Thermostat - Westerbeke 29.0 EGED 60Hz Operator's Manual

COOLING SYSTEM
THERMOSTAT
A thennostat, located near the manifold at the front of the
engine, controls the coolant temperature as the coolant
continuously flows through the closed cooling circuit.
When the engine is first started, the closed thermostat pre-
vents coolant from flowing (some coolant is
by~passed
through a bole 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
1. Drain off some coolant: Release the coolant pressure cap ·
and drain the coolant
to
the approximate level off the ·
thermostat housing. This can be done using the heat
exchanger drain plug.
2. Rotate the thermostat assembly: Loosen the hose clamp
as shown and remove the three allen screws that hold
down the thermostat housing cover, the assembly can now
be twisted enough to access the gasket and thermostat.
3. Remove/replace the gasket and thermostat: When
installing the new parts, apply a thin coat of sealant on
both side of the gasket before pressing it into place.
HEAT
EXCHANGER
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THERMOSTAT
ASSEMBtY
GASKET
SEAL WfTHHI-TACK
#052946
COOLANT
TEMPERATURE
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. . . . . . . . : : : : : : : - : - r
tighten the three screws. Do not over-ti.ghten! Tighten the
l~
bose clamp and tighten the drains. Top off the coolant and
· run the engine. Check for normal temperature and for any
· leaks around the thennostat assembly:
1 . .
THERMOSTAT HOUSING
A
CAUTION:
The e1111ine lfiUSI be allowed to cool
down before attempting these procedures. Not DIJ.IY
is the surface of the engine hot but coolant
temperatures can be at 190• F.
Engines
&
Generators
15