tester, using diesel fuel, at 20°C [68°F]. If discharge pattern is bad even after nozzle is washed in clean diesel fuel, replace nozzle tip.

Seat shall hold a test pressure 2 MPa (20 kgf/cm2) [284 psi] lower than valve opening pressure for 10 seconds.

Wash or replace nozzle tip.

31.4 [1.24]

Runout of commutator

0.03 [0.0012]

0.1 [0.004]

Depth of commutator mold

0.4 to 0.6 [0.016 to 0.024]

Brush

Length

Spring force, N (kgf) [lbf]

Thrust clearance of pinion shaft

Pinion clearance

Remark

Make shim adjustment.

Pressure varies by 1 (10) [142] per 0.1 mm [0.004 in.] thickness of shim.

32 [1.26]

Diameter of commutator

Starter (12V - 2.2 kW)

Repair Limit (Clearance)

Spray cone angle

Oil tightness of needle valve seat

Electrical system

MAINTENANCE STANDARDS TABLE

0.2 [0.008] or less

18 [0.71]

11 [0.43]

30.4 to 38.2 (3.1 to 3.9) [6.8 to 8.6]

19.6 (2.0) [4.4]

0.5 [0.020]

0 or more

0.5 to 2.0 [0.020 to 0.079]

No-load characteristics

Locked characteristics

Magnetic switch

Voltage, V

Current, A

Speed, rpm

Voltage, V

Current, A

Torque N·m (kgf·m) [lbf·ft]

Switch-in voltage V

11

130 or less

3800 or more

3

1120 or less

31.36 (3.2) [23.1] or more

8 or less

MAINTENANCE STANDARDS TABLE

Group

Nominal Value

Inspection Point

Repair Limit (Clearance)

Runout of commutator

0.03 [0.0012]

0.1 [0.004]

Depth of commutator mold

0.4 to 0.6 [0.016 to 0.024]

Brush

Spring force, N (kgf) [lbf]

Thrust clearance of pinion shaft

Remark

0.2 [0.008] or less

17 [0.67]

11 [0.43]

33.3 to 45.1 (3.4 to 4.6) [7.5 to 10.1]

17.7 (1.8) [4.0]

0.5 [0.020]

0 or more

0.5 to 2.0 [0.020 to 0.079]

Pinion clearance

No-load characteristics

Alternator

Service Limit (Clearance) 38.1 [1.50]

Length

Starter (12V - 3 kW)

Assembly Standard (Standard Clearance)

38.7 [1.52]

Diameter of commutator

Electrical system

MAINTENANCE STANDARDS

Locked characteristics

Magnetic switch

Voltage, V

Current, A

Speed, rpm

Voltage, V

Current, A

Torque N·m (kgf·m) [lbf·ft]

Switch-in voltage V

11

180 or less

3800 or more

2

1050 or less

25.0 (2.55) [18.4] or more

8 or less

3.0 to 4.2 (310 to 430) [0.7 to 0.9]

2.1 (210) [0.5]

Brush heigth

18.5 [0.73]

7 [0.28]

Resistance in slip rings

2.4:

Brush spring force, N (gf) [lbf]

At 20°C [68°F].

MAINTENANCE STANDARDS

TIGHTENING TORQUES

Toro 30581-

TIGHTENING TORQUES

Engine Parts phone: 269 673 1638 email: EngineParts2@gmail.com

5.1

Thread Dia. x Pitch (M-thread)

Width across flats, mm

Cylinder head

M12 x 1.75

Rocker cover Rocker shaft brackets

Description

Important Bolts and Nuts Tightening Torque

Remark N·m

kgf·m

lbf·ft

19

113 to 123

11.5 to 12.5

83 to 90

M8 x 1.25

12

10.0 to 13.0

1.0 to 1.3

7.23 to 9.40

M8 x 1.25

12

10.0 to 20.0

1.0 to 2.0

7.23 to 14.5

M14 x 2

22

98 to 108

10.0 to 11.0

72 to 80

Connecting rod caps

M10 x 1.25

14

49.0 to 59.0

5.0 to 6.0

36.2 to 43.4

Flywheel

M12 x 1.25

17

78.5 to 88.3

8.0 to 9.0

57.9 to 65.1

Camshaft thrust plate

M8 x 1.25

12

10.0 to 13.0

1.0 to 1.3

7.23 to 9.40

Front plate

M8 x 1.25

12

10.0 to 13.0

1.0 to 1.3

7.23 to 9.40

Timing gear case

M8 x 1.25

12

10.0 to 13.0

1.0 to 1.3

7.23 to 9.40

Crankshaft pulley

M30 x 1.5

46

480 to 500

49 to 51

354 to 369

Idler gear thrust plate

M10 x 1.25

14

29.0 to 39.0

3.0 to 4.0

21.7 to 28.9

Oil pan

M8 x 1.25

12

10.0 to 13.0

1.0 to 1.3

7.23 to 9.40

Press RLO SDQ

Oil pan

M8 x 1.25

12

27.5 to 33.4

2.8 to 3.4

20.3 to 24.6

Cast oil pan

Rear plate

M10 x 1.25

14

54.0 to 65.7

5.5 to 6.7

39.8 to 48.5

Oil pan drain plug

M14 x 1.5 M20 x 1.5

22 24

34.0 to 44.0 73.0 to 83.0

3.5 to 4.5 7.5 to 8.5

25.3 to 32.5 54.2 to 61.5

Fuel injection nozzle glands (direct injection type)

M8 x 1.25

12

21.0 to 23.0

2.0 to 2.4

14.5 to 17.4

22

34.0 to 39.0

3.5 to 4.0

25.3 to 28.9

Main bearing caps

Fuel injection pump delivery valve holders Fuel leak-off pipe nut

M12 x 1.5

17

20.6 to 24.5

2.1 to 2.5

15.2 to 18.1

Fuel injection pump gear (distribution type)

M14 x 1.5

22

76.5 to 86.3

7.8 to 8.8

56.4 to 63.7

M14 x 1.5

22

83.4 to 98.0

8.5 to 10.0

61.5 to 72.3

M12 x 1.25 M4 x 0.7

12 8

20.0 to 30.0 2.0 to 3.0 14.5 to 21.7 1.0 to 1.5 0.10 to 0.15 0.72 to 1.08

Exhaust Manifold (bolt only) (with spacer)

M8 x 1.25 M8 x 1.25

12 12

27.5 to 33.3 15.0 to 22.0

2.8 to 3.4 1.5 to 2.2

20.3 to 24.6 10.8 to 15.9

Oil pressure relief valve

M22 x 1.5

27

44.1 to 53.9

4.5 to 5.5

32.5 to 39.8

M18 x 2

24

64.0 to 74.0

6.5 to 7.5

47.0 to 54.2

1/4 – 18NPTF

14

35.3 to 43.1

3.6 to 4.4

26.0 to 31.8

Fuel injection pump gear (in-line, direct injection type)

