Mercury MerCruiser 8.1S - Page 15

GASOLINE ENGINE 8.1 S INBOARD MODELS
Page 15 of 58
NOTE: A kit is available, when applicable, to reduce from the 4 in. (102 mm) to 3 in. (76 mm).
Refer to the Quicksilver Accessories Guide, for kit part number.
71774
a
d
b
c
Typical Continuously Sloping Exhaust Line
a-Exhaust Elbow
b-Exhaust Hose Or Pipe
c-Muffler (If Equipped)
d-Waterline
71775
g
f
d
b
e
a
c
Typical Waterlift Muffler Exhaust System
a-Vent Line [1/4 in. (6 mm)]
b-Transom
c-Water Line
d-Exhaust Hose
e-Drain Valve
f-Water Lift Muffler
g-Exhaust Elbow
CAUTION
Avoid severe engine damage. A 1/4 in. (6 mm) vent hose must be run from the high-
est point in the seawater system to the exhaust pipe after the water lift muffler to
break the vacuum and prevent water from back-filling the engine.