Mercury MerCruiser MCM 454 Mag MPI Service Manual page 121

SERVICE MANUAL NUMBER 23
Exhaust hoses must be connected to exhaust elbows so that they do not restrict
the flow of discharge water from exhaust elbow. If hoses are connected incorrectly,
discharge water from exhaust elbow will not flow around entire inside diameter of
hose. This will cause a hot spot in the hose which may eventually burn through.
Index Index
90-861326--1 MARCH 1999
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b. On Engines with Through-Transom Exhaust:
NOTICE (Through Transom Exhaust)
Correct
c. On Engines with Silent Choice Exhaust System:
a - Silencer Valve
b - Exhaust Hose And Clamps For Through Transom
c - Exhaust Hose And Clamps For Intermediate Exhaust Pipe
d - Exhaust Hose And Clamps For Exhaust Pipe
MCM MODELS - BRAVO AND BLACKHAWK DRIVES
Incorrect
c
a
b
d
72538
72539
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