Thermostat - Westerbeke 8.0KW BCDT60Hz Owner's Manual

COOLING SYSTEM
NOTE: Periodically check the condition of the manifold
pressure cap. Ensure that the upper and lower rubber seals
are in good condition and check that the vacuum valve opens
and closes tightly. Carry a spare <:ap.
INSPECT SEAL
THERMOSTAT
A thermostat, located near the manifold at the front of th~
engine, controls the coolant temperature as the coolant
continuously flows through the closed cooling circuit. When
the engine is first started, the closed thermostat prevents
coolant from flowing (some coolant is by-passed through a
hole in the thermostat to prevent the exhaust manifold from
overheating). As the engine warms up, the thermostat
gradually opens. The thermostat is accessible and can be
checked, cleaned, or replaced easily. Carry a spare thermostat
and gasket.
Replacing the Thermostat
Remove the cap screws and disassemble the thermostat
housing as shown. When installing the new thermostat and
gasket, apply a
thin
coat of sealant on both sides of the
gasket before pressing it into place. Do not over-tighten the
cap screws.
Run the engine and check for normal temperatures and that
there are no leaks at the thermostat housing.
HIGH WATER
TEMPERATURE .>-------lS~::.;:..~
SWITCH
!
THERMOSTAT ASSEMBLY
COOLANT TEMPERATURE SWITCH
The coolant temperature switch is located near the thermostat
housing (see illustration). If the coolant's operating temperature
reaches approximately 210
0
F (99
0
C) this switch will light up the
red (LED) engine overheat indicator on the control panel and shut
down the generator.
AIR COOLING
Cooling air is continuously circulated (by air hose) thru the con-
trol panel and around to the engine air intake where it passes thru
a filter into the engine.
INCOMING
• COOLING AIR
RAW WATER COOLING
CIRCUIT~
."
.
. V·::
~FROM
RAW
}·TrVATER PUMP.
The raw water flow is created by a positive displacement
impeller pump. This pump draws water directly from the
raw water source (ocean, lake, or river) through a hose to
the water strainer. The raw water passes from the strainer
through the raw water pump to the water cooled generator
and then to the heat exchanger. The raw water passes
thru
the heat exchanger tubes where it cools the circulating fresh
water (coolant). The raw water is then discharged into the
water-injected exhaust elbow, mixing with and cooling the
exhaust gasses. This mixture of exhaust gas and raw water
is discharged overboard by the engine's exhaust gas
discharge pressure.
Engines
~
Generators
19