SEAWATER COOLING SYSTEM
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 6A-5
Precautions
IMPORTANT: If the possibility of freezing exists, seawater section, and associated
heat exchangers, MUST BE drained to prevent freeze damage to cooling system and
engine. Seawater section also should be drained if boat is to be stored for an
extended period of time, to prevent corrosion damage.
CAUTION
Seawater cooling system MUST BE completely drained for storage, or trapped wa-
ter may cause freeze and/or corrosion damage to engine and/or components.
CAUTION
If boat is in the water, seacock (if equipped) MUST remain closed until engine is to
be restarted, to prevent water from flowing back into the cooling system. If boat is
not fitted with a seacock, water inlet hose must remain 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 seacock must be opened or the water inlet hose reconnected prior to start-
ing the engine.
IMPORTANT: A wire should be repeatedly inserted into drain holes to ensure that for-
eign material is not obstructing the drain holes.
IMPORTANT: To prevent threads from rusting out during storage, reinstall plugs us-
ing Perfect Seal on threads. NEVER leave drain plugs out after cleaning or during
storage.
Seawater Pickup Connection
Water pickup must be large enough to permit sufficient water flow to engine seawater pickup
pump for adequate engine cooling.
IMPORTANT: Do NOT install water pickup directly in line with propeller, as pickup
may create turbulence and allow air to flow into the propeller slipstream. This will
cause propeller ventilation and will adversely affect boat performance.
Pickup also must supply a positive head while underway. Water pickup should be located
as close to seawater pickup pump inlet as possible and in an area where an uninterrupted,
solid stream of water will flow past when boat is underway.
Use only inner diameter wire reinforced hose of adequate wall thickness to prevent it from
collapsing from pump suction. Secure hose connections with double hose clamps.
Refer to Specifications.
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