MAIN BEARINGS, BALANCER, FLYWHEEL AND CRANKSHAFT

Figure 53-installing Cylinder Sleeve

Cylinder Sleeve Installation:

1. Clean the cylinder counterbore thoroughly before installing sleeves. Assemble Cylinder Sleeve

Installer FT -910 and a new sleeve on the cylinder block as shown in Figure 53. Turn the screw clockwise until the sleeve is bottomed in the oounterbore. 2. Using a number 220 grit stone at a drill speed of 250-450 rpm, pass a hone througb tbe sleeve bore not more than 10 times to roughen up the bore. This promotes hetter ring seating and also "trues up" the sleeve. 3. Fit the pistons in the cylinder block as detailed in paragraph E.

MAIN BEARINGS, FLYWHEEL AND CRANKSHAFr

The main bearings and balancer can be replaced with the engine in the tractor. The flyWheel can be removed by removing the engine or by splitting the tractor between the engine and transmission. The engine must be removed before removing the crankshaft.

A. Removal l\'IAIN BEARINGS

L Remove the oil pan and oil pump,

NOTE: On engines equipped tvlth a balancer, remove the balancer as detailed in Balancer removal to gain to the bearing caps.

2. Remove the two bolts that attach the main bearing cap to the cylinder block and remove the cap and bearing, Install a bearing insert remover in the oil passage of the crankshaft as shown in

Figure 54. Tum the crankshaft counterclockwise slowly until the tool forces the bearing out of the cylinder block.

NOTE: If a bearing insert tool is .not able, flatten the head of a 1" x cotter pin ana bend lhe heml at appmximately a 30'" angle to conform to tile angle of the oil pas· sage in lhe aankslwjl, see Figure 55. Use the labricmed tool in the same manner to remove and install bearing inserts, The shorter cotter pin mu.st be used to rel1wve the center mnin bearing insert.

B. Inspection

Clean the hearing inserts, journals and cap thoroughly. Inspect each bearing carefuHy. Bearings that have a scored, chipped or worn surface should be replaced. Typical examples of hearing failures and their causes are shown in Figure 56. Check the clearance of hearings that appear serviceable with Plastigage, following the recommended procedure.

Figure 54-Removing Main Bearing Insert Figure 55-Fabricated Main Bearing Inserf Tool

c. Fining l\'lain Bearings (Plastigage Method)

1. Remove the oil pan and oil pump. Remove a main hearing cap and wipe the oil from the hearing and crankshaft journal.

NOTE: 11 the bearings are being fitted with the engine in the tractoOr, a jack should be used adjacent to tile bearing being fitted to holtl the crankshaft up against the upper mnin bearings.

2. Place a piece of the correct size Plastigage the fuB width of the hearing journal, if the engine is inverted. Place the Plastigage in the bearing cap, if the engine is in the normal operating position. Install the bearing cap and tighten the retaining bolts to 95-105 ft. lbs. torque (gasoline or LP·Gas engines) or 110-115 ft. lbs. torque (diesel engines).

IMPORTANT: Do not turn the crankshaft while tlte Plastigage is between the bearing and the journal.

3. Remove the hearing cap. Without moving the plastic, check its width at the widest point with the graduations on the PIsstigage container, as shown in Figure 57.

NOTE: IVormally, main bearing journals wear evenly and are not out of round. However, il a bearing is fitted to an out 01 round journal, be sure to fit the bearing to the max;' mum diameter of the journal.

4. If the hearing is fitted to the minimum cl.earance of 0.0005" (babbitt) or 0,0019" (copper lead) on the minimum diameter of the journal,. and the journal is out of round 0.0005" armore, interference between the journal and hearing will result in rapid failure af the hearing.

Figure 56- Bearing Failures- Typical

5. If the clearance is not within limits, try the selective fit: undersize bearings to bring the clearance within limits, see Section 1 L If the selective fit undersize bearings do not bring the clearance within limits it will be necessary to regrind the crankshaft journals for use with the next undersize bearing.

NOTE: 11 the flattened plastic is not u:rdlorm in widlh Irom end to end, the journal or bearing is tapered. Be sure to check the journal with micrometers if the flatl.ened plastic indicates more than 0.001" difJerence.

6. Remove the jack from under the crankshaft after the bearings have been selected.

D. Installation

1. Lubricate the bearing insert with engine oil.

2. With the bearing insert installation tool in the crankshaft at the manifold side of engine, hold the bearing in place on the crankshaft with the plain end of the bearing at the locking tang side of the cylinder block. Tum the crankshaft clockwise until the bearing is seated in the block.

NOTE: Pressure may have to be applied ()n the bearing insert to prevent the installation tool from slipping under it.

figure 57- Measuring FlaHened Pla,'igage

3. Install the lower half of the bearing insert in the bearing cap and lubricate the bearing with engine oil. Hold the bearing cap in place with the locking tang toward the camshaft side of the engine and install the two bolts and washers.

