5-20. CRANKSHAFT MAINTENANCE INSTRUCTIONS - Continued
P - D - 6 8 0 , m o d e r a t e l y t o x i c t o
the skin, eyes and respiratory tract;
avoid prolonged exposure. Skin and
eye protection is required. Good ventila-
tion is required. Do not use near open
flame or excessive heat. Flash point is
1. Clean the exterior of assembled seal housing (3)
and bearing with a rag, dampened with dry clean-
ing solvent and dry thoroughly.
2. Clean all other parts in dry cleaning solvent and
1. Visually inspect the crankshaft (10) for scoring
connecting rod journal, front main bearing jour-
nal, and inner race of rear bearing. Replace
defective crankshaft to general support mainte-
crankshaft if any defects are found, and forward
2. Visually inspect the crankshaft (10) for fatigue
cracks at corners of connecting rod journals. Re-
place crankshaft if any defects are found, and for-
ward defective crankshaft to general support
3. Visually inspect the front main bearing journal of
crankshaft (10) for grooving as indicated by a
ridge around middle of journal. Replace crank-
shaft if any defects are found, and forward defec-
tive crankshaft to general support maintenance.
Grooving of the front main bearing journal
is indication that the front main bearing, in-
stalled in the engine housing, is also worn.
Perform inspection of front main bearing
as described in paragraph 5-21.
defects are found, and forward defective crank-
shaft to general support maintenance.
Inspect the seal housing (3) for cracks or other
visible damage. Replace seal housing (3) if dam-
6. Using an inside micrometer caliper, measure dis-
tance between crank cheeks, at point indicated. If
4. Visually inspect the crankshaft (10) gear for bro-
ken or cracked teeth. Replace crankshaft if any
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