6B-38 - CLOSED COOLING MODELS 90-823225--1 1096
Flushing Seawater Section
If boat is operated in salty, polluted or mineral-laden
waters, seawater section of cooling system should
be flushed periodically (preferably after each use) to
remove corrosive water and and prevent the accu-
mulation of deposits in the system. Seawater section
also should be thoroughly flushed prior to storage. To
flush seawater section of cooling system, proceed as
follows:
IMPORTANT: If cooling system is to be flushed
with boat in the water, water inlet valve (if so
equipped) MUST BE closed, or water inlet hose
MUST BE disconnected and plugged, to prevent
water from flowing into boat and/or cooling sys-
tem.
IMPORTANT: If a valve is to be installed for the
purpose of draining or flushing seawater sec-
tion, valve MUST have an internal cross-section-
al area equal to or greater than water inlet hose
to prevent restricting water flow during normal
operation. A 1-1/4 in. (32mm) or larger brass ball
valve or gate valve is recommended.
1. Disconnect water inlet hose from end of seawater
pickup pump.
2. Using appropriate connector, connect city water
tap to pump inlet connection and partially open
water tap (approximately 1/2 minimum capacity).
DO NOT use full city water pressure.
!
WARNING
When flushing cooling system with boat out of
the water, be certain that area in vicinity of pro-
peller is clear and that no person is standing
nearby. As a precautionary measure, it is recom-
mended that propeller be removed.
!
CAUTION
DO NOT run engine above 1500 RPM, as suction
created by seawater pickup pump may collapse
water supply hole, interrupting water flow and
causing engine to overheat.
!
CAUTION
Watch temperature gauge at dash to ensure that
engine does not overheat.
3. Place the remote control lever in neutral position
and start engine. Operate engine at idle speed in
neutral gear for 10 minutes or until discharge wa-
ter is clear, then stop engine.
4. Shut off water tap. Remove flushing connector
from pump inlet and reconnect water inlet hose.
Be sure to tighten hose clamp securely.
IMPORTANT: If boat is in the water, DO NOT open
water inlet valve until engine is to be restarted, to
prevent contaminated water from flowing back
into engine. If boat is not fitted with a valve, leave
water inlet hose disconnected and plugged. As a
precautionary measure, attach a tag to the igni-
tion switch or steering wheel with the warning
that the seacock must be opened or the water in-
let hose reconnected prior to starting the engine.
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