219
COOLING SYSTEM
COMPONENTS
10
Pressure Relief Valve
A pressure relief valve is used to control water
flow and operating temperature at higher speeds
(above approximately 2500 RPM / 21 PSI). The
pressure relief valve opens as water pressure
increases. Spring tension sets the opening pres-
sure.
Overheating: A restricted or faulty valve typically
results in HIGH SPEED overheating.
Overcooling: Debris may prevent the valve from
closing completely.
Thermostats
Thermostats control water flow and operating tem-
perature at lower speeds (below 2500 RPM).
Overheating: A restricted or faulty thermostat typ-
ically results in LOW SPEED overheating.
Overcooling: Debris may prevent the thermostat
from closing completely.
Block Venting
A fitting and hose from the top of the block 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
A fitting and hose for an accessory water pressure
gauge can be connected on the starboard side of
the cylinder block next to the starter solenoid.
Pressure Relief Valve Components 005391
Thermostat 005392
1. Water pressure hose fitting 004959
1
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