d . A S S E M B LY

3-13. PISTON, CONNECTING ROD, AND CNNECTING ROD BEARING REMOVAL AND REPAIR (Cont).

/.25ton/TM-9-2320-289-34 CUCV Series Trucks at intermediate direct support and general support level Manual
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TM 9-2320-289-34 3-13. PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING REMOVAL AND REPAIR (Con’t). 13. 14. Repeat step 11 for other piston rings. Gap should be 0.01 18–0.0226 in. (0.300-0.575 mm) for upper com- pression ring (1 2), 0.0295-0,0403 in, (0.750-1 ,025 mm) for lower compression ring (11), and 0.0098-0.0211 in, (0.249-0,535 mm) for oil control ring (1 O). If any measurement is not correct, replace piston rings as a set. Place upper compression ring (12) and lower compression ring (1 1 ) in piston (8) ring grooves and roll entirely around groove. If there is binding, remove ring and inspect grooves for nicks or burrs, Smooth out nicks or remove burrs with fine cut file. Install piston rings (9, 10, 11, and 12) in piston (8) ring grooves. Using feeler gage, measure side clearance of each ring. Clearance should be 0.0030-0.0080 in. (0.076-0,203 mm) for upper compression ring (1 2), 0.0015-0.0041 in. (0.039-0.105 mm) for lower compression ring (11 ), and 0,0016-0.0048 in. (0,040-0,121 mm) for oil control ring (1 O). If any measurement is not correct, replace piston. d . A S S E M B LY N O TE Ensure that marked side of upper compression ring (12) and lower compression ring (11) face toward top of piston (8). 1. Expand upper compression ring (12) and lower compression ring (11 ) and slide into grooves in piston (8), 2. Install oil ring expander (9) and oil control ring (1 O) in piston (8) ring groove, TA50653 3 - 4 2 C h a n g e 2

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