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 45059  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: Using J 21465-13 & J 36996 To Install Balance Shaft Into Engine Block
Courtesy of GENERAL MOTORS CORP.
2. Install the balance shaft retainer.
Fig 2: Balance Shaft Retainer
Courtesy of GENERAL MOTORS CORP.
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).

4. Install the balance shaft driven gear.
Fig 3: Balance Shaft Driven Gear
Courtesy of GENERAL MOTORS CORP.
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 45059  to tighten the bolt an additional 70 degrees.

6. Using J 8001  measure the balance shaft end play. End play must not exceed 0.028 mm (0.008 in).
Fig 4: Using J 8001 To Measure 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).
Fig 5: Using J 8001 To Measure Balance Shaft Radial Play
Courtesy of GENERAL MOTORS CORP.
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.
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: Using J 8001 To Measure Gear Lash
Courtesy of GENERAL MOTORS CORP.