Glow plug (direct injection type) (terminal)

Safety valve or blind plug Coolant drain plug

TIGHTENING TORQUES

MAINTENANCE STANDARDS Thread Dia. x Pitch (M-thread)

Width across flats, mm

Fuel injection pipe nuts

M12 x 1.5

Fuel return pipe nuts

Description

Tightening Torque

Remark N·m

kgf·m

lbf·ft

19

26.5 to 32.4

2.7 to 3.3

19.5 to 23.9

M10 x 1.25

14

17.7 to 21.6

1.8 to 2.2

13.0 to 15.9

Oil pump gear

M10 x 1.25

14

28.0 to 38.0

2.9 to 3.9

21.0 to 28.2

Overheat warning unit (thermoswitch)

M16 x 1.5

19

20.6 to 24.5

2.1 to 2.5

15.2 to 18.1

Starter terminal B

M8 x 1.25

12

9.81 to 11.8

1.0 to 1.2

7.23 to 8.68

Plug

M16 x 1.5

24

39.2 to 49.0

4.0 to 5.0

28.9 to 36.2

Balancer

M8 x 1.25

12

27.5 to 33.4

2.8 to 3.4

20.3 to 24.6

Fuel injection pump feed pipe (flare)

M12 x 1.0

17

16.0 to 23.0

1.6 to 2.3

11.6 to 16.6

Fuel injection pump eye bolt

M14 x 1.5

22

15.0 to 20.0

1.5 to 2.0

10.8 to 14.5

17

15.0 to 20.0

1.5 to 2.0

10.8 to 14.5

24

49.0 to 58.8

5.0 to 6.0

36.2 to 43.4

Fuel injection pump overflow valve Oil level sensor

1 – 1/ 16 – 12

5.2

Cylinder head

Standard Bolts Torque

Thread Diameter (mm)

4T

7T

N·m

kgf·m

lbf·ft

N·m

kgf·m

lbf·ft

M6

2.94 to 4.90

0.3 to 0.5

2.17 to 3.62

7.89 to 9.80

0.8 to 1.0

5.79 to 7.23

M8

9.80 to 12.7

1.0 to 1.3

7.23 to 9.40

14.7 to 21.6

1.5 to 2.2

10.8 to 15.9

M10

17.7 to 24.5

1.8 to 2.5

13.0 to 18.1

29.4 to 41.2

3.0 to 4.2

21.7 to 30.4

M12

29.4 to 41.2

3.0 to 4.2

21.7 to 30.4

53.9 to 73.5

5.5 to 7.5

39.8 to 54.2

5.3

Standard Studs Torque (tap end)

Thread Diameter (mm)

For driving in aluminum materials

For driving in ferrous materials

N·m

kgf·m

lbf·ft

N·m

kgf·m

lbf·ft

M8

4.90 to 5.90

0.50 to 0.60

3.62 to 4.34

11.8 to 13.7

1.2 to 1.4

8.68 to 10.1

M10

12.7 to 14.7

1.3 to 1.5

9.40 to 10.8

21.6 to 25.5

2.2 to 2.6

15.9 to 18.8

MAINTENANCE STANDARDS

TIGHTENING TORQUES 5.4

Standard Plugs Torque

Thread Diameter

For aluminum materials

For ferrous materials

N·m

kgf·m

lbf·ft

N·m

kgf·m

lbf·ft

NPTF 1/16

4.90 to 7.85

0.5 to 0.8

3.62 to 5.79

7.85 to 11.8

0.8 to 1.2

5.79 to 8.68

PT 1/8

7.85 to 11.8

0.8 to 1.2

5.79 to 8.68

14.7 to 21.6

1.5 to 2.2

10.8 to 15.9

PT 1/4, NPTF 1/4

19.6 to 29.4

2.0 to 3.0

14.5 to 21.7

34.3 to 44.1

3.5 to 4.5

25.3 to 32.5

__

__

__

53.9 to 73.5

5.5 to 7.5

39.8 to 54.2

PT 3/8

Remarks: 1.

2.

The torque values shown above are for the bolts with spring washers.

Do not apply any oil to the bolt threads.

SEALANTS AND LUBRICANTS TABLE

MAINTENANCE STANDARDS MAINTENANCE STANDARDS

6

Apply to

Mating part

SEALANTS AND LUBRICANTS TABLE

Sealant or Lubricant

How to Use

Oil pan

Crankcase

Three Bond 1207C

Apply to seal.

Rear bearing cap seat on crankcase

Rear bearing cap

Three Bond 1212

Apply to corners before installing cap.

Side seals

Crankcase rear bearing cap

Three Bond 1212

Apply to side seals.

Cylinder head coolant hole plug

Cylinder head

Three Bond 1386D

Apply to plug hole.

Crankcase coolant hole plug

Crankcase

Three Bond 1386D

Apply to plug hole.

Crankcase oil hole plug

Crankcase

Three Bond 1386D

Apply to plug hole.

Return oil hole blind plug or pipe of crankcase

Crankcase

Three Bond 1344

Apply to blind plug or pipe.

Crankshaft threads

Crankshaft pulley nut

Three Bond 1212

Apply to crankshaft thread before tightening nut.

DETERMINATION OF OVERHAUL TIMING

OVERHAUL INSTRUCTIONS

OVERHAUL INSTRUCTIONS

8

DETERMINATION OF OVERHAUL TIMING

In most cases the engine should be overhauled when the engine’s compression pressure is low. Other factors that indicate the necessity of engine overhaul are as follows: 1.

Decreased power

2.

Increased fuel consumption

3.

Increased engine oil consumption

4.

Increased blow-by gas volume through the breather due to abrasion at the cylinder liner and the piston ring

5.

Gas leakage due to poor seating of the inlet and the exhaust valves

6.

Starting problems

7.

Increased noise from engine parts

8.

Abnormal color of exhaust gas from engine after warm-up

Any one or a combination of these symptoms may indicate that engine overhaul is required. Of the items listed above some are not directly related to the necessity of engine overhaul. Items (2) and (6) are more likely to be affected substantially by • • • • •

Injection volume of the fuel injection pump Fuel injection timing Wear of injection-pump plunger Fitting of the injection nozzle Condition of electrical equipment: battery, starter, or alternator

Item (4) above, however, requires special consideration because decreased pressure due to wear at the cylinder liner and the piston ring is one of the most obvious signs that the engine requires overhauling.

The most effective way to make a decision is by testing the compression pressure; other factors are to be considered secondarily.

