Oil Pump; Removal - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23

Oil Pump

The oil pump consists of two gears and a pressure regulator valve enclosed in a two-piece
housing. Oil pump is driven by distributor shaft which is driven by a helical gear on camshaft.

Removal

1. Remove oil pan as outlined.
2. Remove gasket carefully as the one-piece gasket for the oil pan may be reused if still
3. Remove baffle.
4. Remove oil pump.
Index
90-861326--1 MARCH 1999
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3
1
2
Oil Pump Assembly
1 - Extension Shaft
2 - Shaft Coupling
3 - Pump Body
4 - Drive Gear and Shaft
5 - Idler Gear
6 - Pickup Screen and Pipe
7 - Pump Cover
8 - Pressure Regulator Valve
9 - Pressure Regulator Spring
10 - Retaining Pin
11 - Screws
pliable and not cracked, torn, etc.
a - Nuts (5)
b - Baffle
c - Oil Pump
5
6
9
8
7
10
11
4
a
b
c
454 CID (7.4L) / 502 CID (8.2L)
72277
75496
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