Pressure Cap Testing
Special Tools
GE-42401-A Radiator Cap and Surge Tank Test Adapter
For equivalent regional tools, refer to Special Tools .
- Remove the pressure cap.
- Wash the pressure cap sealing surface with water.
Use a commercial cooling system pressure adapter (1) and moisten the rubber with coolant fluid.
Install the commercial adapter (1) to the GE-42401-1A adapter (2). Use a suitable underlay to be able to use enough force. Inspect the assembly for proper seat then.
- NOTE:
Lubricate GE-42401-1A adapter and pressure cap O-rings with coolant. The GE-42401-1A adapter and the pressure cap should have room temperature to operate properly.
Use commercial coolant pressure tester (4) along with the commercial adapter (3) and install to the GE-42401-1A adapter (2).
- Install the assembly to the pressure cap (1) and apply pressure.
- Test the pressure cap for the following conditions:
- Pressure release when the pressure tester exceeds the pressure rating of the pressure cap.
- Maintain the rated pressure for at least 10 seconds.
- Note the rate of pressure loss.
- Replace the pressure cap under the following conditions:
- The pressure cap does not release pressure which exceeds the rated pressure of the cap.
- The pressure cap does not hold the rated pressure.
To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.