GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Denali 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Engine Mount Replacement - Right Side

Removal Procedure

Notice: Broken engine mountings can cause misalignment of certain drive-train components. Misalignment of drive-train components causes eventual destruction of the drive-train components.

If one engine mount breaks, the rest of the engine mounts will have increased stress put on them. This could cause the rest of the engine mounts to break.


    Object Number: 310259 Size: SH
  1. From under the hood, remove the engine mount to engine mount bracket bolts. (left side shown, right side similar).

    2. Object Number: 309158 Size: SH
  2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Remove the oil pan skid plate bolts and plate.

    4. 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.


    Object Number: 374320 Size: SH
  4. Using an adjustable 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, remove the starter. (left side shown, right side similar). Refer to Starter Motor Replacement .

    5. Object Number: 310267 Size: SH
  5. Remove the engine mount bolts.
  6. Remove the engine mount.

    7. Object Number: 310262 Size: SH
  7. If necessary, remove the engine mount side bracket bolts and bracket.

    8. Object Number: 781986 Size: SH
  8. Remove the engine mount bracket bolts.
  9. Remove the engine mount bracket.

Installation Procedure

    Object Number: 781986 Size: SH
  1. Install the engine mount bracket.
  2. Perform the following procedure prior to installing the engine mount bracket bolts.
    3. 2.1. Remove all traces of the original adhesive patch.
    2.2. Clean the threads of the bolt with denatured alcohol or equivalent and allow to dry.
    2.3. Apply threadlocker GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the bolts.

    Notice: Refer to Fastener Notice in the Preface section.

  3. Install the engine mount bracket bolts.

    4. Tighten
    Tighten the engine mount bracket bolts to 75 N·m (55 lb ft).


    Object Number: 310262 Size: SH
  4. Position the engine mount side bracket to the engine, if removed.
  5. Install the engine mount side bracket bolts.

    6. Tighten
    Tighten the engine mount side bracket bolts to 50 N·m (37 lb ft).


    Object Number: 310267 Size: SH
  6. Install the engine mount.
  7. Install the engine mount bolts.

    8. Tighten
    Tighten the engine mount bolts to 50 N·m (37 lb ft).

  8. Lower the engine.
  9. Install the starter. Refer to Starter Motor Replacement .

    10. Object Number: 309158 Size: SH
  10. Install the oil pan skid plate and bolts.

    11. Tighten
    Tighten the oil pan skid plate bolts to 20 N·m (15 lb ft).

  11. Lower the vehicle.

    12. Object Number: 310259 Size: SH
  12. Install the engine mount to engine mount bracket bolts.

    13. Tighten
    Tighten the engine mount to engine mount bracket bolts to 65 N·m (48 lb ft).