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 United States 12345610, GM P/N Canada 993193, or equivalent, to the balance shaft front bearing.
2. Use the J 36996  and the J 8092  in order to install the balance shaft.
   Fig 1: Installing Balance Shaft

   Courtesy of GENERAL MOTORS CORP.
3. Install the balance shaft retainer and bolts. Tighten the bolts to 12 N.m (106 lb in ).
   Fig 2: Balance Shaft Retainer & Bolts

   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 United States 12345382, GM P/N Canada 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.
      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: Balance Shaft Driven Gear

         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: 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: Balance Shaft Drive Gear Timing Mark

    Courtesy of GENERAL MOTORS CORP.
11. Remove the balance shaft drive gear.
12. Rotate the balance shaft so that the timing mark on the balance shaft driven gear is in the 6 o'clock position.
    Fig 6: Balance Shaft Driven Gear 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 7: Aligning Balance Shaft Drive & Driven Gear Timing Marks

    Courtesy of GENERAL MOTORS CORP.