Section XVIII. CONNECTING RODS, CONNECTING ROD BEARINGS, PISTONS, FILLER BLOCK, MAIN BEARING CAPS, MAIN BEARINGS, CRANKSHAFT, CRANKSHAFT GEAR, AND CAMSHAFT BUSHINGS

TM 5-4320-243-15

Figure 7-24. Rear oil seal, removal and installation.

Section XVIII. CONNECTING RODS, CONNECTING ROD BEARINGS, PISTONS, FILLER BLOCK, MAIN

BEARING CAPS, MAIN BEARINGS, CRANKSHAFT, CRANKSHAFT GEAR, AND CAMSHAFT BUSHINGS

7-53. General

control crankshaft endplay. The crankshaft gear is

The connecting rods, made of drop-forged steel, are

mounted on the front of the crankshaft and drives the

precision machined at each end. The pistons are made

camshaft gear.

of aluminum alloy and are both tapered and oval

ground. Grooves for 3 compression rings and 1 oil-

7-54. Connecting Rods, Pistons, and Piston Pins

control ring are machined into each piston above the

a. Remove and install the cylinder heads (para 7-

piston pin bore. The filler block is located at the lower

37).

rear of the cylinder assembly and must be removed for

b. Remove and install the oil pump (para 7-40).

crankshaft removal. The crankshaft is a 1-piece steel,

case hardened forging, counter balance with 12 integral

c. Remove and install the engine (para 5-13).

counterweights. Seven main bearings caps support the

d. Remove and install the connecting rods and

crankshaft in the cylinder assembly. The crankshaft

pistons as shown by figure 7-25.

rides in 7 upper-half and 7 lower-half main bearings.

Both halves of the center main bearing are flanged to

7-29