Figure 9. Piston Ring Removal.

ARMY TM 10-4610-309-14

MARINE CORPS TM 10802A-14/1

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TACTICAL WATER PURIFICATION SYSTEM (TWPS)

DIRECT SUPPORT MAINTENANCE PROCEDURES

DIESEL ENGINE

10. Using a ring spreader, remove the three piston rings from the piston (see Figure 9).

COMPRESSION RING

OIL RING

CRANKPIN

BEARING

PISTON

CONNECTING ROD

END CAP

BOLT

Figure 9. Piston Ring Removal.

Reassemble the diesel engine as follows:

1. Carefully clean each ring groove in the piston.

2. Using a ring spreader, install the new piston rings on the piston making sure each ring gap is

offset 120 from the other ring gaps.

3. Thoroughly check and clean all parts.

NOTE

There is an orientation mark on the top of the piston. This mark must face the

crankcase cover side of the engine when inserting the piston and connecting rod

assembly into the top of the piston cylinder.

4. Apply oil to the outer surface of the piston and the inner surface of the cylinder.

5. Apply oil to the crank pin (the surface on the crankshaft to which the piston connecting rod is

secured).

6. Insert the piston and connecting rod into the top of the piston cylinder.

7. Make sure the crankpin bearing halves are snapped into the connecting rod and the end cap.

8. Position the connecting rod onto the crank pin and install the end cap around the other side of the

crank pin.

9. Secure the end cap to the connecting rod using the two connecting rod tightening bolts. Torque

to 200 to 240 in-lbs.

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