Radiator Cap: Testing and Inspection

1. Remove radiator cap from radiator filler neck following described precautions.





2. Use water to clean the radiator cap in the area of the rubber seal and the vacuum relief valve. Immerse the radiator cap in water and install on the shallow filler neck of the Rotunda Radiator/Heater Core Pressure Tester 014-R1072 or equivalent.

NOTE: The adapter is designed to accept both deep and shallow neck radiator caps.

3. Immerse the filler neck seal in water and install in the filler neck adapter.

NOTE: The filler neck seal is reversible so that it may be used on either a deep or shallow radiator filler neck. It will also fit either end of the radiator cap pressure test adapter.

4. Install the filler neck adapter with filler neck seal on the deep filler neck end to the radiator cap pressure test adapter.
5. Connect the female quick connect fitting of the pressure test pump to the male quick connect
6. Slowly depress the plunger of the pressure test pump until the pressure gauge reading stops increasing. 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 pressure relief lever clockwise. Then turn the pressure relief lever clockwise and repeat Step 6 (at least twice) to make sure the pressure test reading is repeatable within the acceptable gauge reading limits of the radiator cap. Also make sure the reading is not erratic.
8. If the pressure test gauge readings are not within the acceptable gauge reading limits, replace the radiator cap. If the pressure test gauge readings are within the acceptable gauge reading limits, perform Pressure Test.