Torque Specifications; Lubricants / Sealants / Adhesives; Removal - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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MANIFOLDS AND ELBOWS

Torque Specifications

Exhaust Elbow

Exhaust Manifold

Quicksilver Perfect Seal

Avoid possible injury or damage to equipment should wires be accidentally

shorted. Disconnect BOTH battery cables from battery before proceeding.

1. Disconnect battery cables from battery.

To avoid severe engine damage. Exhaust elbows and manifolds MUST BE drained

to prevent water (or coolant) from entering combustion chambers when exhaust

elbows are removed.

2. Drain water from manifold and exhaust elbow. Refer to SECTION 1B.

3. Disconnect exhaust bellows and cooling hoses.

4. Starboard Manifold:

a. Disconnect both shift cables (MCM only).

b. Disconnect instrument harness plug from engine harness, if mounted on exhaust

c. Remove shift plate assembly from exhaust elbow (MCM only).

d. Remove bolt holding bracket for Quicksilver Water Separating Fuel Filter to exhaust

5. Port Manifold:

a. Remove remote oil filter and bracket.

b. Remove components from exhaust elbows (if necessary).

6. Remove exhaust elbow.

NOTE: Later models will have an open gasket (four slots) instead of a restrictor gasket (two

slots and two holes). If replacing gaskets, it is acceptable to replace the old gaskets with the

open gaskets. Be sure that the same type of gasket is used on both manifolds.

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Fastener Location

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

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