OVERHAUL INSTRUCTIONS

TESTING THE COMPRESSION PRESSURE OVERHAUL INSTRUCTIONS

9

Figure 1

TESTING THE COMPRESSION PRESSURE

Remove the injection nozzle from the cylinder head where the compression pressure is to be measured.

On the direct injection type engine, attach gage adaptor to the cylinder, and connect the compression gage to the adaptor.

3.

Crank the engine by means of the starter, with the governor stop lever pulled (the fuel supply shut off), and read the compression gage indication when the engine running at the specified speed.

4.

If the compression pressure is lower than the repair limit, overhaul the engine.

Measuring compression pressure (direct injection pump)

CAUTION a. Measure the compression pressure on all cylinders. It is not a good practice to measure the compression pressure on only few cylinders, and presume the compression on the remaining cylinders. b. Compression pressure varies with engine speed. Check engine speed when measuring the compression pressure.

Unit: MPa (kgf/cm2) [psi] Item

Compression pressure

Assembly Standard

Service Limit

2.9 (30) [427]

2.6 (27) [384]

TESTING THE COMPRESSION PRESSURE

OVERHAUL INSTRUCTIONS

รณ

NOTE Measure the compression pressure with the engine running at 300 rpm.

CAUTION a. Measure the compression pressure at regular intervals to obtain correct data. b. The compression pressure will be slightly higher in a new or overhauled engine due to new piston rings, valve seats, etc.

Pressure will drop gradually by the wear of parts.

ADJUSTMENTS, BENCH TEST, PERFORMANCE TESTS

ADJUSTMENTS

ADJUSTMENTS, BENCH TEST, PERFORMANCE TESTS

10 ADJUSTMENTS 10.1 Valve Clearance Valve clearance should be inspected and adjusted when the engine is cold.

Unit: mm [in.]

Item Valve clearance (cold setting)

1.

Assembly Standard Inlet 0.25 [0.0098] Exhaust

Inspection 1)

Inspect the valve clearance in the injection sequence. To check, turn the crankshaft by the specified crank angle in the normal direction to bring the piston to the top dead center of the compression stroke.

Injection sequence 1-3-4-2

2)

4) Crankshaft pulley

Figure 3

Checking valve clearance (turning)

180°

Put socket and ratchet handle on the crankshaft pulley nut and turn the crankshaft in the normal direction (clockwise as seen from the front end).

Unit: mm [in.]

Width across flats of crankshaft pulley nut

3)

Crank angle

46 [1.81]

The top dead center on compression stroke of No.1 piston is identified by the timing mark “0” (on the crankshaft pulley) being aligned with the pointer on the gear case. With the piston so positioned, both the inlet and exhaust valve rocker arms are not being pushed up by their pushrods.

Insert a feeler gage in between the rocker arm and valve cap, and check the clearance.

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS

Unit: mm [in.]

Nominal Value

Item Inside diameter of rocker bushings

19 [0.75]

Assembly Standard

Repair Limit

19.010 to 19.030 [0.7484 to 0.7492]

Diameter of rocker shaft

18.980 to 19.000 [0.7472 to 0.7480]

Clearance between rocker bushing and shaft

0.010 to 0.050 [0.0004 to 0.0020]

0.070 [0.0028]

16.2.2 Valves, valve guides and valve seats Measuring diagram

1.

Measuring valve stem Measure the diameter of the valve stem as shown in the illustration. If the stem is worn beyond the service limit or unevenly worn excessively, replace the valve.

Unit: mm [in.]

Item

Figure 40

Measuring valve stem

Inlet valve Diameter of valve stem

8 [0.31] Exhaust valve

2.

Measuring diagram

Figure 41

Measuring valve guide

Nominal Value

Assembly Standard

Service Limit

7.940 to 7.955 [0.3126 to 0.3132]

7.900 [0.3110]

7.920 to 7.940 [0.3118 to 0.3126]

7.850 [0.3091]

Checking clearance between valve stem and valve guide The valve guide wears more rapidly at its both ends than at any other parts. Measure the inside diameter of the guide at its ends as shown in the illustration to determine the clearance between the guide and stem. If clearance exceeds the service limit, replace the valve or guide whichever is excessively worn.

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS Unit: mm [in.]

Item

Clearance between valve stem and guide

Inlet valve

Exhaust valve

Height to top of valve guide

Valve guide remover

Figure 42

Nominal Value

Assembly Standard

Repair Limit

__

0.065 to 0.095 [0.0026 to 0.0037]

0.150 [0.0059]

__

0.080 to 0.115 [0.0032 to 0.0045]

0.200 [0.0079]

11.5 [0.45]

Âą0.1 [Âą0.004]

Replacing valve guide

Use the valve guide remover to remove the valve guide for replacement.

2)

To install a replacement guide, use valve guide installer

Removing valve guide

Press

Valve guide installer

CAUTION 11.5 mm [0.45 in.]

Figure 43

Installing valve guide

The installation depth for the valve guide is specified; be sure to use the valve guide installer to insure the correct depth.

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS 4.

Inspecting valve face Coat the valve face lightly with red lead. Use the Valve lapper to inspect the valve contacts with its seat. If the contact is not uniform, or if the valve is defective or if the service limit is exceeded, repair or replace the valve and valve seat.

Valve lapper

Red lead

Figure 44

Inspecting valve face

NOTE

Good

Figure 45

a. Inspect the valve face after the inspection or replacement of the valve guide. b. Do not rotate the valve when checking its contact. c. After refacing or replacing the valve or the valve seat, be sure to lap the valve in the seat. (See (8) Valve lapping.)

Bad

Valve contact pattern Unit: mm [in.]

Item

Valve seat width

Valve seat angle Valve margin Valve sinkage

Valve seat

Angle Inlet valve Valve sinkage Exhaust valve

Width

Figure 46 Valve margin

Assembly Standard

Repair Limit

30°

__

0.4 ± 0.1 [0.016 ± 0.004] (inlet) 0.5 ± 0.1 [0.020 ± 0.004] (exhaust)

1.0 [0.039]

1.4 ± 0.14 [0.055 ± 0.0055]

1.8 [0.071]

2.13 [0.0839]

Up to 1.83 [0.0720] by refacing

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS 5.

S

Refacing valve face If the valve face is badly worn, reface it with a valve refacer.

NOTE a. Set a valve refacer to an angle of 30° b. The valve has a stellate facing. This facing will be gone if the valve margin exceeds the service limit. If the margin seems to be less than the service limit when ground, replace the valve.

Figure 47

Refacing valve face 6.

S

Refacing valve seat Use the Valve seat cutter or valve seat grinder to reface the valve seat. After refacing, grind the seat lightly using #400 grade sandpaper inserted between the cutter and valve seat.

