35
L510032-16
ENGINE MAINTENANCE - 11
CLEANING SEA-WATER SECTION OF HEAT
EXCHANGER - SALT SERIES MODELS ONLY
The sea-water section of the heat exchanger should
be cleaned whenever there is a noticeable decrease in
cooling eciency. 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
FILLING FRESH-WATER COOLING SYSTEM
(Salt Series Applications)
Your engine may contain one of two dierent antifreeze
solutions in its cooling system.
DEX-COOL™
• IT IS PINK IN COLOR TO DISTINGUISH IT
FROM CONVENTIONAL COOLANT.
• THE SERVICE CHANGE INTERVAL ON
ENGINES BUILT WITH DEX-COOL™ IS 5
YEARS.
• TO MAINTAIN FULL CORROSION
PROTECTION DURABILITY, DEX-COOL™
MUST NOT BE MIXED WITH CONVENTIONAL
(CONTAINING SILICATE) ENGINE COOLANTS.
• DEX-COOL™ IS AN ETHYLENE GLYCOL
BASED PRODUCT, THEREFORE, BOIL AND
FREEZE PROTECTION ARE MEASURED IN
THE SAME FASHION AS CONVENTIONAL
COOLANTS.
TO FULLY REALIZE ITS MANY ADVANTAGES,
DEX-COOL™ MUST NEVER BE MIXED WITH
CONVENTIONAL COOLANTS.
DEX-COOL™ can become contaminated by
inadvertently topping-o with conventional coolant,
adding conventional coolant to the system or even if
ll/drain containers are shared between coolants. If
contamination occurs, the cooling system must be
immediately drained and ushed, and relled with DEX-
COOL™. No short-term damage will occur, however,
the service interval will be reduced from 5 years to 2
years.
SIERRA
• IT IS GREEN IN COLOR.
• 100% PHOSPHATE FREE
• PROPYLENE GLYCOL FORMULATION
MAKES IT SAFER FOR PEOPLE AND THE
ENVIRONMENT
• SHOULD BE CHANGED EVERY 2 YEARS
The fresh-water cooling side of the cooling system must
be lled with a 50/50 mixture of antifreeze and water
solution.
IMPORTANT: More than 50% antifreeze solution can
contribute to an overheating condition.
IMPORTANT: If the engine is being placed in winter
storage, the fresh-water cooling section must be lled
with a correct type of coolant and water solution,
properly mixed, to protect the engine to the lowest
temperature to which it will be exposed.
1. Make sure that all drain plugs are properly
installed.
2. Remove the pressure cap. Fill the system with
antifreeze solution until the system is lled.
See ENGINE FLUID CAPACITIES for system
capacities.
3. Start the engine and operate at idle speed (1200-
1500 RPM) to purge any air from the system.
When the system is full, install the pressure cap.
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