GM Service Manual Online
For 1990-2009 cars only

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.

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. Due to the small clearance between the oil pan and the oil pump screen, jacking against the oil pan may cause the pan to be bent against the pump screen. This will result in a damaged oil pickup unit.

    Important: When performing this service procedure, position a suitable lifting device on the engine locating along each side of the engine block.

  1. Raise the engine in order to remove the weight from the mount and to place a slight tension on the rubber cushion. Observe both mounts while raising the engine.
  2. Inspect for loose or missing bolts at the following locations:
  3. • Engine mount to engine bracket
    • Engine mount to frame
    • Engine mount bracket to engine
  4. Replace missing or loose bolts.
  5. Replace the mount if any of the following conditions exist:
  6. • Cracks or elongated bolt holes on the engine mounts or engine mount brackets
    • Hard rubber surface covered with heat check cracks
    • The rubber cushion separated from the metal plate of the mount
    • The rubber cushion is split through the center
  7. If there is movement between a metal plate of the mount and its attaching points, lower the engine and tighten the bolts or nuts attaching the mount to the engine, the frame or the bracket.