Valve seat cutter

NOTE a. Cut or grind the valve seat only as needed for refacing. b. Replace the valve seat if the seat width is more than the repair limit as a result of wear or cutting.

Figure 48

Refacing valve seat 7.

Replacing valve seat 1)

Welt

Weld a stud to the valve seat. Insert a shaft into the valve guide holder from the upper side of the cylinder head. Drive the seat off from the cylinder head as shown.

Shaft Valve seat

NOTE When you weld the stud, do not to permit splatter to come in contact with the machined surfaces of cylinder head.

Stud

Figure 49

Removing valve seat

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS

Figure 50

2)

Before installing replacement valve seats in the cylinder head, measure the bores in the cylinder head for the valve seats.

3)

Chill the valve seat in liquid nitrogen of – 170°C [–274°F] for more than 4 minutes with the cylinder head kept at normal temperature, or heat the cylinder head up to 80°C to 100°C [176°F to 212°F] with the valve seat chilled in ether or alcohol containing dry ice.

4)

Using insert caulking tool, drive the seat into position.

8 ± 0.1 [0.315 ± 0.004]

2 ± 0.1 [0.079 ± 0.004]

2 ± 0.1 [0.079 ± 0.004]

8 ± 0.1 [0.315 ± 0.004]

Unit: mm [in.]

46+0.0025 0

37+0.0025 0

[1.811+0.00098 ] 0

[1.457+0.00098 ] 0

Inlet valve seat bore

Exhaust valve seat bore

Valve seat dimensions

Insert caulking tool

Figure 51

Installing valve seat 8.

Lapping valve in valve seat Be sure to lap the valve in the valve seat after the valve or the seat have been replaced.

1)

Compound

Figure 52

Coating valve with lapping compound

Coat the valve face lightly with a lapping compound.

NOTE a. Do not permit the compound to come in contact with the valve stem. b. Use a compound of 120 to 150 mesh for initial lapping and the compound finer than 200 mesh for finish lapping. c. Mixing the compound with a small amount of engine oil will facilitate coating.

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS 2)

Using lapping tool, hold the valve against the seat and rotate it only a part of a turn, then raise the valve off the seat, rotating it to a new position. Then press the valve against the seat for another part of a turn. Repeat this operation until the compound wears and loses it cutting particle.

3)

Wash off the compound with diesel fuel.

4)

Apply the valve face to the engine oil, and again lap the valve.

5)

Check the valve face for contact.

Valve lapping tool

Figure 53

Lapping valve in valve set 9.

Perpendicularity

Measuring valve spring perpendicularity and free length Measure the free length and perpendicularity of each valve spring. If the free length or perpendicularity exceeds the service limit, replace the spring.

Unit: mm [in.]

Free length

Assembly Standard

Service Limit

Free length

48.85 [1.92]

47.60 [1.87]

Perpendicularity

1.5° or less

__

43 [1.69]

__

176 to 196 (18-20) [40 to 44]

147 (15) [33]

Item

Figure 54

Measuring valve spring perpendicularity and free length

Set length Set force N (kgf) [lbf]

10. Measuring cylinder head warpage Using a heavy accurate straight edge and feeler gages, check the gasket contact surface for warpage in two positions lengthwise, two crosswise and two widthwise as shown in the illustration. If the warpage exceeds the repair limit, reface the head with a surface grinder.

Unit: mm [in.]

Item Warpage of gasket contact surface

Assembly Standard

Repair Limit

0.05 [0.0020] or less

0.20 [0.0079]

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS

11. Measuring valve pushrod deflection Measure the pushrod deflection with a V-block and a dial indicator as shown in the illustration. If the dial indicator reading exceeds the assembly standard, replace the pushrod.

Unit: mm [in.]

Item

Assembly Standard

Deflection (dial indicator reading) of valve pushrod

Figure 56

0.3 [0.012] or less

Measuring valve pushrod deflection

16.3 Reassembly 1.

After installing the valve in position, install the seal to the valve guide with stem seal installer

Valve

Stem seal installer

Installing valve stem seal

Valve stem seal

CAUTION

Valve guide

Figure 57

a. Do not put any oil or sealant on the face of the stem seal that comes in contact with the valve guide. When installing the seal, put engine oil on the seal contact surface of the stem to ensure initial lubrication of the stem seal lip. b. Do not remove the valve after the seal has been installed in position to prevent damage to the seal lip.

Installing valve stem seal

Valve spring pusher

Installing valve and valve spring

Figure 58

Put the valve spring and retainer on the valve guide. Using valve spring pusher compress the valve spring and install the valve cotters.

Installing valve and valve spring Toro 30581- Engine Parts contact phone: 269 673 1638 email: EngineParts@HeavyEquipmentRestorationParts.com

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS 2)

Figure 59

Tap the valve stem top with a soft-faced hammer several times to make sure the valve spring and cotters are properly installed.

Installing valve cotters 3.

Installing cylinder head 1) 2)

Dowel pin

Put the gasket on the top of the crankcase, making sure the two dowel pins enter their holes in the gasket.

Put the cylinder head on the crankcase, making sure the two dowel pins enter their holes in the head. Tighten the head bolts.

CAUTION

Dowel pin

Do not use any sealant. Make sure the gasket contact surface of the crankcase is free from any defects.

Figure 60

Installing cylinder head 3)

Tighten the cylinder head bolts to the specified torque in the sequence shown in the illustration.

Tightening torque for cylinder head bolts

Front

No. of bolts: 17

Figure 61

Cylinder head bolt tightening sequence

Toro 30581- Engine Parts contact phone: 269 673 1638 email: EngineParts@HeavyEquipmentRestorationParts.com com

113 to 123 N·m (11.5 to 12.5 kgf·m) [83 to 90 lbf·ft]

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS

4.

Reassembling rocker shafts After reassembling the rocker shafts, make sure the rocker arms move smoothly.

Figure 63

Reassembling rocker shafts 5.

Installing rocker shaft assembly 1)

Install the valve caps in position.

2)

Put the rocket shaft assembly on the cylinder head and tighten the bolts to the specified torque.

Long bolt

Tightening torque for rocker shaft bolts

Figure 64

Installing rocker shaft assembly

10.0 to 20.0 N·m (1.0 to 2.0 kgf·m) [7.23 to 14.5 lbf·ft]

CYLINDER HEADS AND VALVE MECHANISM

ENGINE MAIN PARTS 6.

Adjusting valve clearance

Refer to 1.1, Group 5.

Figure 65

Adjusting valve clearance

DAMPER, TIMING GEARS AND CAMSHAFT

ENGINE MAIN PARTS 6.

