Radiator Cap: Testing and Inspection

RADIATOR CAP PRESSURE TEST





1. Use an adapter to attach the cap to the tester.
2. Increase the pressure until the indicator of the gauge stops moving.
Main valve opening pressure: 96.1-124.5 kPa (0.98-1.27 kg/m2, 13.94-18.06 psi)
Main valve closing pressure: 83.4 kPa (0.85 kg/cm2, 12.1 psi)
3. Check that the pressure level is maintained at or above the limit.
4. Replace the radiator cap if the reading does not remain at or above the limit.

NOTE: Be sure that the cap is clean before testing, since rust or other foreign material on the cap seal will cause an improper indication.

SPECIFIC GRAVITY TEST





1. Measure the specific gravity of the coolant with a hydrometer.
2. Measure the coolant temperature, and calculate the concentration from the relation between the specific gravity and temperature, using the following table for reference.

RELATION BETWEEN COOLANT CONCENTRATION AND SPECIFIC GRAVITY





Example The safe operating temperature is -15°C (5°F) when the measured specific gravity is 1.058 at coolant temperature of 20°C (68°F).

CAUTION: If the concentration of the coolant is below 30%, the anti-corrosion property will be adversely affected. In addition, if the concentration is above 60%, both the anti-freeze and engine cooling properties will decrease, affecting the engine adversely. For these reasons, be sure to maintain the concentration level within the specified range. Do not use together with another brand.





RECOMMENDED COOLANT