GM Service Manual Online
For 1990-2009 cars only

Engine Mount Replacement Left Side

Removal Procedure

Important: When performing this service procedure, do not lift the engine block by the crankshaft balancer. Damage to the crankshaft balancer, crankshaft pulleys, or the crankshaft could occur.

Do not replace the left or right at the same time. They must be replaced in two separate service procedures, so as not to cause an alignment problem when re-installing the engine mounts.


    Object Number: 66191  Size: SH
  1. Disconnect both the battery negative cables from the batteries. Refer to Battery Cable in Engine Electrical.
  2. Raise the vehicle and support with safety stands.
  3. Move the front wheel to the left against the steering stops.

  4. Object Number: 290320  Size: SH
  5. Install the pole jack on the engine locating tab just to the left rear of the power steering pump.

  6. Object Number: 66189  Size: SH
  7. If servicing a 2 wheel drive vehicle, remove the engine mount assembly bolts, nuts, and washers.
  8. Remove the engine mount assembly.
  9. Remove the engine mount through bolt and the nut.
  10. Raise the engine only enough to permit removal of the engine mount.

  11. Object Number: 66190  Size: SH
  12. If servicing a 4 wheel drive vehicle, remove the engine mount assembly bolts, nuts, and washers.
  13. Remove the engine mount assembly.

Installation Procedure


    Object Number: 66191  Size: SH
  1. If servicing a 2 wheel drive vehicle, install the engine mount assembly.

  2. Object Number: 66189  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.

  3. Install the engine mount assembly bolts, nuts, and washers.
  4. Tighten

        • Tighten the bolts to 59 N·m (44 lb ft).
        • Tighten the nuts to 45 N·m (33 lb ft).

    Object Number: 66190  Size: SH
  5. If servicing a 4 wheel drive vehicle, install the engine mount assembly.
  6. Tighten

        • Tighten the bolts to 59 N·m (44 lb ft).
        • Tighten the nuts to 45N·m  (33 lb ft).

    Object Number: 66191  Size: SH
  7. Lower the engine until the engine mount through bolt can be inserted.
  8. Install the engine mount through bolt and the nut.
  9. Tighten
    Tighten the through bolt nut to 68 N·m (50 lb ft).


    Object Number: 290320  Size: SH
  10. Remove the pole jack from the vehicle.
  11. Connect both the battery negative cables to the batteries. Refer to Battery Cable in Engine Electrical.

Engine Mount Replacement Right Side

Removal Procedure


    Object Number: 84601  Size: SH
  1. Disconnect both the battery negative cable from the batteries. Refer to Battery Cable in Engine Electrical.
  2. Raise the vehicle and support with safety stands.
  3. Remove the starter from the engine block (right side only) and secure out of the way. Refer to Starter Motor Replacement in Engine Electrical.
  4. Install a pole jack on the right rear corner of the engine block just above starter.

  5. Object Number: 66191  Size: SH
  6. Remove the engine mount through bolt and the nut.
  7. Raise the engine only enough to permit removal of the engine mount.

  8. Object Number: 66189  Size: SH
  9. If servicing a 2 wheel drive vehicle, remove the engine mount assembly bolts, nuts, and washers.
  10. Remove the engine mount assembly.

  11. Object Number: 66190  Size: SH
  12. If servicing a 4 wheel drive vehicle, remove the engine mount assembly bolts, nuts, and washers.
  13. Remove the engine mount assembly.

Installation Procedure


    Object Number: 66189  Size: SH
  1. If servicing a 2 wheel drive vehicle, install the engine mount assembly.
  2. 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.

  3. Install the engine mount assembly bolts, nuts, and washers to the crossmember.
  4. Tighten

        • Tighten the bolts to 59 N·m (44 lb ft).
        • Tighten the nuts to 45 N·m (33 lb ft).

    Object Number: 66190  Size: SH
  5. If servicing a 4 wheel drive vehicle, install the engine mount assembly.
  6. Install the engine mount nuts, bolts, and washers to the crossmember.
  7. Tighten

        • Tighten the bolts to 59 N·m (44 lb ft).
        • Tighten the nuts to 45 N·m (33 lb ft).
  8. Remove the pole jack from the engine block.

  9. Object Number: 84601  Size: SH
  10. Install the starter to the engine block (right side only). Refer to Starter Motor Replacement in Engine Electrical.

  11. Object Number: 66191  Size: SH
  12. Lower the engine until the engine mount through bolt can be inserted.
  13. Install the engine mount through bolt and the nut.
  14. Tighten
    Tighten the through bolt nut to 68 N·m (50 lb ft).

  15. Connect both the battery negative cables to the batteries. Refer to Battery Cable in Engine Electrical.