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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1072 (Engine Mechanical - 6.6L (2 Of 5)) >> On-Vehicle Repair Instructions >> Engine Mount Inspection

Engine Mount Inspection

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the oil pan skid plate.
    3. Fig 2: Identifying Engine Shield And Retaining Bolts
    GM310119Courtesy of GENERAL MOTORS CORP.
  3. Remove the engine protection shield.
    4. Fig 3: View Of Engine Mount To Engine Mount Frame Bracket
    GM657625Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Engine Mounting Notice .
  4. Inspect for loose or missing bolts at the following locations:
    • 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. Fig 4: View Of Ground Wire Bolt Bosses (Left Side)
    GM657613Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Engine Lifting Notice .
  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. Fig 5: View Of Ground Wire Bolt Bosses (Right Side)
    GM657615Courtesy of GENERAL MOTORS CORP.
  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:
    1. Raise the engine to remove weight from the engine mount.
    2. Place a slight tension on the rubber cushion.
    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. Fig 6: Identifying Engine Shield And Retaining Bolts
    GM310119Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  13. Install the engine protection shield and bolts.

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

    14. Fig 7: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  14. Install the oil pan skid plate and bolts.

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

  15. Lower the vehicle.
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