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POWERHEAD
ENGINE TEMPERATURE CHECK
ENGINE TEMPERATURE
CHECK
Temperature Gun, P/N 772018, or a digital pyrom-
eter should be used to accurately determine the
engine's operating temperatures.
To achieve accurate and consistent readings,
engine temperature must be gauged at the top of
cylinder head.
IMPORTANT: For the following engine operat-
ing temperatures and RPM figures to be correct,
the inlet water temperature must be 70° ± 10°F
(21° ± 3°C).
STEP 1
Install correct test propeller and place outboard in
a test tank.
Start outboard and run at 3000 RPM for at least
five minutes.
Reduce engine speed to 900 RPM. At 900 RPM,
the digital pyrometer or Temperature Gun should
indicate 140° ± 15°F (60° ± 7°C) when checking at
top of the cylinder head.
If engine temperature is not within this range, trou-
bleshoot cooling system to determine problem.
STEP 2
Increase engine speed to 5000 RPM. At 5000
RPM, the digital pyrometer must not indicate more
than 160°F (71°C).
If engine temperature exceeds 160°F (71°C), trou-
bleshoot cooling system to determine problem.
IMPORTANT: If you get low or inaccurate read-
ings during these tests, coat the probe location
with a liberal amount of Thermal Joint Compound,
P/N 322170.
Temperature Gun DR6825
WARNING
To prevent accidental starting of engine
while changing propellers, twist and
remove all spark plug leads.
Model IDLE Temperature
ALL 140° ± 15°F (62° ± 8°C)
Model WOT Temperature
ALL Maximum 160°F (71°C)
17212
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