Draining - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

Draining

IMPORTANT: Drain only the seawater section of the cooling system. Closed cooling
section must be kept filled year-round with specified coolant.
1. Ensure that the engine is as level as possible to promote complete draining of the
cooling system.
If boat is to remain in the water, seacock, if equipped, must be closed until engine
is to be restarted to prevent water from flowing back into seawater cooling system.
If boat is not fitted with a seacock, water inlet hose must be disconnected and
plugged to prevent water from flowing into cooling system and/or boat. As a
precautionary measure, attach a tag to the ignition switch or steering wheel with the
warning that the valve must be opened or the water inlet hose reconnected prior to
starting the engine.
2. Close seacock, or disconnect and plug seawater inlet hose, if boat is to remain in the
water.
IMPORTANT: Drain only the seawater section of the cooling system. Closed cooling
section must be kept filled year-round with specified coolant.
3. Do NOT open either of these two drain valves in the closed cooled section.
Typical
90-860074--1 FEBRUARY 2002
a
71364
a - Exhaust Manifold Drain Valve
b - Engine Block Drain Valve
CAUTION
MAINTENANCE
75297
b
76391
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