Cap

Fuel and Turbocharger Cooling System







Component Tests

Cap

WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.

1. Remove the pressure relief cap.

2. Inspect the pressure relief cap and seals for damage or deterioration. Install a new pressure relief cap if necessary.

3. Fit the pressure relief cap to the Pressure Test Kit (or equivalent) using an aftermarket adapter.

4. NOTE: If the plunger of the Pressure Test Kit (or equivalent) is depressed too fast, an incorrect pressure reading will result.

Slowly pump the Pressure Test Kit (or equivalent) until the pressure gauge stops increasing and note the highest pressure reading. Release the pressure and repeat the test. Install a new pressure relief cap if the pressure is not 124 kPa (18 psi).