L2501 ENGINE – COOLING SYSTEM

Fan Belt Tension
1. Measure the deflection (A), depressing the belt halfway between the fan drive pulley and alternator pulley at specified force 98 N (10 kgf, 22 lbf).
2. If the measurement is not within the factory specifications, loosen the alternator mounting screws and relocate the alternator to adjust.

Fan Belt Damage and Wear
1. Check the fan belt for damage.
2. If the fan belt is damaged, replace it.
3. Check if the fan belt is worn and sunk in the pulley groove.
4. If the fan belt is nearly worn out and deeply sunk in the pulley groove, replace it.
(A) Good
(B) Bad

Thermostat Valve Opening Temperature
1. Suspend the thermostat in the water by a string with its end inserted between the valve and seat.
2. Heating the water gradually, read the temperature when the valve opens and leaves the string.
3. Continue heating and read the temperature when the valve opens approx. 6 mm (0.2 in.).
4. If the measurement is not within the factory specifications, replace the thermostat.

Radiator Cap Air Leakage
CAUTION
When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down. Otherwise, hot water may gush out, scalding nearby people.
1. Set a radiator tester (Code No. 07909-31551) and an adapter (BANZAI Code No. RCT-2A-30S) on the radiator cap.
2. Apply the specified pressure 80 kPa (0.9 kgf/cm2, 10 psi), and measure the time for the pressure to fall to 60 kPa (0.6 kgf/cm2, 10 psi).
3. If the measurement is less than the factory specification, replace the radiator cap.

Radiator Water Leakage
1. Pour a specified amount of water into the radiator.
2. Set a radiator tester (Code No. 07909-31551) with an adaptor (BANZAI Code No. RCT-2A-30S) and raise the water pressure to the specified pressure.
3. Check the radiator and water pipes for water leak.
4. For water leak from the pinhole, replace the radiator or repair with the radiator cement. When water leak is excessive, replace the radiator.
5. For water leaf from water pipe, replace the water pipe.

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