Ford Fusion Manuals

Ford Fusion: Automatic Transmission - 6-Speed Automatic Transmission – 6F35 / Transmission Air Pressure Test. Diagnosis and Testing

Transmission Air Pressure Test

Ford Fusion. Transmission Air Pressure Test. Diagnosis and Testing
Item Description
1 Foward clutch
2 Direct clutch
3 Intermediate clutch
4 Low reverse clutch
5 Overdrive clutch

NOTE: The center support contains an air bleed for the forward and Low reverse clutch circuits. Some leakage during the air test can be normal.

NOTE: The Intermediate clutch pressure chamber contains an air bleed for the Intermediate clutch 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.

  1. Install the forward clutch and low/reverse clutch main control-to-transmission case seals.
Ford Fusion. Transmission Air Pressure Test. Diagnosis and Testing
  1. 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.
  1. While holding the blow gun nozzle firmly against the port in the transmission case, release the trigger.
  1. 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.
  1. 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.

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