Balance Shaft Installation

Tools Required

• J 8092 Universal Driver Handle
• J 36996  Balance Shaft Installer. See Special Tools and Equipment .
• J 45059  Angle Meter. See Special Tools and Equipment .

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: Installing Balance Shaft
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: View of Balance Shaft Retainer & Bolts
Courtesy of GENERAL MOTORS CORP.
4. Install the balance shaft driven gear onto the balance shaft.
Fig 3: Locating Balance Shaft Driven Gear
Courtesy of GENERAL MOTORS CORP.
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. Use a wrench to secure the balance shaft.

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

   2. Install the balance shaft driven gear bolt.

      Tighten: 

      1. Tighten the balance shaft driven gear bolt on the first pass to 20 N.m (15 lb ft).
      2. Tighten the balance shaft driven gear bolt on the final pass using the J 45059  an additional 35 degrees.

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: View Of 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: Engine Camshaft Timing Mark
Courtesy of GENERAL MOTORS CORP.
11. Remove the balance shaft drive gear.
Fig 6: View Of Balance Shaft Drive Gear
Courtesy of GENERAL MOTORS CORP.
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: Balance Shaft & Timing Mark
Courtesy of GENERAL MOTORS CORP.
13. Position the balance shaft drive gear onto the engine camshaft.
Fig 8: Positioning Balance Shaft Drive Gear Onto Engine Camshaft
Courtesy of GENERAL MOTORS CORP.
14. Look to ensure that the balance shaft drive gear and the balance shaft driven gear timing marks are aligned.