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Page Title:
INSPECTION AND REPAIR-continued |
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 TM
3-120
CONNECTING ROD AND PISTON ASSEMBLY REPAIR (CONTINUED)
Inspect connecting rod bearings for burrs, breaks, pitting,
NOTE
and wear.
If oversize pistons are used, use correct oversize
G
Remove all burrs.
rings. Do not exceed maximum clearance (table
below).
H If either rod bearing is worn or damaged, replace both bear-
ing halves.
D
File butt ends of rings if gap is too small.
I
Check clearance between connecting rod bearings and
E
Inspect connecting rods for damage. Use magnetic particle
crankshaft journal (table below).
inspection or dye-penetrating technique to detect cracks.
-
Replace connecting rod if
NOTE
Connecting rod bearings are available in O.
CAUTION
and
undersize.
Connecting rod bearings are a matched set and
If bearings are defective, replace with new standard or
J
must be replaced as a set.
undersize bearings.
Component
Allowable wear limits (inches)
DJEAM
DJBMA
Piston diameter measured below oil ring groove
Piston (standard)
3.4915 min. dia.
3.2415 min. dia.
Piston
oversize)
3.5015 min. dia.
3.2515 min. dia.
Piston
oversize)
3.5115 min. dia.
3.2615 min. dia.
Piston
oversize)
3.5215 min. dia.
3.2715 min. dia.
Piston-ring groove width
0.102 max.
Top compression ring groove
0.101 max.
Second compression ring groove
max.
compression ring groove
0.100 max.
control ring groove
0.010 to 0.020 max.
ring gap (installed)
Piston pin
Thumb push-fit
0.0002 to 0.0007
Clearance at piston
Clearance at connecting rod sleeve bearing
Connecting rod
Bearing-to-crankshaft journal clearance
0.0010 to 0.0033
0.0010 to 0.0030
measured perpendicular to
axis
1228
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