Inspecting and adjusting after reassembly Timing gear backlash and end play After installing the timing gears, check the backlash and end play and, if necessary, adjust them. (Refer to 3.2.)

Figure 102 Inspecting backlash and end play 7.

Top dead center

Inlet valve

Exhaust valve

Inspecting valve timing It is not necessary to inspect the valve timing, provided that all match marks on the timing gears are aligned. Inspect the timing for verification as explained below: 1)

Rotation

2) 3)

Bottom dead center

Figure 103 Valve timing diagram (direct injection type) 4) Top dead center

Exhaust valve

Inlet valve

Rotation

Bottom dead center

Figure 104 Valve timing diagram with 3 mm [0.12 in.] clearance added (direct injection type)

Using a 3 mm [0.12 in.] thick smooth steel plate, add 3 mm [0.12 in.] clearance to the inlet and exhaust valves of the No.1 cylinder.

Put a 0.05 mm [0.0020 in.] feeler gage between the top of the valve cap and the rocker.

Slowly turn the crankshaft to find a position where the feeler gage is firmly gripped (the valve starts opening) and a position where the gage is just ungripped (the valve starts closing).

Check to make sure these positions agree with the angular positions shown in the valve timing diagram with 3 mm [0.12 in.] clearance added to the valves.

DAMPER, TIMING GEARS AND CAMSHAFT

ENGINE MAIN PARTS 9.

Installing timing gear case 1) 2) 3)

Put the gasket on the front plate, making sure the dowels enter their holes in the gasket.

Apply oil to the lip of the oil seal.

Tighten the bolts that hold the timing gear case to the specified torque.

Tightening torque for timing gear case bolts

10.0 to 13.0 N·m (1.0 to 1.3 kgf·m) [7.23 to 9.40 lbf·ft]

Figure 108 Installing timing gear case 10. Installing oil pan Put Three Bond 1207C along heavy line

1) 2) 3) 4)

Clean the mounting surfaces of the crankcase, timing gear case and oil pan.

Squeeze out a 4 mm [0.2 in.] thickness of Three Bond 1207C (32A91–05100) from the tube and put it on the oil pan flange.

Install the oil pan to the crankcase within 5 minutes after putting Three Bond 1207C. Tighten the bolts to the specified torque.

Tightening torque for oil pan bolts

10.0 to 13.0 N·m (1.0 to 1.3 kgf·m) [7.23 to 9.40 lbf·ft]

Figure 109 Oil pan flange to be coated with Three Bond 1207C

NOTE Cut nozzle here

Figure 110 Nozzle for Three Bond 1207C tube

To squeeze out a 4 mm [0.2 in.] thickness of Three Bond, cut the first node of the nozzle.

ENGINE MAIN PARTS

DAMPER, TIMING GEARS AND CAMSHAFT 11. Installing crankshaft pulley Install two safety bars (M12 x 1.25) to the rear end of the crankshaft. Put a bar between the safety bars to hold the crankshaft. Under this condition, install the crankshaft pulley and tighten the nut to the specified torque.

Tightening torque for crankshaft pulley nut

Figure 111

Installing crankshaft pulley

480 to 500 N·m (49 to 51 kgf·m) [354 to 369 lbf·ft]

WARNING Be on standby to act when the safety bar comes off inadvertently.

12. Installing damper Hold the crankshaft with safety bars and install the damper.

Figure 112 Installing damper

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS Measuring diagram

2.

Inside diameter of cylinders

Unit: mm [in.]

1)

Measure the inside diameter of the cylinder at the top (ridged portion), middle and bottom, each in two directions parallel and transverse to the crankshaft, as shown in the illustration.

150 [5.91]

11 [0.43] 80 [3.15]

ENGINE MAIN PARTS

Figure 122 Measuring cylinder

Unit: mm [in.]

Item

Assembly Standard

Repair Limit

Service Limit

Inside diameter of cylinder

94.000 to 94.035 [3.7008 to 3.7022]

94.200 [3.7087]

94.700 [3.7283]

Circularity

0.01 [0.004] or less

Taper

0.015 [0.0006] or less

2)

3) 4)

If the cylinder has reached the repair limit, with the wear far less than the service limit, bore it to 0.25 mm [0.0098 in.] or 0.5 mm [0.0197 in.] oversize.

Hone the cylinder within an accuracy of 0.035 mm [0.00138 in.], and use the piston and piston rings of the same oversize.

If any cylinder is unevenly worn, determine the oversize on the basis of the maximum wear noted to ensure perfect roundness in the oversized bore.

NOTE a. Refinish all cylinders to the same oversize. b. If the cylinder is found in good condition, with the wear far less than the repair limit, replace the piston ring and ream off “ridge� at the top of the cylinder. Hone the bore if necessary.

Figure 123 Ridge-reaming cylinder

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS

ENGINE MAIN PARTS

Measuring diagram

19.2.2 Pistons and piston rings 1.

Measuring piston diameter 1)

Measure the diameter of the piston at skirt in the direction transverse to the piston pin with a micrometer, as shown in the illustration. If the piston is worn beyond the service limit, replace it.

Unit: mm [in.]

Assembly Standard

Service Limit

Standard

93.955 to 93.985 [3.6990 to 3.7002]

93.770 [3.6917]

0.25 [0.0098] oversize

94.205 to 94.235 [3.7089 to 3.7100]

94.020 [3.7016]

0.50 [0.0197] oversize

94.455 to 94.485 [3.7187 to 3.7199]

94.270 [3.7114]

5 g [0.18 oz] or less

WS

Item

Outside diameters of pistons

Figure 124 Measuring piston diameter

Piston weight difference per engine

2)

WEIGHT mark FRONT mark

Figure 125 FRONT mark and WEIGHT mark on piston (direct injection type)

When installing the piston, make sure the weight difference of the piston per engine is in the assembly standard.

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 2.

ENGINE MAIN PARTS

Measuring cut clearance between ends of piston ring Put the piston ring in the gage or a new cylinder sleeve and measure the cut clearance with feeler gages as shown in the illustration. If the clearance exceeds the service limit, replace all piston rings.

38 Inside diameter of gage: 94+0.035 [3.70+0.001 ] 0 0

NOTE Figure 127 Measuring cut clearance between ends of piston ring

Use the piston to put the ring in the gage or the cylinder sleeve squarely.

Unit: mm [in.]

Cut clearance

Item

3.

No. 1 and No. 2 rings

Assembly Standard

Service Limit

0.30 to 0.50 [0.0118 to 0.0197]

150 [0.0591]

Oil ring

Measuring clearance between groove and piston ring Put a new piston ring in the groove. Measure the clearance between the groove and piston ring with a straight edge and feeler gages as shown in the illustration. If the clearance exceeds the service limit, replace the piston.

