GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1997 🢒 Firebird 🢒 Engine 🢒 Engine Mechanical - 5.7L (LT1) 🢒 Engine Mount Replacement

Removal Procedure

    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.


    Object Number: 40675 Size: MH
  1. Inspect the engine mounts for the following conditions:
    2. • Heat check cracks covering the rubber cushion
    • The rubber cushion separated from the mount plate
    • A split through the center of the rubber cushion
  2. Raise and suitably support the vehicle. Refer to SECTION 0A.
  3. Remove the engine mount through bolts and the nuts.

    4. Object Number: 40680 Size: SH
  4. Raise the engine with a jacking fixture.
  5. Remove the engine mount bolts and mounts.

    6. Object Number: 40678 Size: MH
  6. Remove the engine bracket bolts, stud and brackets.

Installation Procedure

    Object Number: 40678 Size: MH
  1. Install the engine brackets, bolts and stud.

    2. Tighten
    Tighten the engine mount bracket bolts and stud to 58 N·m (43 lb ft).


    Object Number: 40680 Size: SH
  2. Install the engine mounts and bolts.

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

    Lower the engine.


    Object Number: 40675 Size: MH
  3. Install the engine mount through bolts and nuts.

    4. Tighten
    Tighten the engine mount through bolts to 95 N·m (70 lb ft)