Inspection; Installation - MerCruiser GM4 Service Manual

3. Remove MCM coupler.
4. Remove flywheel.
Alpha One Coupler

Inspection

1. Inspect splines in coupler for wear.
2. Check flywheel ring gear for worn and missing
teeth.

Installation

1. Clean mating surfaces of flywheel and crank-
shaft. Remove any burrs. Mating surfaces must
be clean bare metal.
2. Aligning dowel hole in flywheel with dowel in
crankshaft, install flywheel. Torque bolts to 75 lb.
ft. (100 N · m).
3. Check flywheel runout as follows:
a. Attach a dial indicator to engine block.
b. Take readings around outer edge of flywheel.
Push in on flywheel to remove crankshaft end
play.
Index
90-816462 2-695
c. Maximum runout - .008 in. (0.203 mm).
b
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a - .008 in. (0.203 mm) Max. Runout
b - Push Flywheel and Crankshaft Forward as Far as It Will Go
when Taking Reading
4. Insert three rubber bumpers in Alpha coupler be-
fore installation on flywheel.
a
a - Rubber Bumper
5. Install drive coupler. Torque bolts to 35 lb. ft. (48
N·m). If reusing screws, use Loctite 8831.
6. Install flywheel housing and related parts. Torque
bolts to 30 lb. ft. (41 N·m).
7. Install flywheel housing cover. Torque bolts to 80
lb. in. (9 N·m).
8. Refer to SECTION 2 "Removal and Installation"
and install engine.
a
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ENGINES - 3A - 27