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L510010-11
ENGINE MAINTENANCE - 11
CLEANING SEA-WATER SECTION OF HEAT
EXCHANGER - FRESH-WATER COOLED
MODELS ONLY
The sea-water section of the heat exchanger should
be cleaned whenever there is a noticeable decrease in
cooling effi ciency. 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.
Figure 11-13 Heat Exchanger and End Plate Removal
(Typical)
HEAT
EXCHANGER
COOLANT
DRAIN PLUG
RAW WATER
DRAIN PLUG
GASKET
PLATE
BOLT
11. Return the degass bottle to the
lower, or running position. Make
sure the bottle level is at the
“Min” mark on the bottle and
tighten the cap.
Lower Location
Upper Location
Important: If a heater is used, the complete heater system, hoses and core, should be prefi lled by either pumping or
sucking Dexcool through the system. Once the heater system is prefi lled, the hoses can be attached to the ball valves
and the ball valves need to be opened.
Once the system has heated up and cooled down, it is not uncommon to have to add a little bit of coolant after the fi rst
couple of heat cycles.
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