Operator`s manual

Generator BeloN Water Line
The exhaust discharge from the water lift muffler should be routed well above the water line then downward
to the thru-hull discharge. This routing will prevent sea water from entering if the thru-hull discharge fitting
becomes submerged when the vessel heels
or rolls while underway, or is subjected to following sea condi-
tions. Refer
to the figures for recommended exhaust system installations.
Exhaust Back-pressure
Exhaust back-pressure should be checked prior to
putting a generator into service. (Refer to the illustra-
tion.) Excessive back-pressure will affect the engine's
~
performance and the generator's power output. ~
To measure the engine's back-pressure, either a mer- ~.
cury manometer or a water column must be acquired.
A
boatyard or marine mechanic should have a . .. .
manometer. A water column can be made by taking ~/4
a clear plastic tube and taping one end to a yardstick NPT
and fitting the other end with a 1/4 inch NPT (Nation-
al Pipe Tap) fitting. Fill the tube half-full with water. If
your generator set does not have a tapped hole in its
exhaust manifold, one must be drilled and tapped
for
a 1/4-inch NPT fitting.
Measure baCk-pressure
at the exhaust elbow when
the generator is under a full load. Back-pressure, as
measured
by a manometer or water column, should
not be over the following specifications:
9
48
3S
38
2S
28
-Insulation
\
Exhaust
Elbow
Exhaust