Check The Engine Coolant Level; Drain The Engine Coolant - ILMOR MV8 Owner's Manual

CHECK THE ENGINE COOLANT LEVEL

This procedure applies to boats equipped with closed cooled cooling
system. Because this process should be completed while the engine is cool
(in order to avoid burns), it is recommended that this check be completed
prior to starting the engine.
1. Ensure the engine is OFF and the engine safety starting switch is
disconnected. Leave the throttle/shift control lever in neutral. Open the
engine compartment. Locate the closed cooling system tank adjacent to
the engine.
2. Remove the cap and check the level. Verify that the fluid is at the
FULL COLD line. (When the engine heats, the water will expand; that
is the reason the tank should not be full when the engine is cold.) If
the level is at or below that, add 5-year extended warranty propylene
glycol coolant premixed 50/50 with water. The cooling system will take
between 5 gal (19 L) and 7 gal (26 L) of coolant in total. If your engine
is equipped with a vertical tank with a clear sight tube near the front of
the engine, verify that the coolant reaches the lowest support rung on
the clear sight tube.
If the tank was completely or nearly empty, see your authorized Ilmor
dealer for immediate assistance as the engine cooling system will likely
require purging. This function should be completed only by a trained Ilmor
service technician.
NOTICE: Always maintain the correct coolant level. Failure to maintain
coolant at the proper level will cause potentially serious engine damage.
The warranty does not cover engine damage due to overheating or any
other cause associated with improper coolant levels.

DRAIN THE ENGINE COOLANT

For closed cooled systems:
1. Remove the coolant cap to allow for an air bleed.
2. Remove the STBD exhaust manifold feed hoses to the thermostat to
allow for an air bleed. Remove the 1-1/4 in. hose between the engine
and heat exchanger. Allow all the coolant to drain.
3. Drain both exhaust manifolds by removing the lower rubber hose on
the exhaust manifolds.
4. Reinstall all hoses once all coolant has drained.
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