Pistons and Connecting Rods - TM-5-4320-258-340051

TM 5-4320-258-34

0.008 inch, clean the mounting surfaces of the flywheel

housing and the block. Recheck flywheel housing

runout. If the runout is still not within limits, replace the

flywheel housing.

Figure 4-13. Checking flywheel housing eccentricity.

4-10.

Pistons and Connecting Rods

a. Removal and Disassembly. With the

engine mounted on an engine overhaul stand, proceed

as follows:

(1) Remove the cylinder head (para 4-3).

Figure 4-12. Checking flywheel housing runout.

(2) Remove the engine oil pan (para 4-6)

and oil pump (para 4-7).

(6) Check eccentricity of the flywheel

(3) Ream the ridge of the top of each

housing bore by mounting a dial indicator so that it

cylinder bore with a standard ridge reamer. Blow metal

indicates the bore (fig. 4-13); rotate the engine through

fragments from the cylinder with compressed air.

one revolution. If the housing bore is eccentric more

(4) Remove the two cotter pins (10, fig. 4-

than 0.008 inch, loosen the flywheel housing mounting

14) and nuts (11) that secure a bearing cap (13) to a

bolts and tap the housing into its proper position with a

connecting rod (20); remove the cap and bearing shells

soft hammer. Tighten the bolts and recheck eccentricity

(14).

of the housing bore. If the housing cannot be brought

Caution: While pushing the piston and rod

into true position, replace the housing.

from the block, be very careful the connecting rod

does not scratch the cylinder wall.

(5) Push assembled piston (18), rings (17),

and connecting rod (20) up through the top of the block.

(6) Refer to figure 4-14 (items 15 through

20) and disassemble the piston and connecting rod.

Note. Disassemble the pistons and piston

rods in sets, and keep the sets together. Also, be sure

each piston and piston rod set is installed in the cylinder

from which it was removed.

4-18