Rocker Arm Cover; Removal; Installation; Intake Manifold - MerCruiser 454 MAGNUM Manual

Rocker Arm Cover

Removal

On Engines with Center Exhaust Outlet Exhaust
Manifolds: It may be necessary to remove exhaust
manifold before removing rocker arm cover. Refer to
Section 7B for removal. Also remove any component
that will interfere with the removal of the manifold.
1. Disconnect crankcase ventilation hoses.
2. Remove any items that interfere with the removal
of rocker arm covers.
3. Remove rocker arm cover.

Installation

1. Clean sealing surfaces on cylinder head and
rocker arm cover with degreaser.
2. Place new rocker arm cover gasket in position in
rocker arm cover.
a
a - Rocker Arm Cover Gasket
3. Install rocker arm cover. Torque bolts to 70 lb. in.
(10 N·m).
4. Reinstall exhaust manifolds, if removed.
5. Reinstall any items which were removed to allow
removal of rocker arm covers.
6. Connect crankcase ventilation hoses to rocker
arm covers.
7. Start engine and check for oil leaks.
Index
3A-22 - 454 C.I.D. (7.4L) / 502 C.I.D. (8.2L)

Intake Manifold

For repair procedures on Fuel Injection
Engines, refer to Section 5C.
Removal
1. Drain engine cooling system.
2. Disconnect hoses from thermostat housing.
3. Disconnect intake manifold-to-circulating pump
by-pass hose from circulating pump.
4. Disconnect electrical leads interfering with re-
moval.
5. Disconnect crankcase ventilation hoses from
rocker arm covers.
6. Disconnect throttle cable from carburetor. Re-
move fuel line and sight tube running between
fuel pump and carburetor.
7. Remove distributor cap and mark position of rotor
on distributor housing. Also, mark position of dis-
tributor housing on intake manifold. Remove dis-
tributor.
IMPORTANT: Do not crank engine over after dis-
tributor has been removed.
8. Remove other ignition components.
9. Disconnect any other miscellaneous items that
will prevent removal of manifold.
IMPORTANT: It may be necessary to pry intake
manifold away from cylinder heads and block, in
next step. Use extreme care to prevent damage to
72928
sealing surfaces.
10. Remove intake manifold bolts, then remove in-
take manifold and carburetor assembly.
NOTE:If intake manifold requires replacement,
transfer all remaining parts to new manifold.

Cleaning and Inspection

1. Clean gasket material from all mating surfaces.
IMPORTANT: When cleaning cylinder head mat-
ing surface, do not allow gasket material to enter
engine crankcase or intake ports.
NOTICE
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