GASOLINE ENGINES SKI MODELS
Page 9 of 48
Exhaust System
IMPORTANT: It is the responsibility of the boat manufacturer, or installing dealer, to
properly locate the engine and install the exhaust system. Improper installation may
allow water to enter the exhaust manifolds and combustion chambers and severely
damage the engine. Damage caused by water in the engine will not be covered by
MerCruiser Warranty unless this damage is the result of defective part(s).
Determine if exhaust elbow risers are required by taking measurements “a” and “b” with boat
at rest in the water and maximum load aboard. Subtract (b) from (a) to find (c). If (c) is less
than specified in chart, select appropriate size exhaust elbow riser kit, and exhaust exten-
sion kit if applicable, that will correctly position exhaust elbow.
Model
(c) = (a) Minus (b)
All Models (c) Must Be 13 in.
(330 mm) or More
22457
b
c
d
a
Typical Installation Shown
a-From Waterline To Top Of Transom
b-From Highest Point On Exhaust Elbow To Top Of Transom
c-Equals (a) Minus (b)
d-Waterline At (c) Rest
• System must not cause excessive back pressure when measured at exhaust elbow out-
lets. Back pressure MUST NOT exceed 2 psi (14 kPa). Minimum exhaust hose sizes
are given in chart:
Minimum Exhaust Outlet Hose Size
3-1/2 in. (88.9 mm)
• Exhaust hoses must be secured at each connection with two (2) hose clamps.
• Exhaust hoses must be connected to exhaust elbows so that they do not restrict the flow
of discharge water from the elbow. If hoses are connected incorrectly, a hot spot in the
hose can occur and can eventually burn through.
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.
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