Air Pressure Tests
WARNING: This page is about a different car, the 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
AIR PRESSURE TEST PORT LOCATIONS
A no-drive condition can exist, even with correct transmission fluid pressure, because of inoperative clutches or bands. Refer to the Band and Clutch Application Chart locate in GENERAL SPECIFICATIONS to determine the appropriate elements. A clutch concern can be located through a series of checks by substituting air pressure for fluid pressure to determine the location of the concern.
Example: When the transmission range selector lever is in a forward gear range ((D), 2, 1), a no-drive condition may be caused by an inoperative forward clutch.
- Drain the transmission fluid. Remove the transmission fluid pan.
- Remove the filter and seal assembly, the solenoid body, the control assemblies and separator plate, upper/lower gaskets.
- The inoperative clutches can be located by applying air pressure into the appropriate clutch port. See the Air Pressure Test Port Locations illustration for clutch port locations.
- Apply air pressure to the appropriate clutch port (see the AIR PRESSURE TESTS for Port Locations). A dull thud may be heard or movement felt when a clutch piston is applied. If the clutch seals or check ball are leaking, a hissing may be heard.
- If the clutches fail to operate during the air check:
- Inspect the fluid passages in the case.
- The piston seals are not seated, damaged, not installed.
- Plugged feed holes for clutch apply in the case and/or clutch cylinder.
- Damaged piston and/or clutch cylinder.
- Repair as required and re-check.