Open Cooling System; Closed Cooled System - ILMOR MV8 Owner's Manual

SECTION 2 ILMOR MV8 OWNER'S MANUAL
2-4
NOTICE: Any exposure to brackish or salt water requires a closed
cooling system. Operating your open cooled engine in brackish or salt
water can and will void your warranty.

Open Cooling System

The open cooling system was designed for fresh water use only. Whenever
the boat is operated in brackish or salt water, particular care, without
fail, must be taken to flush the system with fresh water after every use.
However, even if boating in salt-free, apparently clean fresh water, flushing
the cooling system following use is recommended. This helps eliminate
marine growth or fouling of the cooling system.
In an open cooling system, raw water is drawn into the boat by the
raw water pump. (The intake is on the back of the boat where it will be
submerged and can draw water continuously; the pump is located on the
engine block.)

Closed Cooled System

The closed cooled system is the required application for boats operating
in consistently brackish or salt water. The system provides maximum
protection for the engine against corrosion, fouling and marine growth. As
noted above, it is extremely important to keep the system flushed after each
use.
In a closed cooled system raw water is drawn into the boat by the raw
water pump, where it is distributed to the heat exchangers and then to the
exhaust downturn adapters before being returned to the body of water.
The engine recirculation pump recirculates coolant through the engine
and exhaust manifolds. Raw water never enters the engine or exhaust
manifolds.
© 5/2013 Ilmor Marine, LLC, Version 1.0