Coolant Expansion Tank Pressure Cap Pressure Test
Coolant Expansion Tank Pressure Cap Pressure TestWARNING: Never remove the coolant expansion tank cap under any circumstances while the engine is operating. Failure to follow these instructions may result in damage to the cooling system or engine and/or personal injury. To avoid having scalding hot coolant or steam blow out of the cooling system, use extreme care when removing the coolant expansion tank cap from a hot cooling system. Wait until the engine has cooled, then wrap a thick cloth around the coolant expansion tank cap and turn it slowly until the pressure begins to release, step back while the pressure is released from the system. When certain that all pressure has been released, (still with a cloth) turn and remove the coolant expansion tank cap. Failure to follow these instructions may result in personal injury.
1. Remove the coolant pressure cap from the coolant pension tank.
2. Install the coolant pressure cap to the coolant system Pressure Tester.
3. Operate the cooling system pressure tester. Pressurize the coolant pressure cap until the pressure relief valve in the coolant pressure cap opens and observe the gauge reading. Compare the gauge reading with the maximum opening pressure of the coolant pressure cap: 100 KPa (14.5 psi).
4. Release the pressure. Repeat Step 3 at least twice to make sure that the pressure test reading is repeatable and within acceptable gauge reading limits of the expansion tank cap.
5. If the pressure test gauge readings are not within acceptable gauge reading limits, install a new coolant pressure cap.
6. Pressurize the coolant pressure cap until the pressure is just below the opening pressure of the coolant pressure cap.
7. Observe the reading of the pressure gauge for one minute. The pressure should not fall within this time.
8. If the pressure falls below 100 KPa (14.5 psi) of the recorded pressure, install a new coolant pressure cap.