Cooling System - ILMOR 2011 MV8 User Manual

In the event that the fuel system supplying the MV8 engine requires attention, any ad-
justment or replacement must be done by an authorized ILMOR dealer as the lines are
pressurized and can be disconnected only with specialized tools. Replacement of any
part of the fuel system must be with ILMOR-authorized parts only. Failure to follow
this directive can result in damage to the boat, which is not covered by the warranty,
and/or serious injury or death.
Unlike automotive cooling systems
heat exchangers) for cooling, marine engines use fluid-to-fluid heat exchangers. Cooling
is provided by the body of water in which the boat is operated. A raw water pump (rubber
impeller pump) draws water into the boat where it is distributed to the engine, exhaust
system, and heat exchangers for maintaining the engine at an acceptable heat-operating
temperature range.
There are two main types of cooling systems used in ILMOR engines, one of which
will be found with each engine depending upon the type selected:
1. Open Cooling System
(Raw water from a body of water flows through the engine and exhaust manifolds.)
2. Full-Closed System
(Engine coolant flows through the engine and exhaust manifolds.)
Any time the engine is running, an adequate amount of water as defined by ILMOR
Marine MUST be flowing through the cooling system. This requires the boat to be in
an operational-sized body of water or hooked up to the suction side of a raw water
pump via an ILMOR-approved, water supply in a dealership. If the engine operates
without water in the cooling system, in very short order the exhaust system will
overheat and could potentially create an on-board fire. The raw water pump impel-
ler, which operates only with water flow, will also fail. Damage caused to the boat
under these circumstances is not covered under warranty and could result in serious
injury and/or death.
Ensure that the raw water pick-up remains clear of debris at all times. Even
small amounts can clog or block the pick-up, which is located beneath the boat.
The raw water pick-up MUST have an uninterrupted input of water whenever
the engine is running.
Important note: marine growth occurs in brackish and salt water, and
even in what is referred to as "fresh" or salt-free water. Therefore, it is im-
portant to flush the boat's cooling system with fresh water after each use.
Accelerated marine growth occurs when operated in salt water. This makes
it critical to flush the cooling system with fresh water after each use. This fresh
water flushing can be done with the boat either in or out of the water. Instruc-
tions for accomplishing this are provided in the After Each Use chapter of this
Owner's Manual.
Although ILMOR MV8 engines are capable of operation in salt water, if the boat
will be most frequently used in salt water a closed cooling system is recommended.
that use radiators (air-to-fluid
2011 ILMOR MV8 Owner's Manual • Page 6
COOLING
SYSTEM