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TM 5-2420-222-34
3-11.
PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING MAINTENANCE (Con’t).
NOTE
Piston compression rings and oil ring come as a set of three. Oil ring Is made up
of two parts; an oil ring and an oil ring expander.
8.
Using piston ring expander, install two new compression rings (14 and 15), new oil ring (13), and new oil ring expander
(12).
9.
Using thickness gage, measure ring clearance. Clearance must not exceed 0.008 in. (0.203 mm).
10. Using piston ring expander, remove two compression rings (14 and 15), oil ring (13), and oil ring expander (12) from
piston.
11. Inspect sleeve bushing (17) for cracks, breaks, and excessive wear. Using rod measuring kit, measure inside
diameter. Inside diameter must be 1.3760-1.3800 in. (34.9504-35.0520 mm).
12. Inspect piston pin (16) for cracks, bends, or breaks. Using micrometer caliper set, measure outside diameter. Outside
diameter must be 1.3748-1.3752 in. (34.9199-34.9301 mm).
13. Subtract measurement taken in step 12 from measurement taken in step 11. The difference is oil clearance.
Clearance must be 0.0008-0.0042 in. (0.0203-0.1067 mm).
14. Inspect connecting rod (9) for cracks, breaks, and damaged threads. Restore damaged threads with screw threading
set.
15. Place connecting rod (9) in vise with caps. Position connecting rod bearing cap (5) on connecting rod. Coat threads
of two bolts (6) with engine oil. Install bolts and washers (7) in connecting rod bearing cap and connecting rod.
Torque bolts to 65 lb.-ft. (88 N•m).
16. Using rod measuring kit, measure bore diameter of connecting rod (9) and connecting rod bearing cap (5). Diameter
must be 2.9000-2.9010 in. (73.6600-73.6854 mm).
17. Remove two bolts (6) and washers (7) from connecting rod bearing cap (5) and connecting rod (9). Remove
connecting rod bearing cap from connecting rod.
18. Slide upper sleeve bearing half (8) in place on connecting rod (9). Ensure that tang on upper sleeve bearing half fits in
locking groove of connecting rod.
19. Slide lower sleeve bearing half (4) in place in connecting rod bearing cap (5). Ensure that tang on lower sleeve
bearing half fits in locking groove of connecting rod bearing cap.
20. Position connecting rod bearing cap (5) and assembled lower sleeve bearing half (4) in place on connecting rod (9)
and assembled upper sleeve bearing half (8).
21. Coat threads of two bolts (6) with engine oil. Install bolts and washers (7) in connecting rod bearing cap (5) and
connecting rod (9). Torque bolts to 65 lb.-ft. (88 N•m).
22. Using rod measuring kit, measure bore diameter of upper and lower sleeve bearing halves (8 and 4). Diameter must
be 2.7502-2.7522 in. (69.8551-69.9059 mm).
23. Remove two bolts (6) and washer (7) and connecting rod bearing cap (5) with assembled lower sleeve bearing half (4)
from connecting rod (9) and assembled upper sleeve bearing half (8).
24. Remove upper and lower sleeve bearing halves (8 and 4) from connecting rod (9) and connecting rod bearing cap (5).
3-72
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