GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2005 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 6.6L (LLY) 🢒 Engine Mount Inspection

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

    3. Object Number: 310119 Size: SH
  3. Remove the engine protection shield.

    4. Notice: Refer to Engine Mounting Notice in the Preface section.


    Object Number: 657625 Size: SH
  4. Inspect for loose or missing bolts at the following locations:
    5. • Engine mount bracket to engine
    • Engine mount frame bracket to frame
    • Engine mount to engine mount bracket
    • Engine mount to engine mount frame bracket
  5. Replace missing or loose bolts. Refer to Engine Mechanical Specifications .

    6. Notice: Refer to Engine Lifting Notice in the Preface section.


    Object Number: 657613 Size: SH
  6. If the vehicle is 4-wheel drive (4WD), you will not be able to access the lifting points on the engine. In order to raise the engine, attach a chain to the front of the engine. Then follow the inspection steps.
  7. If the vehicle is rear-wheel drive (RWD), in order to raise the engine to inspect the left engine mount, use a suitable jack on the ground wire bolt bosses on the left side of the engine

    8. Object Number: 657615 Size: SH
  8. If equipped with an automatic transmission, remove the bolt retaining the transmission oil cooler line bracket.
  9. Move the transmission oil cooler lines aside.
  10. In order to raise the engine to inspect the right engine mount, use a suitable jack on the ground wire bolt bosses on the right side of the engine
  11. Perform the following in order to inspect the engine mounts:
    12. 11.1. Raise the engine to remove weight from the engine mount.
    11.2. Place a slight tension on the rubber cushion.
    11.3. Observe the engine mount for the following while raising the engine:
       • Heat check cracks covering the hard rubber surface
       • The rubber cushion is separated from the metal plate of the engine mount.
       • There is a split through the rubber cushion.
  12. Replace the engine mount if any of the above conditions exist.

    13. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 310119 Size: SH
  13. Install the engine protection shield and bolts.

    14. Tighten
    Tighten the engine protection shield bolts to 20 N·m (15 lb ft).


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

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

  15. Lower the vehicle.