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