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SECTION SEVEN
duty for extended, high RPM duty. If you perform minor
service procedures, make sure to use genuine Indmar
parts for marine use.
NOTICE
If the temperature falls below the freezing point (32°F,
0°C) the raw water portion of your engine's cooling
system must be drained. Refer to Section 8, Storage and
Winter Lay-Up. Failure to drain the cooling system will
result in severe damage to your engine and other cooling
system components.
NOTICE
Special maintenance procedures are required for
engines that are operated in brackish or salt water. Refer
to "Salt and Hard Water Operation" in this section for
details.
NOTICE
Never operate engine without adequate water supply.
Failure to properly cool engine will cause severe engine
damage and void your warranty.
7-2
Special Note for Boats Operating on Small Ski Lakes
Some operators choose to use their boats exclusively
on small ski lakes where they never get an opportunity
to run their engines for extended amounts of time (15
minutes or more) in the upper RPM range (above 4000
RPM). Many of these engines are also exposed to
extended periods of idling RPM below 1000.
Boats used in these conditions often have engines
that may suffer from fuel dilution of the motor oil. This
condition is commonly referred to as "making oil"
because the oil level on the dipstick appears to rise over
time. Boats that are operated in these severe conditions
will be required to have more frequent oil and filter
changes (every 25 hours instead of every 75 hours).
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