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Westerbeke WPDS-20 Instrukcja Operatora Strona 10

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Exhaust
Back-Pressure
The exhaust discharge hose must be
of
adequate size and
minimal run
to
prevent excessive exhaust back-pressure.
Exhaust back-pressure should
be
checked before the engine
is
put into service. (Refer
to
the illustration.) Excessive back-
pressure will affect the engine's performance.
To measure
for
back-pressure, use a mercury manometer, a
pressure gauge,
or
a water column. A boatyard
or
marine
mechanic should have a manometer
or
a pressure gauge.
Measure back-pressure at the exhaust elbow when the en-
gine is running at
3000 rpm. Back-pressure, as measured by
a manometer, a pressure gauge,
or
water column, should not
be over the following specifications:
NOTE: Other pressure gauges may be available
to
test
for
exhaust back-pressure. Check with a competent
mechanic.
Refer
to
the pressure specifications below.
A water column can
be
made by taking a clear plastic tube
and taping one end
of
the tube along a yardstick and fitting
the other end
of
the tube with a 1/4 inch NPT (National Pipe
Tap) pipe fitting.
Measure back-pressure at the exhaust elbow when the en-
gine
is
running at 3600 rpm.
Dimension A cannot exceed 39 inches
of
water.
Back pressure, as measured by a gauge instrument, should
not exceed the following specifications:
3 inches
of
mercury (0.104 kg/cm
2
)
39 inches of water in a water column
(.099 kg/cm
2
at
4'
C)
22 ounces psi
1 1/2 psi
..
..
"
"
"
."
"
. "
I •
Mercury
Manometer
\
Exhaust
Elbow
Exhaust
Excessive back-pressure can be caused by a small diameter exhaust hose, a small muffler, sharp bends in
the exhaust hose, improper fittings, water pockets, and a high volume of water in the exhaust system due
to
the length
of
the exhaust discharge hose. The use
of
elbows and fittings in the exhaust discharge hose's
routing should be limited since these will create flow restrictions and contribute
to
exhaust back-pressure.
The engine's exhaust system must
be
separate from any other engine's exhaust system. Dry portions of the
exhaust system between the engine's exhaust manifold and the water injected exhaust elbow must be insu-
lated
to
hold in the heat.
Westerbeke Diesel
Engines
16
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