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TRBL
SHTG
Symptom 1: Limited engine speed (below 2,000 r/min)
Symptom 2
• Buzzer comes on
• Overheat warning
indicator comes
on
• Cooling water
does not
discharge from
the cooling water
pilot hole
• Buzzer comes on
• Oil pressure
warning indicator
comes on
9-21
Troubleshooting
Cause 1
Clogged cooling wa-
ter inlet
Water pump mal-
function
Clogged cooling wa-
ter passage
Thermostat malfunc-
tion
Insufficient engine oil
Oil
pressure
de-
crease
Cause 2
—
Water pump impel-
ler malfunction
Water leakage from
water pump hous-
ing
—
—
—
Oil pump malfunc-
tion
Clogged oil strainer
Clogged
oil
pas-
sage
Clogged oil filter
Checking step
Check the cooling
water inlet.
Check the impeller.
Check
the
Woo-
druff key.
Check
the
water
pump housing.
Check
the
insert
cartridge.
Check
the
outer
plate cartridge.
Check the cooling
water
passage
(power unit, exhaust
guide, and upper
case).
Check the thermo-
stat.
Add sufficient oil.
Check the oil pump.
Check the oil strain-
er.
Check the oil pas-
sage (power unit
and oil pump).
Replace the oil fil-
ter.
Refer
to
page
3-9
6-5
6-35
6-5
6-35
6-5
6-35
6-5
6-35
6-5
6-35
3-9
3-7
3-4
5-66
7-11
5-2
3-6
6P23H11
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Table of Contents
Troubleshooting
