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Excessive back-pressure can
be
caused by a small diameter exhaust
hose, a small muffler, sharp bends
in the exhaust hose, improper fit·
tings, water pockets, and a high
volume of water in the exhaust sys-
tem 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 restric-
tions and contribute to exhaust
back-pressure. The generator's ex·
haust system
cmmt.
be separate
from any other engine's exhaust
system. Dry portions of the exhaust
system between the engine's ex-
haust manifold and the water in-
jected exhaust elbow
mIJ.S1.
be
insulated to hold in the heat.
DRY STACK EXHAUST
Dry stack·type exhaust systems (shown above)
tr.I.I.m1. be
attached to the generator engine's exhaust manifold
by means of a flexible connector pipe. This system
~be
property supported and insulated to prevent
water from entering into the engine's cylinders. Provisions
CIJ.USt. be
made for discharging the engine's raw
cooling water.
Exhaust Back-Pressure
The exhaust discharge hose
~
be of adequate size and
minimal run to prevent excessive exhaust back-pressure.
Exhaust back-pressure should be checked before a gener-
ator is put into service. (Refer to the illustration.) Excessive
back-pressure will affect the engine's performance 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 its
exhaust elbow, one
must.
be drilled and tapped for a 1/8 inch
NPT fitting 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.
Refer to the pressure specifications listed on the following
page.
Westerbeke Generators
16
Exhaust
Elbow
Exhaust
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