Indmar 454 Carbureted, Operator'S Manual

Page: 58 / 92

6-10 Indmar Marine Engines
The following engine must not be operated in brackish
or salt water environments unless it is equipped with a
closed cooling system which allows the use of anti-
freeze coolant in the engine instead of raw water.
• Malibu Hammerhead 383
This engine uses aluminum cylinder heads and will be
severely damaged from salt water corrosion if operated
in brackish or salt water. See your Indmar dealer to install
a closed cooling system if you have this engine and will
operate it in brackish or salt water.
The following engines are equipped with standard closed
cooling systems from Indmar:
• Malibu LS1
• MasterCraft LQ9
These engines can be operated in fresh water or salt
water without causing damage to the internal cooling
passages in the engine. The cooling passages in the
exhaust manifolds are not part of the closed cooling sys-
tem and although they are corrosion resistant, need to
be checked periodically for damage from salt water.
The remaining 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.
External Care
Your engine has been carefully primed and painted to
protect it against rust and corrosion. To keep your engine
looking like new, Indmar recommends applying an anti-
corrosion compound, such as Pennzoil Marine Z-M
Corrosion Protectant and Lubricant. Regular application
(every 3 months) of this Protectant, particularly on
exposed metal surfaces, motor mounts and electrical
connections, will displace water and seal the surfaces
against penetration by corrosive agents. Rinsing the
engine with fresh water between applications of the
Protectant will further protect the exposed surfaces.
INTERNAL (COOLING SYSTEM) CARE
Raw Water Cooling Systems
If your engine is raw water cooled, water from whatever
body of water you are operating in is pumped through
the cooling passages of the engine, exhaust manifolds
and exhaust risers. It is critical that the salt water be
flushed from these cooling passages after use by run-
ning fresh water through the cooling system. For more
convenient flushing, ask your dealer about permanently
installing a flushing device that allows easy connection of
a water hose.
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