34
L510023-07
Figure 28 Typical Water-Lift Muffl er Exhaust Layout
WARNING
Exhaust Systems with 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
muffl er inlet, and from the muffl er outlet to the
exhaust 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.
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
Boating industry standards (BIA, ABYC, etc.), Federal
standards, and Coast Guard regulations must be
adhered to when designing and installing exhaust
systems.
fl apper to prevent seawater from running back
into the exhaust system.
5. System must not cause excessive back
pressure. Back pressure MUST NOT exceed 4
in. (10.16 cm) of mercury when measured with
a mercury manometer at the exhaust elbow
outlets. Minimum exhaust hose sizes are given
in the chart on page 26.
6. Exhaust hoses must be connected to the engine
exhaust elbows so that they do not restrict the
fl ow of discharge water from the elbow.
NOTICE: There have been instances where the use
of water-lift muffl ers, installed close to the engine, have
caused water to be drawn back into the engine under
certain operating conditions. Crusader has in-line
damper valve assemblies available to help prevent water
ingestion problems.
If you have questions regarding the use of water-lift
muffl ers, contact Crusader Engines for clarifi cation.
In-Line Exhaust Damper Valve Kit P/N RK012023
LH Damper Tee Assembly
(4X4X5 in.) P/N 22920
RH Damper Tee Assembly
(4X4X5 in.) P/N 22921
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