Isuzu 4JA1 Workshop Manual page 50

6A – 28 ENGINE MECHANICAL
Cooling System Inspection
Install a radiator filler cap tester to the radiator. Apply
testing pressure to the cooling system to check for
leakage. The testing pressure must not exceed the
specified pressure.
Testing Pressure
030LX003
Radiator Cap Inspection
The radiator filler cap is designed to maintain coolant
pressure in the cooling system at 103 kPa(1.05 kg/cm
15psi).
Check the radiator filler cap with a radiator filler cap tester.
The radiator filler cap must be replaced if it fails to hold the
specified pressure during the test procedure.
Radiator Cap Valve Opening Pressure
030LX002
Negative Valve (Reference)
150 (1.5/21)
90 – 120 (0.9 – 1.2/13 – 17)
1.9 – 4.9 (0.02 – 0.05/0.28 – 0.71)
2
kPa(kg/cm /psi)
2
,
2
kPa(kg/cm /psi)
2
kPa(kg/cm /psi)