Tighten the bolts to 95-105 ft. 100. torque.

BALANCER

Starting with Serial No. 102351 on 112 cu. in. diesel engines, a balancer is provided to dampen out engine vibration. The balancer is attached to the cylinder block by special bolts and is driven by a drive gear provided on the crankshaft, see Figure 58.

A. Removal

1. Remove the oil pan and oil pump. Remove the remaining holt that attaches the bame to the balancer and remove the baffle. 2. Remove the hollow bolt, hex hoIt and special retainers that attach the balancer to the cylinder block and remove the balancer.

B. Inspection

1. Check the counterweight gears for wear, cracks or looseness on the pivot shafts .. 2. Check the gear housing for cracks. 3. Check the needle bearings for roughness or wear by rotating the gears. 4. Replace the balancer if any of these conditions are evident.

C. Installation

1. Make sure that the mounting surfaces on the cylinder block and balancer are dean. Rotate the crankshaft until the timing mark on the flywheel and No. 1 cylinder are at TDC (top dead center). Rotate the counterweight gears to align the balance mark on the counterweight drive gear with the mark on the crankshaft gear as shown in Figure 59. 2. With the balance marks aligned, place the ancer in position on the cylinder block. Instalt the two retaining bolts. Tighten the larger bolt to 70-80 ft. ibs. torque and the sroaUer bolt to 60-70 ft. 1bs. torque. 3. Install a dial indicator on the cylinder block with the button contacting the balancer drive gear. Set the dial at zero then check the backlash between the crankshaft gear and balancer drive gear. The backlash should be 0.005"· 0.012".

4. After obtaining the specified backlash, install the two special retainers and retaining holts then tighten them to the specified torque. Bend the tabs on the retainers to lock the bolts in place. Install the bame and tighten the attaching holts to 6-9 ft. Ibs. torque.

NOTE: Tile baffle attaching bolts should not be tightened until the oil pump inlet tube antI screen has been installed.

5. Install the oil pump and oil pan. Fill the crankcase to the proper level with the recommended oil. Start the engine and check for leaks.

FLYWHEEL

There are several different flywheels used on Ford Tractor engines. The flywheels differ in size; however, the basic function of the flywheels is the same. The weight of the flywheel is used to eliminate engine roughness while the rear face is used as a friction surface for the clutch. A ring gear is mounted on the flywheel to provide a means of starting the engine. The flywheel mounts on a shoulder at the rear of the crank-

fjgure 58-BcdcJl'I(er Installed Figure 59-Installing Crankshaft Balancer

shaft and is retained by six bolts. The mounting holes are unevenly spaced 80 that it can be mounted in only one positioIL

A. Removal

1. Split the tractor between the engine and tran&ml88ion or remove the engine. 2. Remove the (dutch housing Select-O-Speed) pressure plate and clutch disc from the engine. 3. Before removing the flywheel attaching bolts, check the runout with a dial indicator, see Figure 60. Remove the six flywheel attaching bolts.

Tap the flywheel with a soft mallet or hammer to loosen it on the crankshaft. Lift the flywheel from the crankshaft.

CAUTION: Grasp the flywheel firmly while tapping it with a hammer ta prevent drop' ping it and causing persQnal injury.

8. Inspection

1. Replace the flywheel if the runout exceeds 0.008". Inspect the friction surfaces of the flywheel and the clutch pressure plate for score marks, check marks and for evidence of overheating. 2. Replace the ring gear if loose on the flywheel or if the teeth are worn or brokeIL 3. Replace the clutch pilot bearing if the bearing feels rough when rotated. c. Repair

flywheel Ring Gear Replacement: 1. Drill a ¥.til hoie nearly through the ring gear.

Do not driU into the flywheel. Split the gear with a chisel. Wipe the replacement gear and flywheel mating surfaces dean before installing the new gear. 2. Expand the gear by uniformly heating it to approximately 360" (gear wiU appear to change from a light to a dark straw color at this perature) then quickly transfer it to the flywheel and allow it to cool.

IMPORT ANT: Do not overh.eat th.e gear more than 360" as softening will result. 3. Check the gear runoutafter the flywheel is installed on the crankshaft. The runout must not exceed 0.008".

Clutch Pilot Bearing Replacement: 1. Drive the bearing out of the flywheel with Clutch

Pilot Bearing Replacer 7600-C. The bearing can be removed with bearing remover 7600-E if the flywheel is installed, see Figure 61. 2. Install the bearing with Clutch Pilot Bearing

Replaced 7600-C, see Figure 62.

