MerCruiser 13, Service Manual

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6B - 12 - CLOSED COOLING MODELS 90-816462 2-695
4. Shut off tap water. Remove hose and flushing at-
tachment from drive unit. On belt driven seawater
pickup pump models, also remove hose and
flushing attachment from pump inlet.
5. Follow instructions “a” or “b.”
! CAUTION
If boat is in the water, seacock (if so equipped)
must remain closed until engine is to be re-
started, to prevent contaminated water from flow-
ing back into cooling system. If boat is not fitted
with a seacock, water inlet hose must remain dis-
connected and plugged, to prevent water from
flowing into cooling system and/or boat. As a pre-
cautionary 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 starting the engine.
a. If equipped with seacock: Observing pre-
caution above, open seacock.
b. If NOT equipped with seacock: Observing
precaution above, remove plug from seawa-
ter inlet hose and reconnect seawater inlet
hose. Tighten hose clamps securely.
Draining Seawater Section of
Closed Cooling System
NOTICE
For cold weather or extended storage information
and procedures, refer to SECTION 1B.
NOTE: It may be necessary to lift, bend, or lower
hoses to allow water to drain completely when hoses
are disconnected.
! CAUTION
If boat is in the water or is to remain in the water,
seacock (if so equipped) must remain closed un-
til engine is to be restarted, to prevent contami-
nated water from flowing back into cooling sys-
tem. If boat is not fitted with a seacock, water inlet
hose must be left disconnected and plugged, to
prevent contaminated 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 recon-
nected prior to starting the engine.
1. Close seacock (if so equipped) or disconnect and
plug seawater inlet hose.
2. Check that engine is as level as possible to en-
sure complete draining of cooling system.
3. Remove drain plugs from exhaust manifold.
71424
a
a - Drain Plug (Port and Starboard)
4. Remove aft (rear) drain plug from heat exchang-
er.
71423
a
a - Drain Plug