Mercury MerCruiser MCM 454 Mag MPI Service Manual page 914

SERVICE MANUAL NUMBER 23
4. As needed, depending on use conditions, remove mufflers, then remove four screws
5. Reinstall muffler end plate with four screws. Tighten securely.
6. Reinstall muffler into tubes/hoses. Double clamp. Tighten securely.
7. Check area around exhaust elbow and riser gaskets for leakage. Replace gaskets, if
Water must be completely drained from exhaust elbow riser during freezing temper-
atures, or water may freeze and cause severe damage to riser.
Index
90-861326--1 MARCH 1999
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securing forward end plate, and remove end plate and element and interior of muffler.
Clean thoroughly, at least once each year, using pressurized water.
a - Removable End Plate
b - 4 Screws Secure End Plate
c - O-Ring Seal
d - Element - When Reassembling, Seat Tab In Slot In Casting
a. Check condition of O-ring seal; if dried out or shrunk below mating surface, remove
and replace. Clean groove thoroughly.
b. Glue new O-ring seal in groove, using Sound Blanket Glue. Wipe off excess glue
immediately.
necessary.
b
a
c
d
CAUTION
COLLECTORS
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