E 250 3/4 Ton Van V8-5.4L CNG VIN M (1997)
Radiator Cap: Testing and Inspection
WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING.
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN 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 PRESSURE RELIEF CAP FROM A HOT DEGAS BOTTLE. WAIT UNTIL THE ENGINE
HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY ONE
TURN(COUNTERCLOCKWISE). STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN
CERTAIN ALL THE PRESSURE HAS BEEN RELEASED,REMOVE PRESSURE RELIEF CAP (STILL WITH A CLOTH).
1. Remove pressure relief cap from the degas bottle.
2. Immerse the pressure relief cap in water and install on the shallow filler neck of the Radiator/Heater Core Pressure Tester and Radiator Cap
Adapter (part of the Radiator/Heater Core Pressure Tester).
3. Immerse the filler neck seal in water and install in the filler neck adapter.
4. Install the filler neck adapter with the filler neck seal to the radiator cap pressure test adapter.
5. Connect the female quick-connect fitting of the pressure test pump to the male quick-connect fitting of the filler neck adapter.
6. Slowly depress the plunger of the pressure test pump until the pressure gauge reading stops increasing and note the highest pressure reading
obtained.
NOTE: If the plunger of the pump is depressed too fast, an erroneous pressure reading will result.
7. Release the pressure by turning the relief screw counterclockwise. Then tighten the pressure relief screw and repeat Step 6 (at least twice) to
ensure the reading is repeatable within the specifications of the pressure relief cap.
8. If the pressure test gauge readings are not within specifications, replace the pressure relief cap. If the pressure test gauge readings are within
specifications, perform the Cooling System Pressure Test.
