32
L510023-07
WARNING
Exhaust Systems without Water-Lift Muffl ers
1. System layout and construction must prevent
cooling system discharge water from fl owing
back into the engine, and also must prevent
seawater from entering the engine via the
exhaust system.
2. The exhaust hoses and pipes must not be higher
than the exhaust elbow outlets at any point.
3. The exhaust system (for routing exhaust to
outside of boat) must be located so that a
minimum of 1 in. per foot (83.31 mm per meter)
downward pitch exists in the exhaust hose or
pipe from the engine exhaust elbow to the outlet,
with a minimum drop of 4 in. (100 mm) overall
(this is an ABYC recommendation). The drop
must be constant so that a low spot does not
exist at any point in the exhaust hose or pipe.
Boating industry standards (BIA, ABYC, etc.), Federal
standards, and Coast Guard regulations must be
adhered to when designing and installing exhaust
systems.
Figure 26 Exhaust Hose Connections
HOT SPOT
INCORRECT CORRECT
Figure 27 Typical Inline Muffl er Exhaust Layout
4. Exhaust outlet(s) should be slightly above the
water line with the boat at rest in the water, and
a full load onboard. Exhaust outlet(s) must be
equipped with an internal shutter and/or exhaust
fl apper to prevent seawater from running back
into the exhaust system.
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