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Automatic Shutdown
High Exhaust Temperature Shutdown Switch (normally closed)
An exhaust temperature switch is located on the exhaust elbow and will
open
the
ignition
circuit
should
the
switch
sense
excessive
tem-
perature,
indicating a lack of proper sea water coolant flow.
This
switch opens at 260 - 270·F (127 - l32·C) and resets at approximately
22S·F (107·C).
High Water Temperature Shutdown Switch (normally closed)
A high water temperature switch is located in the area of the thermo-
stat housing to sense fresh water coolant temperature and shut down
the generator should the engine fresh water coolant operating tempera-
ture reach approximately 20S· F (96·C)
+
S·.
This switch resets at
19S·F (approximate).
-
Low Oil Pressure Shutdown Switch (normally open)
A low
oil pressure
shutdown
switch
is
located
in
the
engine oil
gallery and is closed when eng ine oil pressure reaches 10 -
IS psi,
maintaining
the electr ical run circuit.
This switch will open and
shut the generator down when engine oil pressure drops to 10 - IS psi.
Exhaust Back-Pressure
Exhaust back-pressure should be checked
prior
to putting
a generator
into ser-
vice.
(Refer to the illustration.)
Ex-
cessive back-pressure will affect engine
performance and generator power output.
Measure
back-pressure
at
the
exhaust
elbow
with
generator
under
full
load.
Back-pressure
(manometer)
should not be
over 3 inches of mercury (0.104 kg/cm 2 ),
39 inches of water column (0.099) kg/cm 2
at 4·
C},
22 ounces per square inch or
1-1/2 psi (967 kg/m 2 ).
Excessive
back-pressure
can
be
by
small
diameter
exhaust
hose,
muffler,
sharp
bends,
fittings,
pockets or high volume of water
exhaust system.
Oil Drain
caused
small
water
in the
Mercury
Manometer
\
Exhaust
Elbow
/,Exhaust
An oil sump drain hose is installed on the engine with the discharge
end secured by a bracket at the front of the engine.
Oil may be
drained from this hose by removing the cap and the discharge end of
the hose from the suppor t
br acket and lower ing the hose in to a con-
tainer.
The hose cap fitting
is 1/4-NPT and can be extended, or a
pump
added,
for
easier
removal
of
oil,
if
desired.
13
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