TM 9-4310-397-14
6-10. CONNECTING ROD, PISTONS, RINGS, AND LINERS AND CYLINDER BLOCK INSPECTION AND
REPAIR. - Continued
4
Use a feeler gauge to measure distance (F) between piston skirt and liner at 90° to piston pin bore.
Record the measured distance (F).
5
Turn piston 90° in liner. Use a feeler gauge to measure distance between piston skirt and liner 90°
to piston pin bore. Record the measured distance. The difference between the two measurement
steps (3) and (5) is the distance the liner is out of round at the top of the liner.
6
If liner is out of round more than 0.002 in. (0.05 mm) at top or bottom, install a new one.
7
Find difference between distance measured in Step (1) and distance measured in Step (3). This is
the distance the liner is tapered.
8
If liner is tapered more than 0.002 in. (0.05 mm) install a new one.
(i)
Deglaze cylinder liners.
1
Secure cylinder liner in a holding fixture.
2
Use Flex-Hone (item 25, section III, appendix B) to deglaze cylinder liner.
NOTE
Use honing lubricating oil (item 10, section II, appendix E) along with flex hone
when deglazing liners.
(3)
Inspect and measure connecting rod bearings.
NOTE
Never use new connecting rod cap screws when checking rod bearing ID. Use
new cap screws only for final assembly of connecting rods.
(a)
Rod bearing-to-journal oil clearance can be checked with bearing clearance gauge (items 21, 22, and 23,
section II, appendix E) (Plastigage) if rod is connected to crankshaft. If rod is out of engine, measure ID
of connecting rod bearings and compare with OD of crankshaft journal.
NOTE
Remember, the use of bearing clearance gauge (Plastigage) will determine bearing
journal clearance, but will not indicate the condition of either surface.
(b)
With crankshaft removed, measure connecting rod journal OD at several points.
(c)
Install connecting rod cap on rod with bearings.
(d)
Install rod cap screws and tighten to 55 ft-lb (75 Nm).
(e)
Using an inside micrometer measure ID of bearing.
(f)
Subtract OD of crankshaft journals from ID of rod bearings to obtain oil clearance.
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