GM Service Manual Online
For 1990-2009 cars only

Engine Mount Replacement Front

Removal Procedure

Notice: Broken or deteriorated mounts can cause misalignment and destruction of certain drive train components. When a single mount breaks, the remaining mounts are subjected to abnormally high stresses.


    Object Number: 4564  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the underbody shields, if equipped.
  3. Remove the engine mount through-bolt and nut for the side being replaced.

  4. Object Number: 374320  Size: SH

    Notice: When raising or supporting the engine for any reason, do not use a jack under the oil pan, any sheet metal, or the crankshaft pulley. Lifting the engine in an unapproved manner may cause component damage.

  5. Using a jack on the square tab (left side shown) at the rear of the engine block, raise the engine. In order to access the square tab on the right side remove the starter. Refer to Starter Motor Replacement in Engine Electrical.

  6. Object Number: 339094  Size: SH
  7. Remove the bolts for the engine mount frame bracket.
  8. Remove the engine mount frame bracket.

  9. Object Number: 199011  Size: SH
  10. Remove the bolts holding the engine mount to the engine.
  11. Remove the engine mount with the shield.

Installation Procedure


    Object Number: 199013  Size: SH
  1. Sub-assemble the engine mount, shield, and one bolt.

  2. Object Number: 199011  Size: SH
  3. Install the engine mount and shield to the engine.
  4. 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.

  5. Install the engine mount to engine bolts.
  6. Tighten
    Tighten the engine mount to engine bolts to 54 N·m (40 lb ft).


    Object Number: 339094  Size: SH
  7. Install the engine mount frame bracket to the frame.
  8. Install the engine mount frame bracket bolts.
  9. Tighten
    Tighten the engine mount frame bracket bolts to 45 N·m (33 lb ft).

  10. Lower the engine.

  11. Object Number: 4564  Size: SH
  12. Install the engine mount through-bolts and nuts.
  13. Tighten
    Tighten the through-bolts or the nuts to the following:

    • Tighten the through-bolts to 74 N·m (55 lb ft).
    • Tighten the nuts to 63 N·m (46 lb ft).
  14. Install the starter, if removed. Refer to Starter Motor Replacement in Engine Electrical.
  15. Lower the vehicle.

Engine Mount Replacement Rear

Removal Procedure


    Object Number: 339139  Size: SH

    Notice: Broken or deteriorated mounts can cause misalignment and destruction of certain drive train components. When a single mount breaks, the remaining mounts are subjected to abnormally high stresses.

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the nut holding the rear engine mount to the transmission support.

  3. Object Number: 339147  Size: SH
  4. Remove the mount to transmission bolts.
  5. Raise the transmission using a suitable transmission jack, just enough in order to permit the removal of the mount.

  6. Object Number: 339174  Size: SH
  7. Remove the mount.

Installation Procedure


    Object Number: 339174  Size: SH
  1. Install the mount.

  2. Object Number: 339147  Size: SH
  3. Loosely install the mount to transmission bolts.
  4. Lower the transmission.

  5. Object Number: 339139  Size: SH

    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 nut holding the rear engine mount to the transmission support.
  7. Tighten

        • Tighten the nut to 45 N·m (33 lb ft).
        • Tighten the bolt to 50 N·m (37 lb ft).
  8. Lower the vehicle.