Tools Required

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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.

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 .
Use the J 36996 and the J 8092 in order to install the balance shaft.

Fig 1: Install Balance Shaft Using J 36996 & J 8092
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE .
Install the balance shaft retainer and bolts.
Tighten

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

Fig 2: Install Balance Shaft Retainer & Bolts
Courtesy of GENERAL MOTORS CORP.
Install the balance shaft driven gear onto the balance shaft.
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.
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: Install Balance Shaft Driven Gear & Bolt
Courtesy of GENERAL MOTORS CORP.
Remove the wrench from the balance shaft.
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.
Install the balance shaft drive gear.

Fig 4: Installing Balance Shaft Drive Gear
Courtesy of GENERAL MOTORS CORP.
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 Timing Mark On Balance Shaft Drive Gear
Courtesy of GENERAL MOTORS CORP.
Remove the balance shaft drive gear.

Fig 6: Removing Balance Shaft Drive Gear
Courtesy of GENERAL MOTORS CORP.
Rotate the balance shaft so that the timing mark on the balance shaft driven gear is in the 6 o'clock position.

Fig 7: Timing Mark Position
Courtesy of GENERAL MOTORS CORP.
Position the balance shaft drive gear onto the engine camshaft.
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 Gear & Balance Shaft Driven Gear Timing Marks
Courtesy of GENERAL MOTORS CORP.