CO-4 COOLING SYSTEM -Troubleshooting, Check and Replacement of Engine Coolant
TROUBLESHOOTING
Problem
Engine overheats
Possible cause
Fan belt loose or missing
Dirt, leaves or insects on radiator or condenser
Hoses, water pump, thermostat housing, radiator,
heater, core plugs or head gasket leakage
Thermostat faulty
Injection timing retarded
,
Fluid coupling faulty
Radiator hose plugged or rotten
Water pump faulty
Radiator plugged or cap faulty
Cylinder head or block cracked or plugged
Remedy
Adjust or replace belts
Clean radiator or condenser
Repair
as
necessary
Check thermostat
Adjust timing
Replace fluid coupling
Replace hose
Replace water pump
Check radiator
Repair as necessary
Page
CH-3
CO-6
EM-24
or
25
HINT: Removal of the thermostat would have an adverse effect, causing
a
lowering of cooling efficiency. Do
not remove the thermostat, even if the engine tends to overheat.
Radia
Drain
CHEC
ENGlF
K
AND REPLACEMENT OF
IE COOLANT
CHECK ENGINE COOLANT LEVEL AT RESERVOIR
TANK
The coolant level should be between the
"LOW"
and
"FU
LL"
lines.
If low, check for leaks and add coolant up to the "FULL"
line.
CHECK ENGINE COOLANT QUALITY
There should not be any excessive deposits of rust or scales
around the radiator cap or radiator filler hole, and the
coolant should be free from oil.
If excessively dirty, replace the coolant.
REPLACE ENGINE COOLANT
(a)
Remove the radiator cap.
CAUTION:
To avoid the danger of being burned, do not
remove
it
while the engine and radiator are
still
hot,
as
fluid and steam can be blown out under pressure.
(b)
Drain the coolant from the radiator and engine drain
cocks.
(c) Closethedraincocks.
Torque (Engine drain cock):
300
kg-cm (22 ft-lb, 29 N-m)
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