Crankcase Front Cover/Oil Seal; Oil Seal Replacement (Without Removing Front Cover); Crankcase; Removal - MerCruiser 454 MAGNUM Manual

Crankcase Front Cover/
Oil Seal
Oil Seal Replacement
(Without Removing Front Cover)

REMOVAL

1. Remove torsional damper.
2. Pry seal out of cover from the front with a large
screwdriver, being careful not to distort front cov-
er or damage crankshaft.
INSTALLATION
IMPORTANT: Correct rotation oil seal must be
used to prevent oil leak.
Front Seal WITHOUT Helical Grooves
a - Seal Lip Toward Inside of Engine
Front Seal WITH Helical Grooves
a - Seal Lip Toward Inside Of Engine
b - Rotation Of Crankcase As Viewed From Front End Look-
ing Toward Flywheel End.
1. Apply Quicksilver Perfect Seal to seal retainer
mating surface and apply grease to seal lips.
Index
90-823224--2 796
a
73123
b
a
73124
2. Install new seal with open end of seal inward (lip
of seal toward inside of engine), using crankcase
front cover seal installer. Drive seal in until it just
bottoms out. Do not use excessive force.
a - Crankcase Front Cover Seal Installer (J-22102)
3. Reinstall torsional damper as outlined.
Crankcase Front Cover
Removal
1. Remove engine from boat.
2. Remove torsional damper and oil pan.
3. Remove water circulating pump.
4. Remove crankcase front cover.
5. If damaged, drive oil seal out of front cover (from
the rear) using a punch.

Cleaning and Inspection

IMPORTANT: The Gen VI front cover is cast alu-
minum that has a molded o-ring style gasket.
This gasket is retained in a cast groove. It must
be replaced if damaged.
1. Clean front cover in solvent and dry with com-
pressed air.
2. Clean old gasket material and sealer from mating
surfaces on cover and cylinder block.
3. Check gasket surface on front cover for distor-
tion, and true if necessary. Surfaces must be
clean and flat or oil leakage may result.
454 CID (7.4L) / 502 CID (8.2L) - 3A-41
a
72560