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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 thel.mostat 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 heaL
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
•
~ ~le ~t:
Thm the
cover
back
ffito
place
and
"...::::::::::-: r
tighten the three screws. Do not over-tighten! Tighten the
THERMOSTAT
ASSEMBLY
GASKET
SEAL WITH HI-TACK
COOLANT
TEMPERATURE
SWITCH
1~
hose clamp and tighten the drains. Top off the coolant and
run the engine. Check for normal temperature and for any
1
leaks around the thermostat assembly.
THERMOSTAT HOUSING
A
CAUTION:
The engine
~pust
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.
THERMOSTAT
HOUSING COVER
Engines
&
Generators
14
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Table of Contents
Troubleshooting
