Installation; Maintenance Instructions - Mercury MerCruiser MCM 454 Mag MPI Service Manual

COLLECTORS

Installation

1. Install muffler, as shown, into exhaust hose and molded tube. Fabricate muffler to tran-
som using 4-inch I.D. exhaust hose, cut to required length.
NOTE: Removable end of muffler ALWAYS goes toward exhaust elbow. This places direc-
tion marks on muffler body casting at the upper rear corner on the port side.
IMPORTANT: A MOLDED exhaust tube MUST be used at exhaust elbow connection
to maintain positive separation of exhaust outlet and muffler inlet.
2. Double clamp each connection. Tighten each clamp securely.
IMPORTANT: After starting engine, check installation for leaks.

Maintenance Instructions

Maintenance inspection is owner's responsibility and must be performed at intervals speci-
fied in owner's Operation and Maintenance Manual.
1. Check exhaust elbow attaching nuts for adequate tightness [20-25 lb. ft. (27-34 N·m)].
2. Check hose clamps for adequate tightness.
3. Periodically check tubes/hoses for soft spots, brittleness, cracks, and general condition.
Replace as necessary.
Index
Page 7D-14
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c
d
a - Muffler
b - Molded Exhaust Tube - Muffler To Elbow
c - Exhaust Hose - Muffler To Thru-Transom Fitting - Cut To Length
d - Double Clamp Each Connection (Not Shown On Hose C)
a
b
d
SERVICE MANUAL NUMBER 23
72783
72781
90-861326--1 MARCH 1999