flywheel housing concentricity as outlined on Page 10-2-
76. This check must be made with the flywheel housing
in place on the engine and the oil seal removed.
If the crankshaft rear oil seal surface is grooved
excessively, an oil seal spacer (Fig. 5) may be installed
between the counterbore in the flywheel housing and the
oil seal. The spacer changes the relative position of the
seal and establishes a new contact surface.
When the oil seal spacer can no longer be used, an oil
seal sleeve (Fig. 5) may be installed on the crankshaft
to provide a replaceable wear surface at the point of
contact with the rear oil seal. The oil seal sleeve may
be used with the single-lip type oil seal, and can also be
used in conjunction with the seal spacer. However, an
oversize oil seal must be used with the sleeve.
Install an oil seal sleeve as follows:
1. Stone the high spots from the oil seal contact surface
of the crankshaft.
Fig. 4. Crankshaft Rear Oil Seal Mounting
2. Coat the area of the shaft where the sleeve will be
positioned with shellac or an equivalent sealant.
3. Drive the sleeve squarely on the shaft with oil seal
Inspect the rear end of the crankshaft for wear caused
sleeve installer J 4194.
by the rubbing action of the oil seal, dirt build-up or
fretting by the action of the flywheel. The crankshaft
4. Wipe off any excess sealant.
surface must be clean and smooth to prevent damaging
the seal lip when a new oil seal is installed. Slight
5. Coat the outside diameter of the sleeve with engine
ridges may be removed from the crankshaft as outlined
under Inspection on Page 10-249.
To remove a worn sleeve, peen the outside diameter
The maximum runout of the oil seal bore in the flywheel
until the sleeve stretches sufficiently so it can be slipped
housing is .008 ". The bore may be checked with a dial
off the end of the crankshaft.
indicator mounted on the end of the crankshaft in a
manner similar to the procedure for checking the
Fig. 5. Use of Rear Oil Seal Spacer or Sleeve on Grooved Crankshaft.