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TM 5-4210-220-12
4-28. ENGINE - Continued
(f)
Examine connecting rod bearing inserts for scoring, pitting or visible wear. Check fit or rod bearings
on crankshaft journals. Clearance between bearing and crankshaft journals must be between 0.005
and 0.0021 in. (0.127 and 0.053 mm). If damage is evident or clearance does not meet the specified
dimensions new inserts must be installed.
(g)
Check clearance between side of connected rod bearing cap and crankshaft if clearance exceeds
0.010 in. (0.25 mm) new rod and bearing cap must be installed.
Connecting Rod Journal Width........ 1.3670/1.2650 in. (34.722/32.131 mm).
NOTE
The connecting rod and rod bearing cap must be replaced as a unit.
(9)
Inspect cylinder block as detailed below.
(a)
Examine cylinder block for cracks. Replace if damaged.
(b)
Examine cylinder bores for scratches, scoring and pitting. Check bores for out-of-round or taper. If
out-of-round more than 0.0005 in. (0.013 mm) or tapered more than 0.001 in. (0.03 mm) from top to
bottom of bore, the block must be rebored or honed oversize, or replaced with a new cylinder block.
Cylinder Bore .................................. 2.7500/2.7495 in. (69.850/69.837 mm).
(10)
Check crankshaft and bearings as detailed below.
(a)
A bent or twisted crankshaft cannot be repaired if connecting rod journals are scored beyond repair
or worn beyond the specifications, replace with a new crankshaft or regrind journals. Service insert
bearings are available at 0010 and 0020 in. (025 mm and 0 51 mm) undersize.
Connecting Rod Journal Diameter .. 1.1855/1.1850 in. (30.112/30.099 mm)
Main Bearing Journal Diameters ..... 1.3784/1.3779 in. (35.011/34.999 mm)
(b)
Thread, keyway, and all ground and machined surfaces must not be mutilated or worn.
(c)
Examine ball bearings for worn or damaged balls, rotate bearing by hand to detect roughness. If
wear, roughness or damage is evident, bearing must be replaced. See para. 2-7 bearing
replacement.
Ball Bearing Outside Diameter ........ 2.8341/2.8346 in. (71.986/71.999 mm).
Inside Diameter............................... 1.3775/1.3780 in. (34.989/35.001 mm).
(11)
Check the crankshaft bearing cap as detailed below.
(a)
Examine crankshaft rear bearing cap and replace if worn or cracked.
Bearing Cap Seal Diameter ............ 0.636/0.635 in. (16.15/16.13 mm).
4-545
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