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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 a generator is put into service (figure 3.15.1)
Excessive back-pressure will affect the engine's per-
formance which affects generator AC power output.
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.
If the generator set does not
have a tapped hole in
~s
exhaust elbow, one
II!!.&:
be drilled and tapped for a 1/8 inch NPT
f~ing
in the
dry area of the elbow.
Measure the engine's back-pressure at the exhaust
elbow while the generator is under a full-load.
.. ..
"
"
-Insulation
Exhaust
Elbow
H
Exhaust
,n
..
~ ~I
Mercury
Manometer
Refer to the pressure specifications listed below.
\
A water column can be made by taking a clear plastic figure 3.15.1:
Exhaust Elbow Connections
tube and taping one end of the tube along a
yardstick and fitting the other end of the tube
w~h
a 1/8 inch NPT (National Pipe Tap) pipe fitting.
Measure the engine's back-pressure in the dry "--.
area of the exhaust elbow while the generator is
under a full-load.
NOTE:
Dimension
A
(figure 3.15.5)
cannot exceed 27 inches of water.
Back pressure, as measured by a gauge instru-
ment, should not exceed the following specifica-
tions:
15.0KW BTDA
2 inches of mercury
27 inches of water in a water column
15.6 ounces psi
1.0 psi
1.11 kg/cm 2
26
1/8
NPT Plug
\
Westerbeke Generators
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Table of Contents
Troubleshooting
