F 350 2WD Pickup V8-460 7.5L VIN G EFI (1997)
Radiator Cap: Component Tests and General Diagnostics
1. Remove the pressure relief cap from the radiator filler neck.
2. Use water to clean the pressure relief cap in the area of the rubber seal and the vacuum relief valve. Immerse the pressure relief cap in water to wet
the seals and install on the shallow filler neck of Rotunda Radiator/Heater Core Pressure Tester Adapter 021-00013 or equivalent. (The adapter is
designed to accept both deep and shallow neck radiator caps.)
3. Before installing the pressure relief cap on the adapter, immerse the filler neck seal in water and install it in the filler neck adapter. If the adapter is
made of plastic, check its sealing surfaces to be certain that they are free of rough spots and contain no parting lines or core marks.
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 disconnect fitting of the pressure test pump to the male quick disconnect fitting of the filler neck adapter.
6. SLOWLY depress the pump plunger of the pressure test pump until the pressure gauge reading stops increasing and note the highest pressure
reading obtained. If the plunger of the pump is depressed too fast, an erroneous pressure reading will result.
7. Release the pressure by depressing the pressure relief valve stem. Then, tighten the pressure relief screw and repeat Step 6 (at least twice) to make
sure the pressure test reading is repeatable within the acceptable gauge reading limits of the pressure relief cap and is not erratic.
8. If the pressure test gauge readings are not within the acceptable gauge reading limits, replace the pressure relief cap, and perform the pressure test.
If the pressure test gauge readings are within the acceptable gauge reading limits, perform the pressure test.