Reassembly - TM-55-1930-208-240275

TM 55-1930-208-24

4-11. PISTONS AND CONNECTING RODS- Continued.

f. Reassembly - Continued.

(21) Starting with the bottom ring, install compression rings with tool J8128. To avoid breaking oroverstressing

rings, do not spread them any more than necessary to slip them over the piston. Refer to figure 4-35 for ring

identification and location.

(22) Stagger the ring gaps around the piston.

(23) Install ring expanders in oil control ring grooves in piston skirt. When installing oil control rings, use care to

prevent overlapping ends of ring expanders. An overlapped expander will cause the oil ring to protrude beyond

allowable limits and will result in breakage when piston is inserted in ring compressor during installation in

cylinder liner. Do not cut or grind ends of expanders to prevent overlapping. Cutting or grinding the ends will

decrease the expanding force on the oil control rings and result in high lubricating oil consumption.

NOTE

When peripheral abutment type ring expanders are used, install them with the legs of the free ends toward

the top of the piston. With free ends pointing up, a noticeable resistance will be encountered during

installation of the piston if ends of the expander are overlapped and corrective action can be taken before

ring breakage occurs.

(24) Install oil control rings by hand. Start with the upper half of the top oil ring and align the gaps as indicated

4-42