Service manual

SEAWATER COOLED MODELS
SERVICE MANUAL NUMBER 26
90-861329--1 MARCH 1999 Page 6A-11
5. Insert a small wire (repeatedly) to make sure that vent holes and water drain holes and
passages (as shown) are unobstructed and open.
71216
70134
a
b
c
d
e
f
c
f
a-Speedometer Pitot Tube
b-Gear Housing Cavity Drain Hole
c-Trim Tab Cavity Vent Hole
d-Trim Tab Cavity Drain Passage
e-Gear Housing Water Drain Hole (One Each - Port and Starboard)
f-Gear Housing Cavity Vent Hole
6. Crank engine over SLIGHTLY, with starter motor, to purge any water trapped in
seawater pickup pump. DO NOT ALLOW ENGINE TO START.
7. After seawater section of cooling system has drained completely:
a. Coat threads of drain plugs (except blue plastic plugs with seals) with Perfect Seal
and install.
b. Tighten drain plugs securely.
c. Reconnect hoses and tighten all hose clamps securely.
d. If NOT equipped with seacock: Seawater inlet hose must remain disconnected
and plugged until engine is to be restarted.
IMPORTANT: MerCruiser recommends that propylene glycol antifreeze (nontoxic
and biodegradable, which makes it friendly to lakes and rivers) be used in seawater
section of the cooling system for cold weather or extended storage. Make sure that
the propylene glycol antifreeze contains a rust inhibitor and is recommended for use
in marine engines. Be certain to follow the propylene glycol manufacturer’s recom-
mendations.
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