Indmar 5.7L Vortec Operator's Manual page 52

• You can be injured if you try to work on your
marine engine without knowing enough
about your engine.
• Be sure you have the knowledge, experience
and the correct replacement parts BEFORE
you attempt any repairs.
• Be sure all fasteners you use are approved
and rated for marine use. Use of improper
parts can cause component or engine failure
which may result in death or serious person-
al injury.
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. See Chapter 7 - Storage and Winter
Lay-up. Failure to drain the cooling system
will result in severe damage to your engine
and other cooling system components.
6-2
Special maintenance procedures are required
for engines that are operated in brackish or
salt water. See the Salt Water Operation por-
tion of this chapter for details.
Never operate engine without adequate water
supply to the raw water pump. Failure to
properly cool engine will cause severe
engine damage and void your warranty.
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 min-
utes 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 condi-
tion 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 50 hours).
Indmar Marine Engines