48 SENR9977 Testing and Adjusting Section Checking the Filler Cap Remove any deposits that are found on these items, and remove any material that is found on these items. One cause for a pressure loss in the cooling system can be a faulty seal on the radiator pressure cap. 3. Install the pressure cap onto a suitable pressurizing Pump. 4. Observe the exact pressure that opens the filler cap. 5. Compare the pressure to the pressure rating that is found on the top of the filler cap. 6. If the filler cap is damaged, replace the filler cap. Testing The Radiator And Cooling System For Leaks g00296067 Illustration 54 Use the following procedure to test the radiator and the cooling system for leaks.
Typical schematic of filler cap (1) Sealing surface between the pressure cap and the radiator Personal injury can result from hot coolant, steam and alkali. Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.
Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand. Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand. 1. When the engine has cooled, loosen the filler cap to the first stop. Allow the pressure to release from the cooling system. Then remove the filler cap. To check for the amount of pressure that opens the filler cap, use the following procedure: 1. After the engine cools, carefully loosen the filler cap. Slowly release the pressure from the cooling system. Then, remove the filler cap. 2.
Make sure that the coolant covers the top of the radiator core. 3. Put a suitable pressurizing Pump onto the radiator. 2. Inspect the pressure cap carefully. Look for damage to the seal. Look for damage to the surface that seals. Remove any debris on the cap, the seal, or the sealing surface. 4. Use the pressurizing pump to increase the pressure to an amount of 20 kPa (3 psi) more than the operating pressure of the filler cap. Carefully inspect the filler cap. Look for any damage to the seals and to the sealing surface. Inspect the following components for any foreign substances: 5. Check the radiator for leakage on the outside. 6.
Check all connections and hoses of the cooling system for leaks. Filler cap The radiator and the cooling system do not have leakage if all of the following conditions exist: Seal You do NOT observe any leakage after five minutes. Surface for seal