187
COOLING SYSTEM
COMPONENTS
9
Pressure Relief Valve
A pressu re relief valve is used to control water
flow and o perating temperature at higher speeds
(above approximately 1200 RPM) . Th e p ressure
relief valve op ens as wate r pressure incre ases.
Spring tension sets the opening pressure.
Overheating: A restricted or faulty valve typically
results in HIGH SPEED overheating.
Overcooling: Debris may prevent the valve fro m
closing completely.
Thermostats
Thermostats control water flow and operating tem-
perature at lower speeds (below 1200 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 const ant move ment of wate r an d/or air from
the block. Circulated water flows through the EMM
and V apor Sep arator befo re exitin g thro ugh th e
overboard indicator.
Pressure Relief Valve Components DRC8113
Thermostat DSC02335
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