Overdrive Servo

Overdrive Servo

Special Tools:

Removal

1. NOTE: Servicing the intermediate/overdrive servo in the vehicle is only recommended in the event of a leak. If the servo has failed it will be necessary to remove and disassemble the transaxle to inspect the intermediate/overdrive band assembly and direct clutch for damage.

With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Maintenance/Service and Repair.
2. Remove the 7 retainers and the LH splash shield.





3. Remove the transmission fluid cooler tube bracket and bolt and position it aside.





4. WARNING: Follow the specified procedure when using the tool to remove the servo cover. The servo and servo cover are under high spring force and can separate forcefully, which may result in serious personal injury.

CAUTION: Do not use a screwdriver to remove the retaining ring or damage to the case may occur. Use only snap ring pliers to remove the retaining ring.

Using the special tool, remove the servo retaining ring.
1 Install the special tool.
2 Compress the servo assembly by tightening the bolt.
3 Remove the retaining ring.





5. Remove the servo cover assembly.
6. Remove the intermediate and overdrive servo piston and return spring.
7. Wipe the servo piston and the servo cover cap with a lint free cloth.

8. CAUTION: Do not clean the rubber sealing surfaces of the servo piston and the servo cover cap with cleaning solvent or damage to the sealing surface may result.

Inspect the servo piston for cracks on its pressure surfaces and in the sealing area. Look for damage near the point where the servo piston is attached to the servo rod.
9. Squeeze the servo piston lip for flexibility. If the lip feels brittle, install a new piston.
10. Inspect the servo retainer spring for cracks, breaks or deformation.

Installation
1. Install the return spring and the intermediate overdrive servo piston.
2. Install the servo cover cap.
3. Install the special tool.





4. CAUTION: Do not use a screwdriver to install the retaining ring or damage to the case may occur. Use only snap ring pliers to install the retaining ring.

CAUTION: If the case is stamped "WG", install a wide-groove snap ring, or the servo will be damaged.

NOTE: The WG stamp is located on the case toward the passenger side of the overdrive servo. The letters WG are etched into the case and hard to see.

NOTE: If the servo cover will not seat deep enough in the bore to install the servo cover retaining ring, use a blunt punch or small hammer and gently tap the cover around the outer edge until the servo cover retaining ring can be installed.

Tighten the special tool bolt.
^ Install the servo cover retaining ring.





5. Loosen the special tool bolt.
^ When the spring tension is released, remove the special tool.





6. Install the transmission fluid cooler tube and bolt.
^ Tighten to 25 Nm (18 lb-ft).





7. Install the LH splash shield and the 7 retainers.
^ Tighten to 10 Nm (89 lb-in).





8. Start the vehicle. Place the transmission range selector lever in each gear and allow to engage. Check for leaks.
9. Check the transmission fluid.