GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Classic - 2WD 🢒 Engine 🢒 Engine Mechanical - 8.1L 🢒 Crankshaft Balancer Replacement

Tools Required

    • J 38416-B Harmonic Balancer Remover
    • J 42845 Crankshaft Balancer Installer
    • J 42846 Crankshaft Balancer Protector Button
    • J 42847 Flywheel Holding Tool

Removal Procedure

    Object Number: 470799 Size: SH
  1. Remove the air conditioning (A/C) belt. Refer to Air Conditioning Compressor Belt Replacement .
  2. Remove the fan. Refer to Fan Replacement .
  3. Remove the starter motor. Refer to Starter Motor Replacement .

    4. 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.

    Important: Ensure that the teeth of the flywheel holding tool engage the engine flywheel teeth.

  4. Install the J 42847 to the starter bolt holes.

    5. Tighten
    Tighten the J 42847 bolts to 50 N·m (37 lb ft).

  5. Remove the crankshaft balancer bolt and washer.

    6. Object Number: 640013 Size: SH
  6. Install the J 42846 onto the end of the crankshaft.

    7. Object Number: 640014 Size: SH
  7. Install the J 38416-B (2) onto the J 42846 (1) in order to remove the crankshaft balancer. Place the legs of the J 38416-B into the recesses cast into the backside of the balancer inner hub.
  8. Tighten the center screw of the J 38416-B until the crankshaft balancer is clear of the crankshaft nose.

    9. Object Number: 640015 Size: SH
  9. Remove the crankshaft balancer.
  10. Remove the J 42846 from the end of the crankshaft.

Installation Procedure

Important: 

   • The balancer should be positioned onto the end of the crankshaft as straight as possible prior to tool installation.
   • Apply grease or clean engine oil to the inside of the crankshaft balancer or the end of the crankshaft, to prevent galling during assembly.


    Object Number: 639539 Size: SH
  1. Install the balancer onto the end of the crankshaft.
  2. Install J 42845 to the crankshaft balancer.

    3. Important: Apply the lubricant that comes with J 42845 each time the tool is used. Failure to lubricate the J 42845 may prevent the balancer from installing completely.

  3. Using J 42845 install the balancer.
  4. Tighten the J 42845 until the crankshaft balancer is completely seated against the crankshaft sprocket.

    5. Object Number: 639542 Size: SH
  5. Remove the J 42845 from the crankshaft.

    6. Object Number: 470799 Size: SH

    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.

  6. Install the crankshaft bolt and washer to the crankshaft.

    7. Tighten
    Tighten the crankshaft balancer bolt to 255 N·m (189 lb ft).

  7. Remove the J 42847 .
  8. Install the starter motor. Refer to Starter Motor Replacement .
  9. Install the fan. Refer to Fan Replacement .
  10. Install the A/C belt. Refer to Air Conditioning Compressor Belt Replacement .