SECTION 2 ILMOR MV8 OWNER’S MANUAL
2-4 © 5/2013 Ilmor Marine, LLC, Version 1.0
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
e 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 ush the system with fresh water aer every use.
However, even if boating in salt-free, apparently clean fresh water, ushing
the cooling system following use is recommended. is 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. (e 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
e closed cooled system is the required application for boats operating
in consistently brackish or salt water. e system provides maximum
protection for the engine against corrosion, fouling and marine growth. As
noted above, it is extremely important to keep the system ushed aer 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.
e engine recirculation pump recirculates coolant through the engine
and exhaust manifolds. Raw water never enters the engine or exhaust
manifolds.