187
COOLING SYSTEM
COMPONENTS
9
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.
V6 models
1. Adapter/inner exhaust housing
2. Water tube(s)
005396
20 in. models
25 in. models
25 in. models
Pressure Relief Valve Components 005391
Thermostat 005392
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