Service manual

CLOSED COOLED MODELS SERVICE MANUAL NUMBER 26
Page 6B-2 90-861329--1 MARCH 1999
Torque Specifications
Description lb-in. lb-ft Nm
Drain Plugs Securely
Heat Exchanger End Caps 190 22
Reservoir to Thermostat Housing 30 41
Thermostat Cover 20 27
Hose Clamps
Heat Exchanger Mounting Brackets
Securely
Lubricants/Sealants/Adhesives
Description Part Number
Quicksilver 2-4-C Marine Lubricant With
Teflon
92-825407A3
Quicksilver Perfect Seal 92-34227--1
Specifications
Cooling System Capacity 9 (8.5)
Thermostat 143° F (62° C)
Cap Pressure 14 psi (97 kPa)
Description
There are several configurations of this cooling system, but the operation is essentially iden-
tical. Basically, the system is composed of two separate subsystems: the seawater system
and the closed cooling system. The seawater system is similar in function to the fan used
in an automobile because it absorbs heat (from the closed cooling system) as it passes
through the heat exchanger. The closed cooling system is similar in function to the rest of
the cooling system in an automobile.
The coolant recovery system keeps the reservoir full. Normal coolant overflow into recovery
bottle is approximately 1/2 pint (230 ml) during warm-up. The coolant recovery system
draws coolant back into the reservoir from the recovery bottle as the engine cools. As long
as there is coolant in the recovery bottle, the reservoir should remain completely full. If not,
there’s a vacuum leak, usually at the hose leaving the reservoir, or the gasket under the
recovery filler cap. The gasket seals against the outer rim of the filler neck.
IMPORTANT: The coolant (antifreeze) flows around the outside of the cooling tubes
while seawater flows through the inside of the cooling tubes in the heat exchanger.
Engine exhaust manifold is seawater cooled. Sterndrive seawater pickup pumps seawater
through the heat exchanger.
Index