GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 Engine Mount Replacement

Removal Procedure

    Object Number: 66191 Size: SH
  1. Disconnect the battery negative cable from the battery. Refer to Battery Cable in engine electrical.

    2. 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.

  2. Support the engine with a suitable jack. Do not load the engine mounts.
  3. Remove the engine mount through bolt and the nut.
  4. Raise the engine only enough to permit removal of the engine mount.

    5. Object Number: 66189 Size: SH
  5. If servicing a 2 wheel drive model truck, remove the engine mount assembly bolts, nuts, and washers.
  6. Remove the engine mount assembly.

    7. Object Number: 66190 Size: SH
  7. If servicing a 4 wheel drive model truck, remove the engine mount assembly bolts, nuts, and washers.
  8. Remove the engine mount assembly.

Installation Procedure

    Object Number: 66189 Size: SH
  1. If servicing a 2 wheel drive model truck, install the engine mount assembly.

    2. Object Number: 66190 Size: SH
  2. If servicing a 4 wheel drive model truck, install the engine mount assembly.

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the engine mount assembly bolts, nuts, and washers.

    4. Tighten

        • Tighten the bolts to 59 N·m (44 lb ft).
        • Tighten the nuts to 45 N·m (33 lb ft).

    Object Number: 66191 Size: SH
  4. Lower the engine until the engine mount through bolt can be inserted.
  5. Install the engine mount through bolt and the nut.

    6. Tighten
    Tighten the through bolt nut to 68 N·m (50 lb ft).

  6. Connect the battery negative cable. Refer to Battery Cable in engine electrical.