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FULL
LOW
2. If the coolant level is too low, check the reason for the
lost coolant.
a. If coolant loss is due to evaporation, add only clean
soft water.
b. If coolant loss is due to a leak, repair the leak, then
add a coolant mixture of the same type and specifi-
cation that is in the system. If the coolant brand can-
not be identified, drain out all of the remaining cool-
ant and refill with a totally new mix.
NOTE
When adding coolant to thesystem,air must be
vented from the enginecoolant passages byjig-
gling the upper and lower radiator hoses.
Be sure to close the radiator cap securely. If the
cap is loose or improperly closed, coolant may
leak out and the engine could overheat.
Do not use an antifreeze and scale inhibitor at
thesametime.
Never mix different types or brands of coolants.
4.1.4 Radiator Cap
1. Attach the radiator cap to a pressure tester.
2. Apply pressure andobserve the time for the pressure
to fall.
3. If the measurement is les s than th e factory specifica-
tion, replace the cap.
Pressure Falling
Time
Factory
Specification
More than 10 seconds
for pressure fall fro m
88 to to 59kPa
0.9 to 0.6 kgf/cm
2
13to9psi
4.1.5 Radiator
1. Fill the radiator with water.
2. Attach the pressure tester to the radiator.
3. Apply pressure and look for leaks.
4. Repair/replaceas necessaryto assure that the speci-
fied pressure will hold.
Radiator Leakage
Test
Factory
Specification
157 kPa
1.6 kgf/cm
2
23 psi
4.1.6 Thermostat Opening Temperature
1. Suspend the thermostat in water by a string with one
end of the string inserted between the valve and its
seat.
2. Immerse the thermostat in water and raise the tem-
perature of the water gradually.
3. With a thermometer, read the temperature of the
water when the valve opens and leaves the string.
4. Continue heating the water, read the temperature of
the water when the valve has opened approximately
6mm (0.236 in).
5. If the measurement is not within the factory specifica-
tions, replace the thermostat.
Thermostat
Opening
Temperature
Factory
Specification
80.5 to 83. 5.5°C
176.9 to 182. 3
°F
Thermostat
Full Open
Temperature
Factory
Specification
95°C
203
°F