41 4 DLT ENGINE Pressure valve opening pressure 0.9+ 0.15 kg/cm2 (gauge) Vacuum valve opening pressure < 0.05 kg/cm2 Max Checking cap (Refer Figure 66) Check radiator cap for perfect sealing in filler neck. Check radiator cap, main and vacuum valve opening pressures. Replace defective cap with new one of recommended rating. Test for main valve opening pressure. The radiator cap shall be tightened after filling in with water. The water inside the radiator is pressurised. Check that main valve opens at specified pressure of 1.0 kg/cm2 Radiator cap main valve should not open below the specified pressure value. On the vehicle, the functioning of radiator cap main valve can be checked by observing increase in coolant level in auxiliary tank at high coolant temperature. Test for vacuum valve opening - The radiator cap shall be tightened without water inside the radiator and shall be connected to vacuum pump. Check that vacuum valve opens fully at 0.05 kg/cm2 vacuum. On the vehicle, the functioning of the radiator cap vacuum valve can be checked by observing decrease in coolant level in an auxiliary tank when it cools down compared to higher level at high temperature. Fig. 66 (VACUUM VALVE)
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