6B-4 - CLOSED COOLING MODELS 90-823225--1 1096
Description
There are several configurations of this cooling sys-
tem, but the operation is essentially identical. Basi-
cally, the system is composed of two separate sub-
systems: 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 cool-
ing system is similar in function to the rest of the cool-
ing system in an automobile.
The coolant recovery system keeps the reservoir full.
Normal coolant overflow into recovery bottle is ap-
proximately 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 leav-
ing the reservoir, or the gasket under the recovery fill-
er 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.
Seawater Pickup Pump
(If Equipped)
Maintenance
Whenever insufficient water flow is suspected, sea-
water pickup pump should be disassembled and in-
spected by an authorized MerCruiser Dealer.
Stern Drive Unit Seawater Pickup
Pump
NOTICE
Refer to SECTION 6A for information and ser-
vice procedures on Stern Drive Unit Seawater
Pickup Pump.
Belt Driven Seawater Pickup
Pump
72532
b
c
d
a
e
a - Seawater PUmp
b - Bracket
c - Pulley
d - Inlet Hose
e - Outlet Hose
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