MAXIMUM WEAR TOLERANCES & CLEARANCES: EXHAUST
INTAKE
SPECIFICATIONS (INCHES)*
VALVE
CYLINDER BORE Maximum Oversize Diameter Maximum Allowable Taper Maximum Out of Round
3.503 .0015 .005
CRANKSHAFT CRANKPIN Maximum Out of Round Maximum Taper
.0005 .001
CONNECTING ROD Maximum Wear Diameter–Big End Rod to Crankpin–Max. Clear. PI–01534
Fig. 68 Valve Detail Drawing
1.5025 .0035
PISTON–THRUST FACE Maximum Wear Diameter
3.4945
PISTON RING Maximum Side Clearance
.006
VALVE STEM TO GUIDE** Exhaust–Maximum Clearance Intake–Maximum Clearance
.0065 .0045
*Maximum allowable before replacement, reboring, regrinding. **Measure at top of guide with valve closed. Taper Smaller Towards Top
Piston Pin Bore
Fig. 69 Piston Measurement Details
58 of 88
DIMENSION (SEE FIG. 68)
INTAKE
A. SEAT ANGLE 89° B. SEAT WIDTH .037/.045 C. INSERT O.D. (Engine # Suffix “A, B & C”) 1.5035/1.5045 (Engine # Suffix “D”) 1.5035/1.5045 D. GUIDE DEPTH 1–15/32 E. GUIDE I.D. .312/.13 F. VALVE HEAD DIAMETER (Engine # Suffix “A, B & C”) 1.281 (Engine # Suffix “D”) 1.281 G. VALVE FACE ANGLE 45° H. VALVE STEM DIAMETER .3105/.3110
–40–
EXHAUST 89° .037/.045 1.2535/1.2545 1.5035/1.5045 1–15/32 .312/.313 1.063 1.281 45° .3090/.3095
M–371 Loader Service Manual
Dealer Copy -- Not for Resale
Oil Control Groove
Thrust Face
