Section IV. Repair of Connecting Rod and Piston Assembly

*TM 9-2815-213-34

tighten cap bolts. Recheck end clearance. If the original

shaft and thrust rings are installed and end clearance

exceeds the wear limits the thrust rings must be

replaced.

l. Check clearance between main bearing caps

and block at side bolt contact area on each of cap;

clearance must be 0.002-0.005-inch fig. 3-7).

m. Coat threads of bearing cap side bolts v

OE-10 lubricant.

n install bolts and flat washers engage threads by

hand.

o. Refer to figure 3-8 for bolt tightening sequence.

Torque each bolt to 70-75 foot-pounds 35-40 foot-

pounds increments.

Figure 3-7. Bearing cap to block clearance check.

Figure 3-6. Crankshaft end clearance check.

Figure 3-8. Side bolt tightening sequence.

Section IV. Repair of Connecting Rod and Piston Assembly

; depressions with a 1/16-inch radius or less are not

3-13. Disassembly

acceptable on the edge of the I beam section or on the

a. Remove piston pin snap rings.

periphery of the forging. Nicks, notches, or gashes

b. Heat pistons in hot water for several minutes to

1/32-inch or less in depth may be removed by grinding

facilitate pin removal. Push pin from piston with thumb

and blending to the original contour within a minimum

pressure.

distance of inch on either side of the defect.

c. Using a suitable ring expander remove piston

b. Assemble cap to rod and tighten down bolt nuts

rings (fig. 3-9).

to proper torque (para. 3-186).

c. Check crankpin bore with inside micrometers.

NOTE

The bore must be within limits shown in paragraph 3-

177. Out-of-round limits should not exceed 0.00075

Maintain each rod and piston assembly

inch.

as a group. Do not mix with other

d. Using a dial bore gage, check crankpin bore for

assemblies.

out-of-round condition. Out-of-round limits must not

exceed 0.00075 inch.

3-14. Cleaning

e. Using inside micrometers, check piston pin

Refer to paragraph 25 for cleaning instructions.

bushing diameter. Piston pin bushing bore must

3-15. Inspection

a. Inspect rod visually for nicks, notches gashes

3-5