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TM 5-2420-222-34
3-8.
CRANKSHAFT MAINTENANCE (Con’t).
c.
CLEANING AND INSPECTION
WARNING
•
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only In a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open
flame or excessive heat. The solvent's flash point is 100°F-138°F (38°C-590C).
If you become dizzy while using cleaning solvent, Immediately get fresh air and
medical help. If solvent contacts eyes, Immediately wash your eyes and get
medical aid.
•
Compressed air used for cleaning or drying purposes, or for clearing
restrictions, should never exceed 30 psi (207 kPa). Wear protective clothing
(goggles/shield, gloves, etc.) and use caution to avoid injury to personnel.
1.
Clean oil passages of crankshaft with dry cleaning solvent and X in. wire brush, then dry with compressed air.
2.
Clean all other metal parts with dry cleaning solvent and dry with compressed air and rags.
3.
Check all bearing journals of crankshaft for ridges, grooves, and discoloration caused by overheating. If
crankshaft has been overheated, heat treatment has been destroyed and crankshaft must be replaced.
4.
Using micrometer caliper set, measure and record diameter of each crankshaft main bearing journal at several
locations. Diameter must be 3.1230-3.1240 in. (79.3242-79.3496 mm).
5.
Subtract the smallest measurement from the largest measurement taken in step 4. The difference is out-of-round.
Out-of-round must be no larger than 0.0030 in. (0.0762 mm).
6.
Using micrometer caliper set, measure and note record diameter starting at one end of each crankshaft main
bearing journal and at 1 in. (2.54 cm) intervals along length of journal. Difference between each measurement is
taper. Taper must be no larger than 0.0010 in. (0.0254 mm) per 1 in. (2.54 cm) of crankshaft main bearing
journal.
7.
Using micrometer caliper set, measure and record diameter of each crankshaft connecting rod bearing journal at
several locations. Diameter must be 2.7480-2.7890 in. (69.7992-70.8406 mm).
8.
Subtract the smallest measurement from the largest measurement taken in step 7. The difference is out-of-round.
Out-of-round must be no larger than 0.0030 in. (0.0762 mm).
9.
Using micrometer caliper set, measure and record diameter starting at one end of each crankshaft connecting rod
bearing journal and at 1 in. (2.54 cm) intervals along length of journal. Difference between each measurement is
taper. Taper must be no larger than 0.0010 in. (0.0254 mm) per 1 in. (2.54 cm) of crankshaft connecting rod
bearing journal.
CAUTION
When installing main bearings and main bearing caps on engine block, ensure that
they are Installed in same location from which they were removed. Failure to do so
may damage parts.
NOTE
Measurement of inside diameter of one main bearing Is described in steps 10
through 18. Repeat steps for other four main bearings.
10.
Place upper sleeve bearing half (18) in position on engine block (3). Ensure that tang on upper sleeve bearing half
fits in locking groove in engine block.
3-49
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