TM 5-3895-346-14
CRANKSHAFT OIL SEALS
housing. This may be done by drilling diametrically opposite holes in the seal casing and threading metal
screws, backed by flat washers, into the casting. Remove the seal by prying against the washers with pry bars.
Inspection
Inspect the front and rear end of the crankshaft for wear due to the rubbing action of the oil seal, dirt buildup, or
fretting caused by action of the flywheel.
The crankshaft surface must be clean and smooth to prevent damaging the seal lip when a new oil seal is
installed. Slight ridges may be removed from the crankshaft as outlined under Inspection.
On in-line engines, if the crankshaft cannot be cleaned up satisfactorily, the oil seal nay be pressed into the
flywheel housing or the front cover 1/8 inch from its original position.
If excessive wear or grooving is pre- sent, install an oil seal sleeve (Fig. 3 & 4) which provides a replaceable
wear surface for the lip-type oil seal. The oil seal sleeve may be used with either the single-lip or double-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 the rear oil seal sleeve (Fig. 3) as follows:
1.
Stone the high spots from the oil seal contact surface of the crankshaft.
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 crankshaft rear oil seal sleeve installer J 21277.
4.
Wipe off any excess sealant.
5.
Coat the outside diameter of the sleeve with engine oil.
Install the front oil seal sleeve (Fig. 4) as follows:
1.
Stone the high spots from the oil seal contact surface of the crankshaft.
Figure 3. Use of rear Oil Seal Sleeve on
Grooved Crankshaft
Figure 4. Use of Front Oil Sleeve on
Grooved Crankshaft
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