190
COOLING SYSTEM
ENGINE TEMPERATURE CHECK
Software Method
Use Evinrude Diagnostics sof tware to read te m-
perature displays.
Typical temp erature displays at IDL E spe ed
should be 160°F ± 10°F (71°C ± 6°C)
Typical temperature displays at WOT spe ed
should be 150°F ± 10°F (66°C ± 8°C)
Operating temperature must no t e xceed 194°F
(90°C).
Pyrometer Method
Use a Temperature Gun, P/N 772018, or a digital
pyrometer to mea sure the outboard’s operating
temperatures.
Measure temperature at the t op of cylinder b lock,
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 en gine IDLE tempera ture is belo w op erating
range 160°F ± 10°F (7 1°C ± 6°C), ch eck thermo-
stat and pressure relief valve operation.
Pressure Relief Valve
The pressu re re lief valve should b e closed at
IDLE speed. W ater should no t flo w past t he
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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