MANIFOLDS, ELBOWS AND RISERS SERVICE MANUAL NUMBER 22
Page 7B-8 90-860074--1 FEBRUARY 2002
Locating and Installing The Sterndrive (MCM) 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
Mercury MerCruiser Warranty, unless this damage is the result of defective parts.
Determine if an exhaust riser kit or a water lift muffler kit is 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, an exhaust riser kit must be installed.
The Sterndrive (MCM) engine is equipped with a factory installed exhaust riser. Verify
that the riser provides the required dimension “c”, or a distance greater than “c”, as
indicated.
Model “c” = “a” Minus “b”
All Models “c” Must Be 11 in. (279 mm) or More
b
d
a
74298
c
a
b
c
d
Typical Sterndrive (MCM) Engine
a - From Waterline To Top Of Transom
b - From Highest Point On Exhaust Elbow To Top Of Transom
c - From “a” Minus “b”
d - Waterline At Rest
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