Balance Shaft Installation

Tools Required 

• J 8001  Dial Indicator Set
• J 21465-13  Drive Handle Extension
• J 36660-A  Torque Angle Meter
• J 36996  Balance Shaft Installer

1. Use J 21465-13 and J 36996  to install the balance shaft into the engine block.
   Fig 1: Install Balance Shaft Using J 21465 & J 36996

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

   Tighten 

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

   Fig 2: Install Balance Shaft Retainer & Bolts

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

   Tighten 

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

   Fig 3: Install Balance Shaft Driven Gear & 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: Measure Balance Shaft End Play Using J 8001

   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.
    Fig 5: Measure Balance Shaft Radial Play At Rear Using J 8001

    Courtesy of GENERAL MOTORS CORP.
17. Install the timing chain and camshaft sprocket.
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: Measure Gear Lash Using J 8001

    Courtesy of GENERAL MOTORS CORP.