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TM 55-1905-220-14-4
3-43. CRANKSHAFT SEALS.
a.  An oil seal is used at each end of the crankshaft to retain the lubricating oil in the crankcase. The
sealing lips of the oil seals are held firmly, but not tight against the crankshaft sealing surfaces, by a coil spring.
b.  The front oil seal is pressed into the crankshaft front cover. The lip of the seal bears against a
removable spacer or vibration damper inner cone on the end of the crankshaft.
c.  A double-lip oil seal is used in engines where there is oil on both sides of the oil seal; the lips of th
e
seal face in opposite directions. The rear oil seal is pressed into the flywheel housing.
d.  Oil leaks indicate worn or damaged oil seals. Oil seals may become worn or damaged due to improper
installation, excessive main bearing clearances, excessive flywheel housing bore runout or grooved sealing
surfaces on the crankshaft or oil seal spacers. To prevent a repetition of any oil seal leaks, these conditions
must be checked and corrected.
This task covers:
a.
Inspection
INITIAL SETUP :
Test Equipment
References
NONE
NONE
Equipment
Special Tools
Condition
Condition Description
NONE
Oil Pan Removed
Lube Oil Pump Removed
Oil Inlet Pipe Removed
Material/Parts
Special Environmental Conditions
NONE
NONE
Personnel Required
General Safety Instructions
1
NONE
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