Crankcase Front Cover/Oil Seal; Oil Seal Replacement (Without Removing Front Cover); Crankcase Front Cover - Mercury 305 CID Service Manual

Crankcase Front Cover/

Oil Seal
Oil Seal Replacement
(Without Removing Front Cover)
IMPORTANT: The following information refers to
all engines except Gen+ Engines. Crankcase
front cover is not reusable per G.M. Specifica-
tion. It must be replaced if removed.
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.
b
a
Front Seal WITHOUT Helical Grooves
a - Can Be Used on Any Rotation Engine
b - Seal Lip Toward Inside of Engine
c
a
a - MCM and MIE (LH) Rotation Engines
Index
90-823225--1 1096
73123
d
73124
c
b
b - MIE (RH) Rotation Engines
c - Seal Lip Toward Inside of Engine
d - Rotation of Crankshaft as Viewed from
Front End Looking Toward Flywheel End
Front Seals WITH Helical Grooves
1. Apply Quicksilver Perfect Seal to seal retainer
mating surface and apply grease to seal lips.
2. Install new seal with open end of seal inward, us-
ing crankcase front cover seal installer. Drive
seal in until it just bottoms out. Do not use exces-
sive force.
a - Crankcase Front Cover Seal Installer (J-35468)
3. Reinstall torsional damper as outlined.
d
73125
a
72347
ENGINES - 3A-47