Indmar Marine Engines
6-11
When adding coolant, add only propylene glycol in an
appropriate mixture with distilled water in accordance
with the directions on the container. Do not overfill the
tank. Do not mix anti-freeze types.
If the cooling system is completely empty, see your
Indmar dealer for assistance immediately to purge sys-
tem. Purging the system is a difficult procedure that is
not recommended for the boat owner.
Salt and Hard Water Operation
All Indmar Marine engines are capable of operating in
brackish or salt water as well as in hard water or water
with high mineral content as long as certain precautions
and maintenance procedures are followed. Your dealer
will be aware if the local freshwater lakes in your area
will require any special precautions to keep your engine
functioning properly. Damage to the engine, both internal
and external, that is a result of inadequate salt or hard
water maintenance will not be covered under the Indmar
Limited Warranty.
The following engines must not be operated in brackish
or salt water environments unless equipped with a
closed cooling system which allows the use of anti-
freeze coolant in the engine instead of raw water.
• 6.0L – L96
• 6.2L – LS3 and LSA
These engines use aluminum cylinder heads and/or
block assemblies which will be severely damaged from
salt water corrosion if operated in brackish or salt water.
Factory-installed closed cooling systems are available for
the 6.0L and the 6.2L LS3 engines. These engines must
be ordered from the factory as closed cooled engines.
No field-installed closed cooling kits are available.
There is no closed cooling system available for the 6.2L
LSA engine. This engine is not designed to be used in
salt water.
The 5.7L Indmar engines will tolerate occasional use in
salt water but it is recommended that if the engine will be
used in salt water more that 25% of the time that the
engine be equipped with a closed cooling system.
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