197
COOLING SYSTEM
COMPONENTS
9
Thermostat
The thermostat is used to control water flow and
operating temperature at slower speeds (below
2000 RPM).
Overheating:
A restricted or faulty thermostat typ-
ically results in LOW SPEED overheating.
Overcooling:
Debris may prevent the thermostat
from closing completely.
Refer to
THERMOSTAT SERVICING
on p. 199.
Block Venting
A fitting and hose connected to the top of the
exhaust cover allows the constant movement of
water and/or air from the block. Circulated water
flows through the
EMM
and vapor separator
before exiting through the overboard indicator.
Water Pressure Connection
Fitting and hose for accessory water pressure
gauge is connected at top of cylinder block adja-
cent to the pressure valve housing.
1.
Cover and O-ring
2.
Spring and thermostat
3.
Seal
4.
Cylinder head
002439
4 3 2 1
1.
Fitting
002440
1.
Fitting
002461
Model
Water Pressure@ 5000 RPM
(Minimum)
75 – 90 HP
16 psi
1
1
Summary of Contents for E-tec 75 HP
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Page 233: ...233 POWERHEAD POWERHEAD VIEWS 10 POWERHEAD VIEWS Port Short Block Starboard Short Block ...
Page 234: ...234 POWERHEAD POWERHEAD VIEWS Port Dressed Powerhead Starboard Dressed Powerhead ...
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Page 236: ...236 POWERHEAD POWERHEAD VIEWS Rear ...
Page 237: ...237 POWERHEAD POWERHEAD VIEWS 10 Top ...
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