Unit: mm [in.]

Assembly Standard

Service Limit

No. 1 rings

0.07 to 0.11 [0.0028 to 0.0043]

0.200 [0.0079]

No. 2 rings

0.045 to 0.085 [0.0018 to 0.0034]

0.150 [0.0059]

Oil ring

0.025 to 0.065 [0.0010 to 0.0026]

0.150 [0.0059]

Figure 128 Measuring clearance between groove and piston ring

Clearance between groove and piston ring

Item

ENGINE MAIN PARTS

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 4.

Measuring clearance between piston pin and bore Measure the inside diameter of the piston pin bore and the diameter of the pin as shown in the illustration to check the clearance between the piston and pin. If the clearance exceeds the service limit, replace the pin or piston whichever is excessively worn.

Measuring diagram

Unit: mm [in.]

Item Figure 129 Measuring clearance between piston pin and bore

Nominal Value

Assembly Standard

30 [1.18]

29.994 to 30.000 [1.1809 to 1.1811]

Diameter of piston ring Clearance between piston pin and bore

5.

0.000 to 0.016 [0.0000 to 0.0006]

Service Limit

0.050 [0.0020]

Measuring piston protrusion If the piston protrusion is not correct, check the various parts for clearance. Measure the piston protrusion as outlined below.

1) 2) 3)

Figure 130 Measuring piston protrusion

Measure the top dead center of the pistons with a dial gage.

Install the dial indicator on the top of the crankcase. Set the indicator to read 0.0 mm [0.000 in.].

Measure the piston protrusion at least three locations on the top of the piston and average the three measurements to check the protrusion. Subtract the projection from the compressed thickness of the cylinder head gasket to check the clearance between the piston top and the cylinder head.

Unit: mm [in.]

Assembly Standard

Item Direct injection

0.05 to 0.45 [0.0020 to 0.0177]

Piston protrusion

Compressed thickness of cylinder head gasket

1.2 Âą 0.05 [0.05 Âą 0.002]

CAUTION Incorrect piston protrusion affects engine performance and causes valve interference with the piston.

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS

Measuring diagram

49.0 to 59.0 N·m (5.0 to 6.0 kgf·m) [36.2 to 43.4 lbf·ft]

ENGINE MAIN PARTS

19.2.3 Connecting rods, connection rod bearings and piston pin bushings 1.

Clearance between connecting rod bearing and crankpin Measure the diameter of the crankpin and the inside diameter of the connecting rod bearing as shown in the illustration to check the clearance between the two. If the clearance exceeds the service limit, replace the bearing. If the crankpin is badly or unevenly worn, grind the crankpin and use an undersize bearing.

Figure 131 Measuring connecting rod bearing

NOTE To measure the inside diameter of the connecting rod bearing, install the upper and lower halves in the connecting rod and tighten the cap bolts to the specified torque.

Unit: mm [in.]

Item

Diameter of crankpin Clearance between connecting rod bearing and crankpin

2.

Measuring diagram

Nominal Value

Assembly Standard

Service Limit

58 [2.28]

57.955 to 57.970 [2.2817 to 2.2823]

57.800 [2.2756] (Repair Limit)

0.030 to 0.090 [0.0012 to 0.0035]

0.200 [0.0079]

Clearance between connecting rod bushing and piston pin Measure the inside diameter of the connecting rod bushing and the diameter of the piston pin as shown in the illustration to check the clearance between the two. If the clearance exceeds the service limit, replace the pin or bushing whichever is badly worn.

Toro 30581- Engine Parts contact phone: 269 673 1638 email: EngineParts@HeavyEquipmentRestorationParts.com Figure 132 Measuring connecting rod bushing

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS

ENGINE MAIN PARTS

Unit: mm [in.]

Item Inside diameter of connecting rod bush Clearance between pin and bushing

Assembly Standard

30 [1.18]

30.020 to 30.045 [1.1819 to 1.1829] 0.020 to 0.051 [0.0008 to 0.0020]

Service Limit

0.080 [0.0032]

Installing connecting rod bushing

Matching mark

Nominal Value

Oil hole

Use connecting rod bushing puller to install the connecting rod bushing.

When installing a new bushing, align the oil holes in the bushing and connecting rod.

Position the ends of the bushing as shown in the illustration.

After installing the bushing, put the piston pin in position and make sure the pin rotates freely.

Ends of bushing

Figure 133 Installing connecting rod bushing 4.

Unit: mm [in.]

Piston pin

C 0.10 [0.0039] ---- ----------------------------------100 [3.94]

Inspecting connecting rods for bend and twist 1)

Measure C and . If the measurement at C is more than 0.10 mm [0.0039 in.] per 100 mm [3.94 in.] of , straighten the rod with a press.

Unit: mm [in.]

C 0.10 [0.0039] ---- ----------------------------------100 [3.94] Twist Bend

Item Bent or twisting of connecting rod

Assembly Standard

Repair Limit

0.10/100 [0.0039/3.94] or less

0.15 [0.0059]

Figure 134 Measuring connecting rod bend and twist 2)

A connecting rod aligner is generally used for checking the connecting rod bend and twist.

NOTE To check for bending, install the bearing cap to the connecting rod and tighten the cap nuts to the 49.0 to 59.0 N·m (5.0 to 6.0 kgf·m) [36.2 to 43.4 lbf·ft].

Figure 135 Checking connecting rod on a connecting rod aligner

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 3)

ENGINE MAIN PARTS To check the rod complete with the piston, put the piston on the surface plate, put a round bar identical with the crankpin in diameter in the big end bore and measure the heights A and B of the bar with a dial indicator.

Figure 136 Measuring connecting rod 5.

Inspecting connecting rod bearings Check each bearing for flaking of overlay, scratching, burning, pitting or other defects.

Replace defective bearings if any.

Flaking of overlay

Scratching

Failure due to poor seating

Figure 137 Checking connecting rod bearings 6.

Measuring connecting rod end play Install the connecting rod to the mating crankpin by tightening the cap nuts to the specified torque.

Measure the end play (clearance between the rod and crank arm) with feeler gages as shown in the illustration. If the end play exceeds the service limit, replace the connecting rod.

Unit: mm [in.]

Figure 138 Measuring connecting rod end play

Item

Assembly Standard

Service Limit

End play of connecting rod

0.15 to 0.35 [0.0059 to 0.0138]

0.50 [0.020]

ENGINE MAIN PARTS

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 7.

Matching mark

Weight difference between connecting rod assemblies When installing the connecting rod, make sure the weight difference of the connecting rod per engine is in the assembly standard.

Unit: mm [in.]

