MerCruiser 350 Magnum EFI GEN+ Alfa One, Operation And Maintenance Manual

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101
CA234
Draining Instructions
DRAINING SEAWATER (RAW-WATER) COOLED MODELS
! CAUTION
If boat is to remain in water after draining, seawater inlet hose
must be removed and plugged to prevent a siphoning action
that may occur, allowing seawater to flow from the drain holes
or removed hoses.
! CAUTION
Seawater section of cooling system MUST BE COMPLETELY
drained for winter storage, or immediately after cold weather
use, if the possibility of freezing temperatures exist. Failure to
comply may result in trapped water causing freeze and/or corro-
sion damage to engine.
1
Ensure engine is as level as possible to ensure complete draining
of cooling system.
2
Remove drain plugs from cylinder block as follows:
A Port Side - from cylinder block.
B Starboard Side - from Y-fitting. Do not disturb the Y-fitting when
removing the drain plug. There is an ignition control “Knock Sen-
sor” in the upper hole of the fitting. This sensor must not be loos-
ened or removed. It is tightened to a critical specification at the
factory.
3
Remove drain plugs from bottom of exhaust manifolds (port and
stbd).
4
Repeatedly clean out drain holes using a stiff piece of wire. Do this
until entire system is drained.