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Low-Reverse Servo Pin Selection

  1. Install center support retaining ring. Determine correct length of low-reverse servo pin to use. Lubricate and install servo piston and return spring. DO NOT  install cover or retaining ring. Install Servo Selector Gauge (T80L-77030-A) into servo bore.
  2. Tighten band apply bolt on tool to 50 INCH lbs. (5.6 N.m). Attach dial indicator. Position indicator stem on flat portion of servo piston. Zero dial indicator. See Fig 1 .
  3. Thread bolt out of selector tool until piston stops against bottom of tool. Read amount of piston travel on dial indicator. If travel is .112-.237" (2.845-6.020 mm), correct servo pin is installed. If travel is not within specification, selective pistons are available. See LOW-REVERSE SERVO PISTONS  .
    Fig 1: Measuring Low-Reverse Servo Pin Travel
    G92C14631Courtesy of FORD MOTOR CO.
    LOW-REVERSE SERVO PISTONS

    Part No. Assembly Length No. of Grooves
    E0AZ7D189-A 2.936" (74.57 mm) 1
    E0AZ7D189-B 2.989" (75.92 mm) 2
    E0AZ7D189-C 3.043" (77.29 mm) 3
  4. Length is measured from base of piston to end of rod. Select servo rod to bring servo travel within specification. Remove selector tool and dial indicator.
  5. Install selected low-reverse servo piston. Install servo cover and cover retaining snap ring.
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