Page 207 - REPOWER REFERENCE GUIDE (2020)

Exhaust Systems Installation Requirements—Inboard Applications
IMPORTANT: Complete the water intrusion test to ensure that the resonators are installed properly.

a - Exhaust resonator
f a c b - Exhaust hose
g c - Dimension to inside flat surface of
resonator 33–43 cm (13–17 in.)
d - No less than 51 mm (2 in.) between
resonator and exhaust outlet or
closest fitting
e - Hose clamp positioned around
b center of resonator for retention
f - Exhaust outlet
e g - Exhaust elbow
d

20454

a - Exhaust resonator
a c c b - Exhaust hose
f c - Dimension to inside flat surface of resonator
33‑43 cm (13‑17 in.)
g
d - No less than 51 mm (2 in.) between
resonator and exhaust outlet or closest fitting
e - Hose clamp positioned around center of
b resonator for retention
f - Exhaust outlet
e g - Exhaust elbow

d
20458
Exhaust system tuning can be affected by various factors that are beyond the control of Mercury MerCruiser. Following are
several factors that can affect exhaust system tuning:
• Type and configuration of exhaust outlet.
• Length of exhaust hose.
• Amount of back‑pressure in exhaust system.
Exhaust Shutter Assembly

Exhaust shutters are used to mitigate water flow towards the engine, or water intrusion. They can be used in gas or diesel
applications.

c c Exhaust shutter assembly
a - Rubber shutter
b - Support bar—rubber shutter
e c - Stainless steel hex head screw
b
d - Locknut
e - Steel grate
a

d d
52759
The exhaust shutter kit (8M0109256) contains two 102 mm (4 in.) exhaust shutter assemblies. Refer to the accessories guide
for additional details.

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 7D-5