DETROIT DIESEL 53
Crankshaft Oil Seals
1.3.2
2. Coat the area of the shaft where the sleeve will be
seal pointed toward the inner face of the cover or
positioned with shellac or an equivalent sealant.
bearing support.
3. Position the sleeve on the crankshaft with the radius
3. Place the cover or outboard bearing support in an
on the sleeve facing away from the engine.
arbor press (inner face down).
4. Drive the sleeve squarely on the shaft with front oil
4. On In-line
engines, use installer J 9783 to
seal sleeve installer J 22524 and the crankshaft pulley
press the oil seal into the cover until the seal is flush
retaining bolt.
with the outside face of the cover.
5. Wipe off any excess sealant.
6. Coat the outside diameter of the sleeve with engine
oil.
5. Remove any excess sealant.
To remove a worn sleeve, peen the outside diameter of
6. Install the engine front cover (Section 1.3.5) or the
the sleeve until it stretches sufficiently so it can be
outboard bearing support.
slipped off of the end of the crankshaft.
Install Crankshaft Rear Oil Seal
Oil Seals
1. Support the inner face of the flywheel housing in an
Current oil seals are made of an oil resistant synthetic
arbor press or on a flat surface.
rubber which is pre-lubricated with a special lubricant.
Do not remove this lubricant. Keep the sealing lip clean
2. If the new seal is not pre-coated, apply a non-
and free from scratches. In addition. a plastic coating
hardening sealant to the periphery of the metal casing.
which acts as a sealant has been applied to the outer
Then position the seal with the lip pointed toward the
surface of the casing. Do not remove this coating.
inner face of the housing.
3. Coat the lip of the oil seal lightly with engine oil
(single-lip seal) or vegetable shortening (double-lip
Install Crankshaft Front Oil Seal
seal). Do not scratch or nick the sealing edge of the oil
seal.
1. If the oil seal is not pre-coated. apply a non-
4. On In-Line
engines, use installer J 9479 to
hardening sealant to the periphery of the metal casing.
press the oil seal into the flywheel housing until the
2. Coat the lip of the new oil seal lightly with grease or
seal is flush with the outside face of the housing
(Fig. 6). If the flywheel housing was not removed
vegetable shortening. Then position the seal in the
from the engine, place oil seal expander J 9769
cover or outboard bearing support with the lip of the
(standard size seal) or J 21278 (oversize seal) against
the end of the crankshaft. Then, with the lip of the
seal pointed toward the engine. slide the seal over the
expander and on the crankshaft. Next. thread the
guide studs J 9479-2 into the crankshaft. Now drive
the seal into the flywheel housing with installer
J 9479-1 until it is flush with the face of the housing.
Fig. 6 . Installing Oil Seal in Flywheel Housing
6. Remove any excess sealant from the flywheel
housing and the seal.
SEC. 1.3.2 Page 3
November. 1973
