Installation Procedure

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.
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 

      Tighten the balance shaft driven gear bolt to 20 N.m (15 lb ft). Using the J 36660-A  rotate the balance shaft driven gear bolt an additional 35 degrees.

      Fig 3: Installing Balance Shaft Drive 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.
9. Install the balance shaft drive gear. DO NOT install the camshaft sprocket bolts at this time.
   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

    Courtesy of GENERAL MOTORS CORP.
11. Remove the balance shaft drive gear.
    Fig 6: Removing 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: Identifying 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.
15. Install the timing chain and the camshaft sprocket. Refer to Timing Chain and Sprockets Replacement   .
16. Install the engine front cover. Refer to Engine Front Cover Replacement  on page 6-312.
17. Install the valve lifter pushrod guide. Refer to Valve Lifter Replacement   .
18. Install the A/C condenser. Refer to CONDENSER REPLACEMENT in Heating, Ventilation and Air Conditioning.
19. Install the radiator. Refer to RADIATOR REPLACEMENT (4.3L) in Engine Cooling.
    Fig 8: Positioning Balance Shaft Drive Gear to Engine Camshaft

    Courtesy of GENERAL MOTORS CORP.