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Engine Cooling
COOLING SYSTEM OVERVIEW
Refer to Figure 1. The engine is cooled by a pres-
surized, closed-loop liquid cooling system. Coolant
is pumped through passages in the engine block,
head and exhaust manifold. The exhaust manifold
also serves as the engine coolant reservoir.
The heat exchanger is mounted inside the exhaust
RAW WATER FLOW
SENSOR
THERMOSTAT
HOUSING
COOLANT
PUMP PULLEY
BLOCK
DRAIN CAP
INSULATED
GASOLINE
HOSE
RAW WATER
PUMP PULLEY
EXHAUST MANIFOLD &
COOLANT RESERVOIR
FIGURE 1. ENGINE COOLING SYSTEM
6
manifold. Raw water (the flotation water) is pumped
through tubes in the heat exchanger to cool the en-
gine coolant and then is passed through a hose into
the exhaust-water mixer to cool the exhaust gases.
The raw water is expelled from the boat along with
the exhaust gases. The V-belt drives the coolant
and the raw water pumps.
PRESSURE CAP &
COOLANT FILL NECK
RAW
WATER IN
Redistribution or publication of this document,
HOSE BARB TO
CONNECT COOLANT
RECOVERY TANK
WHEN REQUIRED,
REMOVE THIS HOSE
AND CONNECT A
SIPHON BREAK
(PAGE 7)
EXHAUST-WATER
MIXER WITH HIGH
TEMPERATURE
EXHAUST SWITCH
EXHAUST &
RAW WATER
OUT
DISCONNECT THE
RAW WATER PICKUP
HOSE HERE FOR THE
RAW WATER PICKUP
TEST (PAGE 8)
COOLANT
RAW WATER
by any means, is strictly prohibited.
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