GASOLINE ENGINES SKI MODELS
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c. From water inlet hose (bottom) from seawater pickup pump.
75533
a
a -
Seawater Inlet Hose
5. After cooling system has been drained completely, install drain plugs, reconnect hoses
and tighten all hose clamps securely.
IMPORTANT: MerCruiser recommends that propylene glycol (a nontoxic and envi-
ronmentally safe) antifreeze be used in the 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 recommendations.
6. For additional assurance against freezing and rust, follow these steps.
a. Remove the thermostat housing and thermostat.
b. Fill the engine seawater cooling system with a mixture of antifreeze and tap water.
Follow the manufacturer’s recommendation to protect engine to the lowest tempera-
ture that it will be exposed to during cold weather or extended storage.
c. Reinstall thermostat and cover.
d. Torque screws with lockwashers to 30 lb. ft. (41 N·m).
74493
a
b
c
d
e
a -
Thermostat Housing
b -
Gasket
c -
Thermostat
d -
Spacer
e -
Thermostat Housing-to-Intake Manifold Gasket