Air Pressure Test
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Description |
|---|---|
| 1 | Converter inlet |
| 2 | Converter outlet |
| 3 | Overdrive clutch |
| 4 | Forward clutch |
| 5 | Pump Inlet |
| 6 | Pump outlet |
| 7 | Direct clutch |
| 8 | Torque converter clutch |
| 9 | Intermediate clutch |
| 10 | Low/Reverse dynamic |
| 11 | Low/Reverse static |
NOTE:
The center support contains an air bleed for the Intermediate clutch. Some leakage during the air test can be normal.
NOTE:
The Low/Reverse piston contains an air bleed for the Low/Reverse dynamic circuit. Some leakage during the air test can be normal.
A hydraulic clutch concern can be located through a series of checks by substituting air pressure for fluid pressure to determine the location of the concern.
- Using a rubber tipped blow gun, apply 40 PSI (276 kpa) to the suspect clutch port for 2-3 seconds
- A dull thud indicates the clutch piston applied.
- A hissing noise may indicate a leak in the hydraulic passages. Hydraulic circuits that use scarf cut seals and/or air bleeds will have some normal leakage.
- While holding the blow gun nozzle firmly against the port in the transmission case, release the trigger.
- Wait 1-2 seconds.
- A hissing noise may indicate a leak in the hydraulic passages. Hydraulic circuits that use scarf cut seals and/or air bleeds will have some normal leakage.
- Remove the blow gun from the port.
- A sudden release of air pressure indicates the hydraulic passages are capable of holding pressure.
- No noise may indicate a leak in the hydraulic passages. Hydraulic circuits that use scarf cut seals and/or air bleeds will have some normal leakage.