Figure 4-28. Installing Piston Pin

TM 55-1930-208-24

4-11. PISTONS AND CONNECTING RODS - Continued.

f. Reassembly - Continued.

(3) Compress the seal ring with ring compressor J23453 and push the skirt into position on the piston crown.

NOTE

Before completely assembling the piston, check to make sure the seal ring does not stick in the ring

groove. It is imperative for satisfactory engine operation that the seal ring is free in the piston crown

groove. Check the full 360circumference of the groove to be sure there are no tight spots. When the

piston crown, seal ring, and piston skirt are assembled, the skirt should spin freely on the crown (crown top

down on the bench). If the seal ring sticks, remove high spots or nicks in the groove with a flat file. If this

does not relieve sticking, replace the piston crown.

(4) Lubricate piston pin with clean engine oil (item 8, Appendix C) and install as shown in figure 4-28.

Figure 4-28 .

Installing Piston Pin .

NOTE

Line up the piston pin opening in the piston skirt with the bearing (bushing opening in the piston crown to

prevent damage to the pin or bushing.

4-36