189
COOLING SYSTEM
ENGINE TEMPERATURE CHECK
9
Software Method
Use Evinrude Diagnostics software to read tem-
perature displays.
Typical temperature displays at IDLE speed
should be 160°F ± 10°F (71°C ± 6°C)
Typical temperature displays at WOT speed
should be 150°F ± 10°F (66°C ± 8°C)
Operating temperature must not exceed 194°F
(90°C).
Pyrometer Method
Use a Temperature Gun, P/N 772018, or a digital
pyrometer to measure the outboard’s operating
temperatures.
Measure temperature at the top of cylinder block,
next to the thermostat housing and cylinder head.
Check temperature on both sides of powerhead.
Typical pyrometer readings at IDLE speed should
be 143°F ± 15°F (62°C ± 8°C)
IMPORTANT: If you get low or inaccurate read-
ings with a digital pyrometer, coat the probe loca-
tion with Thermal Joint Compound, P/N 322170.
Idle Operating Temperature
Troubleshooting (Below Range)
If engine IDLE temperature is below operating
range 160°F ± 10°F (71°C ± 6°C), check thermo-
stat and pressure relief valve operation.
Pressure Relief Valve
The pressure relief valve should be closed at
IDLE speed. Water should not flow past the
plunger and seal.
Start the outboard and check IDLE operating tem-
perature.
Engine Monitor Screen 008104
1. Top of cylinder block (starboard side) 004339
Pressure Relief Valve DRC8113
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