GM Service Manual Online
For 1990-2009 cars only

Forward Servo Replacement 3.5L Twin Cam V6 LX5

Removal Procedure

  1. Install the engine support fixture. Refer to Engine Support Fixture .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the power steering rack and pinion and hang the power steering rack and pinion from the exhaust pipe. Refer to Steering Gear Replacement Power Steering System.
  4. Remove the transaxle mount lower nuts. Refer to Transmission Mount Replacement .
  5. Remove the engine mount lower nuts. Refer to Engine Mount Replacement in Engine Mechanical - 3.5L.
  6. Remove the power steering cooler pipe from the right side of the frame.
  7. Support the rear of the frame with a jackstand.
  8. Loosen the front frame bolts. Refer to Frame Removal in Frame and Underbody.
  9. Adjust the jackstand to lower the rear of the frame.
  10. Position a drain pan under the forward servo cover.

  11. Object Number: 164777  Size: SH
  12. Remove the bolts and/or screws attaching the servo cover to the transaxle case.
  13. Remove the forward servo cover.
  14. Remove the forward servo cover O-ring.
  15. Remove the servo piston assembly.
  16. Remove the servo spring.

Installation Procedure


    Object Number: 164777  Size: SH
  1. Install the servo spring.
  2. Install the servo piston assembly.
  3. Install the forward servo cover O-ring.
  4. Install the forward servo cover.
  5. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Install the forward servo cover attaching bolts.
  7. Tighten
    Tighten the forward servo cover attaching bolts to 11 N·m (97 lb in).

  8. Remove the drain pan from under the forward servo cover.
  9. Adjust the jackstand to raise the rear of the frame.
  10. Install the frame bolts. Refer to Frame Removal in Frame and Underbody.
  11. Remove the support from the rear of the frame.
  12. Install the power steering cooler pipe to the right side of the frame.
  13. Install the engine mount lower nuts. Refer to Engine Mount Replacement in Engine Mechanical - 3.5 L.
  14. Install the transaxle mount lower nuts. Refer to Transmission Mount Replacement .
  15. Install the power steering rack and pinion. Refer to Steering Gear Replacement Power SteeringSystem.
  16. Lower the vehicle.
  17. Remove the engine support fixture. Refer to Engine Support Fixture .

Forward Servo Replacement 3800 L36

Removal Procedure

  1. Install the engine support fixture. Refer to Engine Support Fixture .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the power steering rack and pinion and hang the power steering rack and pinion from the exhaust pipe. Refer to Steering Gear Replacement in Power Steering System.
  4. Remove the transaxle mount lower nuts. Refer to Transmission Mount Replacement .
  5. Remove the engine mount lower nuts. Refer to Engine Mount Replacement in Engine Mechanical - 3.8L.
  6. Remove the power steeringcooler pipe from the right side of the frame.
  7. Support the rear of the frame with a jackstand.
  8. Loosen the front frame bolts. Refer to Frame Removal in Frame and Underbody.
  9. Adjust the jackstand to lower the rear of the frame.
  10. Position a drain pan under the forward servo cover.

  11. Object Number: 164777  Size: SH
  12. Remove the bolts and/or screws attaching the servo cover to the transaxle case.
  13. Remove the forward servo cover.
  14. Remove the forward servo cover O-ring.
  15. Remove the servo piston assembly.
  16. Remove the servo spring.

Installation Procedure


    Object Number: 164777  Size: SH
  1. Install the servo spring.
  2. Install the servo piston assembly.
  3. Install the forward servo cover O-ring.
  4. Install the forward servo cover.
  5. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Install the forward servo cover attaching bolts.
  7. Tighten
    Tighten the forward servo cover attaching bolts to 11 N·m (97 lb in).

  8. Remove the drain pan from under the forward servo cover.
  9. Adjust the jackstand to raise the rear of the frame.
  10. Install the frame bolts. Refer to Frame Removal in Frame and Underbody.
  11. Remove the support from the rear of the frame.
  12. Install the power steering cooler pipe to the right side of the frame.
  13. Install the engine mount lower nuts. Refer to Engine Mount Replacement in Engine Mechanical.
  14. Install the transaxle mount lower nuts. Refer to Transmission Mount Replacement .
  15. Install the power steering rack and pinion. Refer to Steering Gear Replacement in Power Steering System.
  16. Lower the vehicle.
  17. Remove the engine support fixture. Refer to Engine Support Fixture .