Valve Stem Oil Seal / Valve Spring; Removal - Head Installed - Mercury MerCruiser MCM 454 Mag MPI Service Manual

454 CID (7.4L) / 502 CID (8.2L)

Valve Stem Oil Seal / Valve Spring

Removal - Head Installed

1. Remove:
a. Rocker arm cover.
b. Spark plug of affected cylinder.
c. Rocker arm assembly.
2. Install air line adaptor tool (J-23590) in spark plug hole and apply compressed air to hold
valves in place.
3. Using valve spring compressor as shown, compress valve spring and remove valve
locks.
4. Slowly release valve spring compressor. Remove cap, shield, and valve spring.
IMPORTANT: Maintain air pressure in cylinder while springs, caps, and valve locks
are removed or valves will fall into cylinder.
5. Remove oil shields from valve stems.
Index
Page 3A-36
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b
a - Valve Spring Compressor (J-5892)
b - Rocker Arm Nut
a
a - Valve Stem Oil Shield
a
SERVICE MANUAL NUMBER 23
72516
72149
90-861326--1 MARCH 1999