Front Cover; Removal; Cleaning; Inspection - Mercury MerCruiser MCM 454 Mag MPI Service Manual

454 CID (7.4L) / 502 CID (8.2L)

Front Cover

Removal

1. Remove engine from boat.
2. Remove torsional damper.
3. Remove oil pan.
4. Remove water circulating pump.
5. Remove front cover.
6. If damaged, drive oil seal out of front cover (from the rear) using a punch.

Cleaning

1. Clean front cover in solvent and dry with compressed air.
2. Clean old gasket material and sealer from mating surfaces on cover and cylinder block.

Inspection

IMPORTANT: The front cover is cast aluminum that has a molded o-ring style gasket.
This gasket is retained in a cast groove. It must be replaced if damaged.
1. Check gasket surface on front cover for distortion, and true if necessary. Surfaces must
be clean and flat or oil leakage may result.

Installation

1. Install oil seal in cover with lip of seal toward inside of engine, using crankcase front
cover seal installer. Support cover around seal area with appropriate tool as shown.
2. Coat both sides of front cover gasket with Quicksilver Perfect Seal and place in position
on engine.
3. Install front cover, making sure holes in cover align with dowel pins in block. Torque front
cover attaching bolts to 89 lb-in. (10 Nm).
4. Install oil pan.
5. Install torsional damper.
6. Install water circulating pump.
7. Reinstall engine in boat.
Index
Page 3A-56
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a - Crankcase Front Cover Seal Installer (J-22102)
SERVICE MANUAL NUMBER 23
a
90-861326--1 MARCH 1999
72945