Pressure Relief Valve; Thermostats; Block Venting; Cooling System - Evinrude E-TEC 200 Service Manual

COOLING SYSTEM

COMPONENTS

Pressure Relief Valve

A pressure relief valve is used to control water
flow and operating temperature at higher speeds
(above approximately 1200 RPM). The pressure
relief valve opens as water pressure increases.
Spring tension sets the opening pressure.
Overheating: A restricted or faulty valve typically
results in HIGH SPEED overheating.
Overcooling: Debris may prevent the valve from
closing completely.
Pressure Relief Valve Components
186

Thermostats

Thermostats control water flow and operating
temperature 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.
Thermostat
DRC8113

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.
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