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ENGINE MAINTENANCE - 11
INSPECT and CLEAN EXHAUST COOLING
SYSTEM THERMOSTATS - Partial Fresh System
There is a thermostat housing on the outlet side of each
exhaust manifold. Remove each raw water exhaust
thermostat housing and inspect. Clean as required. This
thermostat must be inspected and cleaned at the first 25
hour inspection. The thermostat must be inspected every
50 hours or once a year thereafter.
IMPORTANT: Thermostat housing MUST be assembled
and tightened as shown, in the vertical position. Failure
to do so may cause the thermostat to improperly seat
and result in a leak.
CLEANING SEA-WATER SECTION OF HEAT
EXCHANGER - PARTIAL FRESH-WATER
COOLED MODELS ONLY
The sea-water section of the heat exchanger should
be cleaned whenever there is a noticeable decrease in
cooling efficiency. You may use the following procedure
for cleaning, or, if the build-up of scale and mineral
deposits is heavy, it is recommended that the heat
exchanger be removed and taken to a repair facility to
be boiled out (such as a radiator repair facility).
1. Remove the bolts securing the heat exchanger
end plates. Remove the end plates and gaskets.
2. Clean the water passages in the heat exchanger
by inserting a suitable-size wire brush into each
passage. Use compressed air to blow out loose
particles.
3. Clean the gasket surfaces on the end plates and
the heat exchanger. Apply PerfectSeal to both
sides of the new gaskets. Install the end plates
and the new gaskets onto the heat exchanger.
Install the bolts and tighten securely.
4. Start the engine and inspect for leaks.
30
Figure 11-12 Exhaust Cooling System Thermostat
Housing - Partial Fresh System
HEAT
EXCHANGER
COOLANT
DRAIN PLUG
Figure 11-13 Heat Exchanger and End Plate Removal
L510010D-17
Outlet
Housing
O-Ring
Thermostat
Inlet
Housing
Water
Flow
PLATE
RAW WATER
GASKET
DRAIN PLUG
(Typical)
BOLT
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