GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 43650 Balance Shaft Bearing Remover and Installer

Removal Procedure


    Object Number: 1830644  Size: SH
  1. Remove the radiator. Refer to Radiator Replacement .
  2. Remove the condenser. Refer to Air Conditioning Condenser Replacement .
  3. Remove the timing chain, sprocket and tensioner. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .
  4. Important: DO NOT remove the bolt holding the sprocket.

  5. Remove the left exhaust balance shaft bolt (2).

  6. Object Number: 1830645  Size: SH
  7. Remove the left exhaust balance shaft.

  8. Object Number: 630329  Size: SH

    Notice: Proper centering of the tool is required on the balance shaft bushing. If the tool is not properly centered then damage to the bearing bore and block will occur.

  9. Install the J 43650 into the balance shaft hole. Insert the tool with the foot parallel to the shaft, (right side shown, left side similar).

  10. Object Number: 630323  Size: SH
  11. When the J 43650 is inserted in the block, turn the J 43650 so that the foot becomes perpendicular to the shaft.
  12. Center the foot of the J 43650 on the balance shaft bushing.
  13. Once the J 43650 is centered on the balance shaft bushing, then insert the centering guide into the front balance shaft bore and tighten the nut with an appropriate wrench.
  14. When the J 43650 is properly installed, before removing the bushing, the end of the tool should be 116 mm (4.6 in) (a) from the block face.

    If the J 43650 is less than approximately 114 mm (4.5 in) (a), recheck the tool alignment.


    Object Number: 630336  Size: SH
  15. Tighten the nut on the J 43650 until the tension releases. When the tension releases, remove the J 43650 and the balance shaft bushing, (right side shown, left side similar).

Installation Procedure

Important: Service the balance shaft as an assembly. DO NOT disassemble or assemble the balance shaft.


    Object Number: 598032  Size: SH
  1. Install the balance shaft bushing using the J 43650 , (right side shown, left side similar).

  2. Object Number: 598033  Size: SH
  3. Seat the balance shaft busing into the bore using the J 43650 and a wrench.
  4. When the J 43650 is fully seated in the engine block, remove it with a wrench.

  5. Object Number: 1830645  Size: SH

    Important: If the balance shafts are not properly timed to the engine, the engine may vibrate or make noise.

  6. Install the balance shaft to the engine using the following steps:
  7. 4.1. Place the number one cylinder at top dead center (TDC).
    4.2. Lubricate the balance shaft lobes with engine oil.
    4.3. Install the left exhaust balance shaft.

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1830644  Size: SH
  8. Install the left exhaust balance shaft bolt (2).
  9. Tighten
    Tighten the bolt to 10 N·m (89 lb in).

  10. Install the timing chain, sprocket and tensioner. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .
  11. Install the condenser. Refer to Air Conditioning Condenser Replacement .
  12. Install the radiator. Refer to Radiator Replacement .