Balance Shaft Installation

Tools Required 

• J 8001  Dial Indicator Set. See Special Tools and Equipment .
• J 21465-13  Drive Handle Extension. See Special Tools and Equipment .
• J 36660-A  Torque Angle Meter. See Special Tools and Equipment .
• J 36996  Balance Shaft Installer. See Special Tools and Equipment .

1. Use J 21465-13  and J 36996  to install the balance shaft into the engine block.
   Fig 1: Installing Balance Shaft Into Engine Block

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

   Tighten 

   Tighten the balance shaft retainer bolts to 30 N.m (22 lb ft).

   Fig 2: Installing Balance Shaft Retainer & Bolts

   Courtesy of GENERAL MOTORS CORP.
4. Install the balance shaft driven gear.
   NOTE: Refer to SPECIAL FASTENER NOTICE in Cautions and Notices.
5. Install the balance shaft driven gear bolt.

   Tighten 

   Tighten the balance shaft driven gear bolt to 22 N.m (16 lb ft). Use J 36660-A  to tighten the bolt an additional 70 degrees.

   Fig 3: Installing Balance Shaft Driven Gear And Bolt

   Courtesy of GENERAL MOTORS CORP.
6. Using J 8001  measure the balance shaft end play. End play must not exceed 0.028 mm (0.008 in).
   Fig 4: Measuring Balance Shaft End Play

   Courtesy of GENERAL MOTORS CORP.
7. Using J 8001  measure the balance shaft radial play at the rear. Radial play must be between 0.0127-0.119 mm (0.0005-0.0047 in).
8. Install the balance shaft drive gear.
9. Install the camshaft sprocket.
10. Turn the camshaft so the timing mark on the camshaft sprocket is straight down.
11. Remove the camshaft sprocket and balance shaft drive gear.
12. Turn the balance shaft so the timing mark on the balance shaft driven gear points straight down.
13. Partially install the balance shaft drive gear so the gear teeth are not engaged.
14. Align the marks on the balance shaft driven gear and the balance shaft drive gear. Do this by turning the balance shaft.
15. Once marks are aligned, fully seat balance shaft drive gear and engage gear teeth.
16. Turn the crankshaft so the number one piston is at top dead center.
17. Install the timing chain and camshaft sprocket.
    Fig 5: Measuring Balance Shaft Radial Play

    Courtesy of GENERAL MOTORS CORP.
18. Using J 8001  measure the gear lash at four places. Measure every quarter turn. Gear lash must be between 0.050-0.127 mm (0.002-0.005 in).
    Fig 6: Measuring Gear Lash

    Courtesy of GENERAL MOTORS CORP.