CONNECTING RODS AND PISTONS.

TM 9-4940-421-14

AR 701584

Legend for fig 6-13:

1. Capscrew

2. Lockwasher

3. Gear

4. Camshaft

5. Valve tappet assembly

6. Spring

7. Plunger

Figure 6-13. Camshaft exploded view.

of the connecting rod (7).

6-17. CONNECTING RODS AND PISTONS.

a. General The pistons are made of heavy duty alloy

( 6 ) Push the piston and connecting rod out

casting, and are equipped with two compression rings,

through the top of the cylinder bore, Be careful not to

one scraper ring and one oil ring. The upper end of the

scratch or mar the bore. Reassemble the connecting rod

connecting rod is fitted with bronze bushing. The con-

cap.

necting rod has a shell bearing.

NOTE

The connecting rods and caps are matched and must be

b. Removal.

paired together to insure correct installation. The caps and

(1) Remove cylinder head (para 6-11).

rods are marked with their respective cylinder numbers.

(2) Remove the oil pump (para 6-15).

c. Disassembly.

(3) Remove the carbon and ridge at the top of the

(1) Remove the piston rings from the pistons.

cylinder bore with a ridge reamer,

(2) Remove the retaining rings (6) and push the

(4) Turn the crankshaft until the lower end of the

piston pin (5) out from the piston (4) and connecting

desired connecting rod is accessible.

rod (7).

(5) Remove the nuts (18, fig 6-14) from the con-

(3) Remove the piston pin bushing (27). Place the

necting rod bolts (8). Loosen the cap from the bolts by

connecting rod in a press, and press out the bushing.

tapping it with a soft-faced hammer. Remove the cap