Cleaning And Inspection - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23
IMPORTANT: Restrictor gaskets (if equipped) must be installed in order shown.
NOTE: Later models will have an open gasket (four slots) instead of a restrictor gasket (two
slots and two holes). If replacing gaskets, it is acceptable to replace the old gaskets with the
open gaskets. Be sure that the same type of gasket is used on both manifolds.

Cleaning and Inspection

1. Disassemble muffler as shown.
2. Clean (using pressurized water) and inspect parts, including filter element and O-ring
3. Reassemble as shown above. Tighten end plate screws securely.
Index
90-861326--1 MARCH 1999
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1-1/4 Inch Muffler Riser Installation
a - Exhaust Manifold
b - Exhaust Elbow
c - Bolt (4 Each Manifold)
d - Gasket - Lightly Coat Both Sides With Quicksilver Perfect Seal
e - Riser 1-1/4 Inch (32 mm) Height
f - Restrictor Gasket (Open Gasket on Later Models)
g - Refer To Note Following
a - Removable End Plate
b - 4 Screws Secure End Plate
c - O-Ring Seal
d - Element - When Reassembling, Seat Tab In Slot In Casting
seal. If required, replace O-ring, securing in place with Quicksilver Sound Blanket Glue.
c
b
f
e
d
a
a
c
d
COLLECTORS
g
72780
b
72782
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