Assembly Standard

Item Weight mark Connecting rod weight difference per engine

10 g. [0.35 oz.] or less

19.2.4 Crankshaft Measuring diagram

1.

Measuring journal diameter Measure the journal with a micrometer as shown in the illustration to check wear, circularity, taper and clearance between the bearing and journal. If any measurement exceeds the repair limit, grind the crankshaft to an undersize. If it exceeds the service limit, replace the crankshaft.

Unit: mm [in.]

Item

Figure 139 Measuring journals

Journal diameter

Nominal Assembly Repair Service Value Standard Limit Limit 78 [3.07]

Circularity Taper

2.

77.955 to 77.970 [3.0691 to 3.0697]

77.850 [3.0650]

0.01 [0.0004] or less

0.03 [0.0012]

77.100 [3.0354]

Measuring crankpin diameter

Measuring diagram

Measure the crankpin with a micrometer as shown in the illustration to check wear, circularity, taper and clearance between the bearing and crankpin.

If any measurement exceeds the repair limit, grind the crankshaft to an undersize, or replace the crankshaft.

Unit: mm [in.]

Item Figure 140 Measuring crankpins

Crankpin diameter Circularity Taper

Nominal Value

Assembly Standard

Service Limit

58 [2.28]

57.955 to 59.970 [2.2817 to 2.2823]

57.800 [2.2756]

0.01 [0.0004] or less

0.03 [0.0012]

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 3.

ENGINE MAIN PARTS

Grinding crankshaft When grinding the crankpins and journals, be sure to produce the same fillet radius as the original one. They should have a hardness of 620 or more in terms of Vickers Hardness Number. If necessary, re-harden the crankpins and journals, and inspect them for cracks by conducting a magnalux (magnetic particle) test.

Crankshaft grinding dimensions Unit: mm [in.]

Undersize

Grinding dimension

0.25 [0.0098]

77.705 to 77.720 [3.0593 to 3.0598]

0.50 [0.0197]

77.455 to 77.470 [3.0494 to 3.0500]

0.75 [0.0295]

77.205 to 77.220 [3.0396 to 3.0402]

0.25 [0.0098]

57.705 to 57.720 [2.2719 to 2.2724]

0.50 [0.0197]

57.455 to 57.470 [2.2620 to 2.2626]

0.75 [0.0295]

57.205 to 57.220 [2.2522 to 2.2528]

Journal

Crankpin

4.

31+0.039 mm 0 54 [1.22+0.001 0

in.]

Measuring crankshaft end play 1)

2)

Figure 141 Measuring crankshaft end play

With the thrust plates installed in the front and rear journals and all bearing caps tightened to the specified torque, measure the end play (the difference in width between the journal and thrust plate). If the end play exceeds the repair limit, replace the thrust plate.

If the end play still exceeds the repair limit even after the new thrust plates have been installed, replace the thrust plates with the oversize ones. 0.15 mm [0.005 9 in.], 0.30 mm [0.011 8 in.] and 0.45 mm [0.017 7 in.] oversize thrust plates are available for service.

Generally the rear journal is likely to wear more rapidly than the front journal. This means that replacement of the rear thrust bearings will generally be sufficient.

Unit: mm [in.]

Item

Crankshaft end play

Assembly Standard

Repair Limit

0.100 to 0.264 [0.0039 to 0.0104]

0.300 [0.0118]

ENGINE MAIN PARTS

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS Crankshaft grinding dimensions for oversize thrust plates Unit: mm [in.]

Figure 142 Measuring crankshaft end play

5.

Oversize

Oversize for front or rear

Oversize for front and rear

0.15 [0.005 9]

31.15 [1.2264]

31.30 [1.2323]

0.30 [0.011 8]

31.30 [1.2323]

31.45 [0.2382]

0.45 [0.017 7]

31.45 [1.2382]

31.60 [1.2441]

Tolerance

+0.039 0 +0.00154 0

Measuring crankshaft deflection Support the crankshaft on its journals in V-blocks, then measure the deflection at the center journal with a dial gage. Depending on the amount of deflection, repair the crankshaft by grinding or straightening with a press. If the deflection exceeds the repair limit, replace the crankshaft.

Unit: mm [in.]

Assembly Standard

Repair Limit

0.02 [0.0008] or less

0.05 [0.002]

Item Figure 143 Measuring crankshaft deflection

Crankshaft deflection

6.

Replacing crankshaft gear 1)

Use gear puller to remove the gear from the crankshaft.

CAUTION Do not remove the gear by tapping with a hammer.

Figure 144 Replacing crankshaft gear

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 2)

ENGINE MAIN PARTS Heat a replacement gear up to 100°C [212°F] with a gear heater. Put the gear on the crankshaft with its keyway aligned with the key and tap the end face of the gear with a hammer.

To be aligned

Figure 145 Installing crankshaft gear 7.

Checking oil seal running surface Check the oil seal running surface of the crankshaft for wear. If the crankshaft is badly worn, replace the oil seal complete with oil seal sleeve.

Oil seal

Oil seal running surface

Figure 146 Checking oil seal running surface 1) Sleeve installer

Guide (30691-13100)

Installer (30691-13200)

Figure 147 Installing oil seal sleeve

Installing oil seal sleeve Apply oil to the inside of an oil seal sleeve and, using oil seal sleeve installer set (3069113010), install the sleeve in position, as shown in the illustration.

CAUTION Be careful not to cause damage to the sleeve when installing it.

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS

ENGINE MAIN PARTS

The oil seal sleeve will be worn in the course of time. In such a case, replace both the oil seal and sleeve.

Oil seal Oil seal sleeve

Figure 148 Checking oil seal running surface 2)

Removing oil seal sleeve Hold a flat chisel at right angles to the sleeve and cut the sleeve at three places to loosen it, as shown in the illustration. If it is impossible to remove the sleeve in this method, hold the chisel in the axial direction and lightly tap the sleeve to loosen it.

CAUTION Be careful not to cause damage to the crankshaft when removing the sleeve.

Figure 149 Removing oil seal sleeve

19.2.5 Main bearings 1.

Scratching, corrosion or flaking

Figure 150 Inspecting main bearing surface

Inspecting the main bearing surface Inspect each bearing shell for abnormal contact such as scratching, corrosion, flaking, etc. Also check for signs of poor seating in the bore of the crankcase or bearing cap.

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 2.

ENGINE MAIN PARTS

Clearance between bearing and journal Install the bearings to the crankcase and bearing cap. Tighten the cap to the specified torque.

Measure the inside diameter of the bearing in two positions lengthwise and three crosswise as shown in the illustration to take an average. Check the clearance between the bearing and journal on the basis of this measurement.

Unit: mm [in.]