D. Installation

1. Clean both mating surfaces before installing the flywheel. 2. Check the runout of the crankshaft flange with an indicator before installing the flywheel. Runout must not exceed 0.001".

Figure 60- Cheddl1g flywheel Runout figure 61-Removing Clutch Pilot Bearing

fjgvre 62-lnstalling Clutch Pilot Beating

3. Place the flywheel in position on the crankshaft, install the cap screws and tighten them to 75-85 ft. lbs. torque. 4. After instaHation, check the rollOUt. If the rollout exceeds 0.008" total indicator reading, the flywheel should be replaced. 5. Install the engine or connect the transmission to the engine.

CRANKSHAFT

A. Removal

1. Remove the engine from the tractor and place it in an engine stand. 2. Remove the oil pan, oil pump, flywheel and rear cover plate. Remove the crank ratchet or bolt, washer and pulley. 3. Remove the bolts that attach the governor housing to the cylinder front cover and remove the housing and lever.

NOTE: Engines up through 1956 have a governor housing. Alter 1956 the governor housing is an integral part oj the cylinder front cover. 4. Remove the bolts that attach the cylinder front cover to the cylinder block and remove the cover. Slide the governor off the crankshaft (gasoline and LP-Gas engines only). Remove the balancer from the cylinder block if so equipped.

5. Remove the connecting rod bearing caps and, if they are not numbered, mark them so that they Can be reinstaHed on the same rod. assembly. Remove the main bearing caps and the crankshaft. Reinstall the bearing caps on the cylinder block for safe keeping, after the shaft is removed. Remove the rear main bearing seal from the cylinder block.

B. lnspection

L Clean the crankshaft in a tank of solvent. Clean all drilled passages with a rifle brush then blow out the passages with compressed air. 2. Place the crankshaft on "v" blocks to check the runout at the center journal with a dial indicator. Replace the shaft if the runout exceeds 0.003". Replace the crankshaft gear if worn or chipped.

3. Measure each journal at a minimum of four places to determine the wear, out of round and taper. If the out of round is in excess of 0.0005" and the taper is more than 0.001" or the wear is more than 0.002", regrind the shaft for the next undersize bearings or replace the shaft. Main and connecting rod bearings are available in 0.001", 0.002", 0.010" and 0.020" undersize. New crankshaft dimensions are as fonows:

Main Journal Diameter ....... . .... 2.4974"-2.4988"

Connecting Rod. -134 and 172 Cu. In. Gasoline or LP-Gas engines . . . . . .. 2-4969"-2.4977" - 144 and 172 Cu. In. Diesel engines.

Journal Diameter ..... . ........... 2.2988"-2.2978" -134 and 172 Cu. In. Gasoline or LP-Gas engines and 144 and 172 Cu. In. Diesel engines.

C. Repair

1. Remove the crankshaft gear with Remover 6306-AE as shown in Figure 63. 2. Replace the gear with Installer 6306-AF as shown in Figure 64.

D. Installation

1. Clean the main bearing bores and oil seal groove thoroughly before installing the bearings in the block. Soak the main bearing oil seats in engine oil at least for V:z hour before instaUation. Work the seals into the rear main bearing cap and cylinder block, then seat them with forming

Tool 670l-A and hammer. Cut the edges Bush as shown in Figure 65.

2. Install the main bearings in the cylinder block and bearing caps. Lubricate them with engine

figure 63-Removing Crankshaft Gear

oil. Turn the crankshaft to position the timing mark on the camshaft gear at the bottom. Align the timing mark on the crankshaft gear with the one on the camshaft gear, then lower the crankshaft into the cylinder block. Check the bearing clearance with Plastigage. 3. Install the main bearing caps and tighten the bolts to 95·105 ft. Ibs. torque (gasoline and

LP-Gas engines) or to 110-115 ft. Ibs. torque (diesel engines).

4. Dip each rear main bearing cap vertical seal in engine oil and immediately slide it into place as shown in Figure 66. Tap the seal until it is firmly in place. The ends of the vertical seals should extend approximately % / ' beyond the surface to provide a good seal.

Il\fPORTANT; Never apply oil UJ the t)ertical seals until it is time to install them, since a swelling action takes place immediately after oil is applied.

5. Check the connecting rod bearing to crankshaft clearance with Plastigage then install and tighten the connecting rod nuts to 45-50 ft. 100.

f<igure 65-lnsfalling Rear Main Bearing Cap Oil Seal

torque. Install and tighten new pal nuts to 34 ft. lbs. torque.

6. Install the cylinder rear cover plate and flywheel. Install the governor (gasoline and LP-Gas engines only). Install the cylinder front cover and new gasket. If working on a 1956 engine or older, install the governor housing and lever.

figure 64- lnstolling Crankshaft Gear

figure 66-Inftcdling 8earing Cap Vertical Seals