Belt Routing; Serpentine Belt Adjustment - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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Belt Routing

MCM (Sterndrive) Models

IMPORTANT: If a belt is to be reused, it should be installed in the same direction of

rotation as before.

1. Remove drive belt as follows:

NOTE: The upper, right (starboard) idler pulley is the belt adjustment pulley.

a. Loosen 5/8 in. locking nut on adjustment stud.

b. Turn adjustment stud and loosen belt. Remove belt.

2. Install drive belt on pulleys and adjust tension as follows:

3. Loosen 5/8 in. locking nut on adjustment stud. Leave wrench on adjustment stud.

NOTE: Belt deflection is to be measured on the belt at the location that has the longest dis-

tance between two (2) pulleys. Normally this location is between the power steering pump

and the belt adjustment pulley. This location will be different on engines with closed cooling

or models without power steering.

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Adjustment Stud

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

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