Item

Assembly Standard

Repair Limit

Clearance between bearing and journal

0.050 to 0.110 [0.0020 to 0.0043]

0.200 [0.0079]

98 to 108 N·m (10.0 to 11.0 kgf·m) [72 to 80 lbf·ft]

Figure 151 Measuring main bearing

3.

Replacement If the clearance between the bearing and journal exceeds the repair limit, replace the bearings, or grind the crankshaft and use undersize bearings. If the crankshaft is ground, it is necessary to check the bearing contact.

19.2.6 Tappets 1.

Inspecting cam contact face of tappet Replace the tappets if there cam contact faces are abnormally worn.

Good

Bad

Bad

Figure 152 Cam contact face of tappet 2.

Measuring diagram

Measuring clearance between tappet and tappet bore Measure the diameter of the tappet and the inside diameter of the bore for the tappet, as shown in the illustration, to check the clearance between the two. If the clearance exceeds the repair limit, replace the tappet.

Unit: mm [in.]

Figure 153 Measuring clearance between tappet and tappet bore

Item

Assembly Standard

Inside diameter of tappet bore

14.000 to 14.018 [0.5512 to 0.5519]

Clearance between tappet and tappet bore

0.016 to 0.052 [0.0006 to 0.0021]

Repair Service Limit Limit 14.100 [0.5551] 0.08 [0.0031]

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS

ENGINE MAIN PARTS

19.3 Reassembly 1.

Installing main bearings 1)

2)

Oil grooves

3)

Figure 154 Installing main bearings 2.

Install each upper shell of the main bearing to the crankcase so that the bearing lug fit into the notch in the crankcase. The oil hole in the bearing and crankcase will be aligned when the bearing is so installed.

Apply a small amount of engine oil to the bearings.

Install the thrust plate to the rear face of the crankcase with oil grooves toward the outside as shown in the illustration.

Installing crankshaft 1) 2) 3)

Wash the crankshaft with cleaning solvent, and dry it by air blow.

Hold the crankshaft in a horizontal position by using a hoist, and carefully put it in the crankcase.

Lightly coat the journals with engine oil.

Figure 155 Installing crankshaft 3.

Three Bond No. 1212

Installing main bearing caps 1) 2)

Three Bond No. 1212

Figure 156 Installing main bearing caps

Apply engine oil to the bearings and install the bearings to the caps.

Apply Three Bond 1212 to the corners of the rear bearing cap and install the cap to the crankcase so that the rear face of the cap is even with the rear face of the crankcase.

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 3) Crankcase

Bearing cap

Side seal

4)

Rounded side

ENGINE MAIN PARTS Apply soapy water to the side seals and put the seals in the groove in each bearing cap with rounded side toward outside. Push them into position with the blade of a screwdriver or the like, taking care not to bend or twist them.

Apply Three Bond 1212 to and around the side seals.

NOTE Install the main bearing caps in number sequence.

Figure 157 Installing side seals 4.

Installing main bearing cap bolts Apply engine oil to the bolts and tighten them to the specified torque.

Tightening torque for main bearing cap bolts

98 to 108 N·m (10.0 to 11.0 kgf·m) [72 to 80 lbf·ft]

Figure 158 Installing main bearing cap bolts 5.

Measuring crankshaft end play After installing the bearing caps, check the end play of the crankshaft. (Refer to 4.2.)

Figure 159 Measuring crankshaft end play

ENGINE MAIN PARTS

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 6.

WEIGHT mark

Assembling piston and connecting rod 1)

Apply engine oil.

2)

Assemble the piston and the connecting rod with the WEIGHT mark of the piston and the MATCHING mark of the rod on the same side.

Apply engine oil to the piston pin and insert the pin into position.

MATCHING mark

Figure 160 Assembling piston and connecting rod (direct injection type)

( 3)

Install each snap ring in the snap ring groove of the piston with snap ring pliers. Make sure the snap ring fits in the groove properly.

NOTE Install the snap ring with the ends toward the bottom of the piston.

Figure 162 Installing snap rings

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS

No. 2 compression ring

Oil ring

Installing piston rings

No. 1 compression ring

Top mark

ENGINE MAIN PARTS

Put the compression rings and oil ring in the ring grooves of the piston with piston ring pliers

NOTE Install the compression rings on the piston with “R” or “T” mark toward the top of the piston.

Figure 163 Installing piston rings 2)

Install the oil ring with the joint of the coil spring 180° apart from those of the ring gap.

Joint of coil spring

Ends of oil ring

Figure 164 Ends of oil ring and coil spring 8.

Preparation before installing pistons 1) 2) 3)

Figure 165 Preparation before for piston installation

Lay the crankcase on its side Clean the cylinder bores with a clean rag and apply engine oil to the bore surfaces.

Put the connecting rod cap bolts in the big end of the connecting rod so that the flats of their heads fit to the rod properly.

ENGINE MAIN PARTS

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 4)

Tab and groove

Install the upper half of the connecting rod bearing to the big end of the connecting rod, making sure the locating lug fits into the notch in the rod. Apply engine oil to the bearing.

Figure 166 Connecting rod and bearing 9.

Camshaft side

Inserting pistons 1)

End gap of No. 1 compression ring

End gap of oil ring

End gap of No. 2 compression ring Inlet valve side

Figure 167 Configuration of piston ring ends (direct injection type)

Apply engine oil to the piston rings. Install the rings on the piston with the ring ends positioned as shown in the illustration.

PISTONS, CONNECTING RODS, CRANKSHAFT, CRANKCASE AND TAPPETS 2)

3)

FRONT mark

ENGINE MAIN PARTS Turn the crankshaft to bring a crankpin to install the piston and connecting rod assembly top dead center. Using piston installer (34491–00200), put the assembly in the cylinder, with FRONT mark () on the piston toward the front of the engine.

After resting the big-end of the connecting rod on the crankpin, turn the crankshaft 180° while pushing the piston head to bring the big- end to a position where the cap can be installed easily.

Piston installer

Figure 169 Installing piston and connecting rod assembly 10. Installing connecting rod cap 1)

2)

Install the lower half of the connecting rod bearing to the cap, making sure the locating lug fits into the notch in the cap. Apply engine oil to the bearing.

Install the cap to the rod and tighten the cap nuts to the specified torque.

Tightening torque for front cap nuts

Figure 170 Installing connecting rod cap

49.0 to 59.0 N·m (5.0 to 6.0 kgf·m) [36.2 to 43.4 lbf·ft]

CAUTION Make sure the matching mark on the cap is on the same side as the mark on the connecting rod.

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Toro 30581- Turbocharger rebuild kit part # 49189-Z3819

Toro 30581- Engine Parts contact phone: 269 673 1638 email: EngineParts@HeavyEquipmentRestorationParts.com

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