Yamaha E115A Service Manual page 248

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TRBL
SHTG
Symptom 1: Limited engine speed (below 2,000 r/min)
Symptom 2
9Buzzer comes
on
9Overheat warn-
ing indicator
comes on
9Cooling water
does not dis-
charge from the
cooling water
pilot hole
9-5
Troubleshooting
Cause 1
Clogged cooling water
inlet
Water pump
malfunction
Clogged cooling water
passage
Thermostat
malfunction
Cause 2
Check the cooling
water inlet.
Check the impeller.
Water pump
impeller
Check the Woodruff
malfunction
key.
Check the water pump
housing.
Water leakage
Check the insert car-
from water
tridge.
pump housing
Check the outer plate
cartridge.
Check the cooling
water passage
(exhaust guide, upper
case and water tube).
Check the thermostat.
Checking step
Refer
to
page
3-4
6-5
6-5
6-5
6-5
6-5
7-13
3-3
61U5H11

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