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 TM 55-1905-220-14-7
3-172.3. CRANSHAFT SEALS - MAINTENANCE INSTRUCTIONS.
a.
The crankshaft front cover is mounted against the cylinder block end plate at the lower front end of
the engine. The engine is supported at the front end by engine supports attached to the front cover.
b.
It will be necessary to remove the crankshaft front cover to remove and install the crankshaft.
c.
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.
d.
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.
e.
A double-lip oil seal is used in engines where there is oil on both sides of the oil seal; the lips of the
seal face in opposite directions. The rear oil seal is pressed into the flywheel housing.
f.
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.
3-2968
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