Balance Shaft Installation

Tools Required 

• J 8092  Universal Driver Handle
• J 36660-A  Torque Angle Meter
• J 36996  Balance Shaft Installer

Important:  The balance shaft and the balance shaft front bearing are serviced only as an assembly. Do not remove the balance shaft front bearing from the balance shaft.

1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, to the balance shaft front bearing.
   CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
2. Use the J 36996  and the J 8092  in order to install the balance shaft.
   Fig 1: Using J 8092 & J 36996

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
3. Install the balance shaft retainer and bolts.

   Tighten 

   Tighten the bolts to 12 N.m (106 lb in).

   Fig 2: Installing Balance Shaft Retainer

   Courtesy of GENERAL MOTORS CORP.
4. Install the balance shaft driven gear onto the balance shaft.
5. If reusing the fastener, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the balance shaft driven gear bolt.
6. Install the balance shaft driven gear bolt.
   1. 6.1. Use a wrench to secure the balance shaft.

      Place the wrench onto the balance shaft near to the balance shaft front bearing.

   2. 6.2. Install the balance shaft driven gear bolt.

      Tighten 

      1. 6.2.1. Tighten the balance shaft driven gear bolt on the first pass to 20 N.m (15 lb ft).
      2. 6.2.2. Tighten the balance shaft driven gear bolt on the final pass using the J 36660-A  an additional 35 degrees.
         Fig 3: Installing Balance Shaft Driven Gear Bolt

         Courtesy of GENERAL MOTORS CORP.
7. Remove the wrench from the balance shaft.
8. Rotate the balance shaft by hand in order to ensure that there is clearance between the balance shaft and the valve lifter pushrod guide. If the balance shaft does not rotate freely, check to ensure that the retaining ring on the balance shaft front bearing is seated on the case.

   Important:  DO NOT install the camshaft sprocket bolts at this time.

9. Install the balance shaft drive gear.
   Fig 4: Installing Balance Shaft Drive Gear

   Courtesy of GENERAL MOTORS CORP.
10. Rotate the engine camshaft so that the timing mark on the balance shaft drive gear is in the 12 o'clock position.
    Fig 5: Identifying Engine Camshaft Timing Mark

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11. Remove the balance shaft drive gear.
    Fig 6: Removing Balance Shaft Drive Gear

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12. Rotate the balance shaft so that the timing mark on the balance shaft driven gear is in the 6 o'clock position.
    Fig 7: Identifying Balance Shaft Timing Mark

    Courtesy of GENERAL MOTORS CORP.
13. Position the balance shaft drive gear onto the engine camshaft.
14. Look to ensure that the balance shaft drive gear and the balance shaft driven gear timing marks are aligned.
    Fig 8: Aligning Balance Shaft Drive & Driven Gear

    Courtesy of GENERAL MOTORS CORP.