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2-4 Servo: Assembly

  1. Clean the components with a suitable solvent and use compressed air to dry all parts and clean the fluid passages. Perform the following before assembly:
    • Inspect the servo band piston for damage or wear.
    • Inspect the 2-4 band for wear and burning.
    • Check the servo band piston and servo piston large and small seals for burrs or damage.
    2. NOTE: Do not compress the servo piston spring when measuring it with vernier calipers.
    Fig 1: Measuring Free Length Of Servo Piston Spring
    G01372043Courtesy of FORD MOTOR CO.
  2. Measure the free length of the servo piston spring and check for deformation.
    • If not within the specification, replace the servo piston spring.
  3. Install the new servo piston large seal and servo piston small seal on the servo piston.
    1. Apply Motorcraft MERCON® Multi-Purpose Automatic Transmission Fluid XT-2-QDX or equivalent meeting Ford specification MERCON to the servo piston large seal with inner diameter (piston stem side): 58.5 mm (2.303 in).
    2. Apply Motorcraft MERCON® Multi-Purpose Automatic Transmission Fluid XT-2-QDX or equivalent meeting Ford specification MERCON to the servo piston small seal with inner diameter (servo retainer side): 25.5 mm (1.004 in).
    Fig 2: Installing Servo Piston Large Seal And Servo Piston Small Seal On Servo Piston
    G01372044Courtesy of FORD MOTOR CO.
  4. Assemble the servo piston stem and the servo band piston.
    1. Slide the spacer onto the servo piston stem.
    2. Slide the servo band piston onto the servo piston stem.
    3. Install the servo piston clip into the hole at the end of the servo piston stem.
    Fig 3: Assembling Servo Piston Stem And Servo Band Piston
    G01372045Courtesy of FORD MOTOR CO.
  5. Apply Motorcraft MERCON® Multi-Purpose Automatic Transmission Fluid XT-2-QDX or equivalent meeting Ford specification MERCON to the new servo piston cover seal and install it on the servo retainer.
    • Use the servo piston cover seal with inner diameter of 65.7 mm (2.587 in).
    Fig 4: Installing Servo Piston Cover Seal On Servo Retainer
    G01372046Courtesy of FORD MOTOR CO.
  6. Slide servo retainer onto the servo piston stem.
    Fig 5: Sliding Servo Retainer Onto Servo Piston Stem
    G01372047Courtesy of FORD MOTOR CO.
  7. Slide the servo piston spring onto the servo piston stem.
Fig 6: Sliding Servo Piston Spring Onto Servo Piston Stem
G01372048Courtesy of FORD MOTOR CO.
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