POWERHEAD
COOLING SYSTEM
COOLING SYSTEM
Operation
The cooling system consists
of:
• Water pump,
in
the lower unit
• Water tube, between lower unit and powerhead
• Thermostat,
in
the powerhead
If overheating occurs, check cooling system parts
for blockage, corrosion buildup, or damage.
Refer to
WATER PUMP
on
p.
202.
Refer to driveshaft housing Cleaning and Inspec-
tion on p. 183.
Thermostat Service
Removal
Disconnect water hose from thermostat cover.
Remove two screws, thermostat cover, and ther-
mostat.
1. Water hose
004623
2. Thermostat cover screws
3. Thermostat cover
4.
Thermostat
170
Inspection
If salt deposits, corrosion, wear, or other damage
are found, clean or replace.
Check thermostat opening temperature as
fol-
lows:
• Insert
a length
of
thread between thermostat
valve/body, and suspend thermostat
in
a con-
tainer
of
water.
• Place thermometer
in
container and heat water.
• Observe water temperature when thermostat
valve opens and releases thread.
1. Thermometer 004624
2. Heater
Thermostat operating temperature:
• Standard: 136 to 144
0
F (58 to
62
0
C).
Installation
Install thermostat and thermostat cover
on
cylin-
der and secure with screws.
Tighten screws
84
in
.
Ibs.
(10 N·m).
004625
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