Evinrude E-Tec 40 HP, Service Manual

Page: 182 / 426

180
COOLING SYSTEM
ENGINE TEMPERATURE CHECK
ENGINE TEMPERATURE
CHECK
IMPORTANT:
The engine tempe ratures listed
below are based on an intake water temperature
of 70° ± 10°F (21° ± 3°C).
Install correct test propeller and place outboard in
a test tank or in the water. Start outboard and run
at 3000 RPM in FOR WARD gear for at least five
minutes. Remember, running o utboards a t high
speeds in test t anks may disrupt wat er flow to
gearcase water int akes. Make sure the outbo ard
has adequate water flow.
Reduce speed to IDLE for five minutes. Check
IDLE operating temperature.
Increase speed to 5000 RPM and check tempera-
ture.
If engine temperatures are not within range, trou-
bleshoot cooling system.
If engine temperature tests within rang e, but the
engine mon itor d isplay ind icates a “W ATER
TEMP” warning, refer to
WATER TEMP/ HOT Cir-
cuit Test
on p. 108.
Software Method
Use
Evinrude Diagnostics
sof tware to read tem-
perature displays.
Typical temperatur e sensor readin gs at IDLE
speed should be 155°F ± 5°F (68.3°C ± 3°C).
Typical temperatu re sensor readings at WOT
speed should be 160°F ± 40°F (71°C ± 22°C).
Operating temp erature must not excee d 212°F
(100°C).
Pyrometer Method
Use a Temperature Gun, P/N 772018, or a digital
pyrometer to measure the ou tboard’s operating
temperatures.
Measure temperature of the thermostat housing at
the top of cylinder head.
Typical pyrometer readings at IDLE speed should
be 145°F ± 10°F (63°C ± 6°C).
Typical pyrometer readings at WOT speed should
be 150°F ± 40°F (66°C ± 22°C).
A
CAUTION
When servicing the propeller, always shift
the outboard to NEUTRAL, turn the key
switch OFF, and twist and remove all
spark plug leads so the engine cannot be
started accidentally.
Monitor Screen
008598