Cooling System Draining Instructions - Mercury HP700 SCi Manual

COLD WEATHER OR EXTENDED STORAGE

Cooling System Draining Instructions

Water trapped in the seawater section of the cooling system can
cause corrosion or freeze damage. Drain the seawater section
of the cooling system immediately after operation or before any
length of storage in freezing temperatures. If the boat is in the
water, keep the seacock closed until restarting the engine to
prevent water from flowing back into the cooling system. If the
boat is not fitted with a seacock, leave the water inlet hose
disconnected and plugged.
NOTE: As a precautionary measure, attach a tag to the key switch
or steering wheel of the boat reminding the operator to open the
seacock or unplug and reconnect the water inlet hose before
starting the engine.
IMPORTANT: In the following draining procedure, the seawater
inlet hose will be removed from the engine. If the boat is in the
water during the following procedure, close the seawater inlet
valve to avoid water entering the boat. If the boat is to remain in
the water, do not open the seawater inlet valve again until the
power package is ready for recommissioning.
NOTE: The boat must be as level as possible to ensure complete
draining of cooling system.
1. If the boat is in the water, close the seawater inlet valve.
2. Remove the following drain plugs and hose:
• End of exhaust manifold distribution rails (plastic wing‑nut
plugs, port and starboard)
• Fuel cooler (plastic wing‑nut plug, Starboard side of the
engine)
• Seapump (remove the inlet hose from the seapump and
allow to drain)
• Transmission cooler (remove the hose from bottom of the
cooler and allow to drain)
• Power steering cooler (plastic wing‑nut plug, Port side of
the engine)
NOTICE
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