Page 215 - REPOWER REFERENCE GUIDE (2020)

Exhaust Systems Installation Requirements—Inboard Applications
Collector and Water Lift Muffler

e f

c

g
b i
h
d
k

a

j 15636

Typical
a - Waterline
b - Siphon break (vacuum valve) must be installed in cooling water circuit if exhaust elbows are at or below water level. Refer
to muffler manufacturing recommendations.
c - Exhaust back pressure check point
d - Resonator
e - 46 cm (18 in.) minimum between exhaust elbow and collector
f - 10° downward slope minimum
g - 3° downward slope minimum
h - Collector
i - 38.1 cm (15 in.) minimum exhaust elbow height with maximum load
j - Drain fitting
k - External flappers

S‑Pipe Used With Water Lift Muffler

a - Waterline
b b - 38.1 cm (15 in.) minimum exhaust
elbow height with maximum load
c - Drain plug

a
c 7556

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 7D-13