Radiator Cap: Testing and Inspection

VISUAL INSPECTION
1. Inspect the areas under the vacuum valve and rubber seal for rust or dirt particles.
2. Using warm tap water, raise the vacuum valve and rubber seal and thoroughly flush away loose rust or trapped dirt particles.
3. Inspect and remove any loose or imbedded rust or dirt particles on the sealing surfaces of the rubber seal.

NOTE: If paint is observed on the filler neck sealing surface, remove it using paint thinner.

4. Inspect the radiator filler neck opening for rust or dirt particles on the sealing surface at the bottom. of the filler neck opening. Use a clean cloth and wipe the sealing surface to remove any rust or dirt particles.

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

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

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 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.

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

NOTE: If the plunger of the pump is depressed too fast, an erroneous pressure reading will result.

6. Slowly depress the plunger of the pressure test pump until the pressure gauge reading stops increasing. Note the highest pressure reading obtained.
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. Refer to Specifications.
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 system Pressure Test.