Air Pressure Tests
WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Coast clutch feed |
| 2 | - | Intermediate clutch feed |
| 3 | - | Reverse clutch feed |
| 4 | - | Forward clutch feed |
| 5 | - | Direct clutch feed |
| 6 | - | Overdrive (O/D) clutch feed |
A no-drive condition can exist, even with correct transmission fluid pressure, because of inoperative clutches or bands. See the Band, Clutch, Solenoid, Application Charts, refer to Pinpoint Tests - OSC Equipped Vehicle or SPECIFICATIONS to determine the appropriate elements. A clutch concern can be located through a series of checks by substituting air pressure for transmission fluid pressure to determine the location of the concern.
Example: When the selector lever is in a forward gear range (Overdrive (Circle D), 2, 1), a no-drive condition may be caused by an inoperative forward clutch.
NOTE:
Use 172 kPa (25 psi) of air pressure when verifying clutch operation. Use of excessive air pressure may damage or roll bonded lip seals resulting in a loss of clutch function.
- Drain the transmission fluid. Remove the transmission fluid pan.
- Remove the transmission filter and seal assembly, the solenoid body and solenoid-to-case gasket.
- Install the Air Test Plate along with the Transmission Test Plate Screw Set.
- Tighten to 10 Nm (89 lb-in).
- 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 Test Port Locations illustration). 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 transmission fluid passages in the case.
- the piston seals are not seated, not installed or are damaged.
- plugged feed holes for clutch apply in the case and/or clutch cylinder.
- damaged piston and/or clutch cylinder.
- Repair as required and recheck.
- Reinstall all components.