GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Corvette 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Crankshaft Balancer Cleaning and Inspection

    Object Number: 63153 Size: SH
  1. Clean the crankshaft balancer in solvent.
  2. Using a wire brush, clean the belt grooves of all dirt and debris.
  3. Dry the crankshaft balancer with compressed air.
  4. Inspect the crankshaft balancer for the following conditions:
    5. • Loose or improperly installed balance weights
      A properly installed balance weight should be installed flush or below flush with the face of the balancer.
    • Worn, grooved, or damaged hub seal surface
      A crankshaft balancer hub seal surface with excessive scoring, grooves, rust or other damage must be replaced.
      Minor imperfections on the hub seal surface may be removed with polishing compound or fine grade emery cloth.

       Note: In order for the belt to track properly, the belt grooves should be free of all dirt and debris.

    • Dirty or damaged belt grooves
      The balancer belt grooves should be free of any nicks, gouges, or other damage that may not allow the belt to track properly.
      Minor imperfections may be removed with a fine file.
    • Worn, chunking or deteriorated rubber between the hub and pulley

Replacing the Crankshaft Balancer and Balance Weights

    Object Number: 63153 Size: SH

    Note: The position of the crankshaft balancer must be marked before removal, relative to the crankshaft. The balancer does not use a key or keyway for positioning. Mark or scribe the end of the crankshaft and the balancer before removal. The crankshaft balancer must be installed to the original position. If replacing the crankshaft balancer, note the location of any existing balance weights, if applicable. Crankshaft balancer weights must be installed into the new balancer in the same location as the old balancer. A properly installed balance weight is flush or below flush with the face of the balancer.

  1. Inspect the crankshaft balancer weight holes for any existing balance weights.

    2. Warning: Refer to Safety Glasses Warning in the Preface section.


    Object Number: 1669848 Size: SH
  2. Using a punch, position the balance weights in the old balancer (1) to the bottom of the weight holes.
  3. With a marking crayon, note the weight holes (2) containing balance weights, if applicable.
  4. Lay the old crankshaft balancer (1) on a bench or flat table.

    5. Rotate the old balancer until 1 of the marked balance weight holes (2) is in the 12 o'clock position.

  5. Lay the new crankshaft balancer (6) on the bench next to the old balancer.

    6. Rotate the new balancer until 1 of the balance weight holes (4) is in the 12 o'clock position.

  6. With a marking crayon, mark the new balancer weight hole (4) located in the 12 o'clock position.
  7. Viewing the old balancer, note the position of the crankshaft-to-balancer alignment mark (3).
  8. Mark the new balancer in the same location (5).
  9. Measure the distance from the top of the balance weights to the face of the old crankshaft balancer.
  10. Record the readings.
  11. Determine the proper balance weight size for the new balancer. Balance weights are available in 3 different sizes.
    12. • A balance weight hole depth that measures 13.0 mm (0.512 in), has a short balance weight in the hole. A short balance weight measures 12.7 mm (0.5 in) in length.
    • A balance weight hole depth that measures 6.69 mm (0.263 in), has a medium balance weight in the hole. A medium balance weight measures 19.0 mm (0.75 in) in length.
    • A balance weight hole depth that measures 0.29 mm (0.011 in), has a long balance weight in the hole. A long balance weight measures 25.4 mm (1.0 in) in length.
  12. Insert new crankshaft balance weights of the proper size into the new balancer in the same location as the old balancer.

    13. A properly installed balance weight is flush or below flush with the face of the balancer.