Flywheel Housing/Output Shaft Housing Repair (Mcm Sterndrive Models); Disassembly; Reassembly - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23
Flywheel Housing/Output Shaft Housing Repair (MCM
Sterndrive Models)
The following repair procedure requires removal of the drive shaft. In most cases,
because of engine compartment space limitations, the engine also must be
removed.
Removal and Installation
1. Remove drive shaft as outlined following in this section.
2. If engine must be removed, refer to appropriate instructions in SECTION 2, "Removal

Disassembly

IMPORTANT: This disassembly procedure, beginning with Step 1, assumes that en-
gine does not require removal from boat. If engine removal is required, refer to SEC-
TION 2 for "Removal and Installation" instructions. With engine removed from boat,
proceed with disassembly, beginning with Step 3.
1. Support rear of engine with overhead hoist or wooden blocks under the rear of the
2. Remove stringer bolts (rear engine mounts).
3. Remove output shaft housing attaching screws, then remove housing.
4. Remove snap ring, then pull output shaft out of housing.
5. Remove snap ring from housing.
6. Using Quicksilver Slide Hammer Puller, remove bearing from housing.
7. Remove flywheel cover.
8. Remove flywheel housing.
9. Remove engine coupling.
10. Clean and inspect all parts. Replace any damaged parts.

Reassembly

1. Install engine coupling. Torque to 35 lb. ft. (48 N·m).
2. Install flywheel housing. Torque to 30 lb. ft. (41 N·m).
3. Using new gasket, install flywheel cover. Tighten screws securely.
IMPORTANT: Groove in outside diameter of ball bearing must align with grease fitting
hole.
4. Install ball bearing into output shaft housing, then install snap ring.
5. Apply Quicksilver 2-4-C Marine Lubricant With Teflon to O-rings (on output shaft), then
6. Apply Quicksilver Engine Coupler Spline Grease to splines on output shaft.
7. Install output shaft housing to flywheel housing. Torque screws to 30 lb. ft. (48 N·m).
8. Secure rear engine mounts to stringer with bolts. Tighten securely.
9. Remove hoist (or wooden blocks).
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
and Installation."
engine.
slide shaft through bearing. Secure shaft with snap ring.
DRIVE SHAFT / PROPELLER SHAFT MODELS
NOTICE to INSTALLER
Page 8F-3