Important Service Information; Pump Pulley Replacement - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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SERVICE MANUAL NUMBER 23

4. Use 5/16 in. socket and tighten adjusting stud until the correct deflection (1/4 in.) of the

5. While holding adjustment stud at the correct belt tension, tighten 5/8 in. locking nut.

Important Service Information

NOTE: Serpentine belt pulley requires a special puller tool. See your local automotive repair

dealer for appropriate tool or use Snap-On P/N CJ124A.

1. Install appropriate puller on end of pulley and shaft as shown.

2. While holding tool with suitable wrench, turn threaded screw until pulley is removed.

INSTALLATION

Install pulley, using appropriate pulley installation tool as follows:

1. Place pulley on pump shaft.

2. Thread stud all the way into pump shaft. Place bearing over stud.

3. Thread nut onto shaft. Thread tool shaft (and nut) all the way onto stud (threaded into

90-861326--1 MARCH 1999

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belt is obtained at location specified above.

Typical Puller

Serpentine Pulley

pump shaft).

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