Westerbeke 22.0 KW EDE-60Hz Operator's Manual page 24

COOLING SYSTEM.
THERMOSTAT
A thermostat, 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 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.
LOOSEN THIS HOSE CLAMP
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 thennostat 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.
4. Re-assemble and test: Tum the cover back into place and
tighten the three screws. Do not over-tighten! Tighten the
hose clamp and tighten the drains. Top off the coolant and
run the engine. Check for normal temperature and for any
leaks around the thermostat assembly.
A
CAUTION:
The engine must be allowed to cool
down before attempting these procedures. Not only
is the surface of the engine hot but coolant
temperatures can be at 190° F.
TWIST THE
THERMOSTAT
ASSEMBLY
GASKET
#298843
APPLY SEALANT
WHEN INSTALLING
Engines
&
Generators
16
THERMOSTAT HOUSING