Timing Chain and Sprockets Installation

Tools Required

• J 44221  Camshaft Holding Tool
• J 45059  Angle Meter

Fig 1: View Of J 44221 Installed On Camshafts
Courtesy of GENERAL MOTORS CORP.
1. Install J 44221  with the camshaft flats up and the number 1 cylinder at top dead center. The crankshaft pin should be at 12 o'clock when the number 1 piston is at top dead center.
Fig 2: View Of Timing Chain & Sprockets
Courtesy of GENERAL MOTORS CORP.
2. Compress the tensioner and lock in place.
3. Install the crankshaft sprocket.
4. Install the intake camshaft sprocket into the timing chain.
5. Align the (dark) link of the timing chain with the timing mark on the intake camshaft sprocket (1).
6. Feed the timing chain down through the opening in the head.
7. Install the timing chain onto the crankshaft sprocket. Align the (dark) link of the timing chain with the timing mark on the crankshaft sprocket (2).
IMPORTANT: It may be necessary to remove J 44221  to rotate and hold the camshaft (hex) to align the pin to the camshaft sprocket.
8. Install the intake camshaft sprocket onto the intake camshaft.
Fig 3: View Of Intake Camshaft Sprocket Washer & Bolt
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice in Cautions and Notices.
9. Install the intake camshaft sprocket washer and new bolt.

   Tighten: 

   • Tighten the new intake camshaft sprocket bolt the first pass to 20 N.m (15 lb ft).
   • Use J 45059  to tighten the intake camshaft sprocket bolt the final pass an additional 100 degrees.

Fig 4: View Of Exhaust Camshaft Actuator
Courtesy of GENERAL MOTORS CORP.
10. Install the exhaust camshaft actuator into the timing chain.
11. Align the (dark) link of the timing chain with the timing mark on the exhaust camshaft actuator (1).
IMPORTANT: It may be necessary to remove J 44221  to rotate and hold the camshaft (hex) to align the pin to the camshaft sprocket.
12. Install the exhaust camshaft actuator onto the exhaust camshaft.
Fig 5: Identifying Camshaft Actuator
Courtesy of GENERAL MOTORS CORP.
NOTE: The camshaft actuator must be fully advanced during installation. Engine damage may occur if the camshaft actuator is not fully advanced.
IMPORTANT: Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
13. Install the new exhaust camshaft actuator bolt.

    Tighten: 

    • Tighten the new exhaust camshaft actuator bolt the first pass to 25 N.m (18 lb ft).
    • Use J 45059  to tighten the exhaust camshaft actuator bolt the final pass an additional 135 degrees.

14. Unlock the tensioner.
15. Remove J 44221  .
Fig 6: Identifying Chain Alignment Links
Courtesy of GENERAL MOTORS CORP.
16. The dark links (1) on the chain should be aligned with marks on sprockets as shown.
Fig 7: View Of Exhaust Camshaft Sensor
Courtesy of GENERAL MOTORS CORP.
17. Lube the exhaust camshaft position sensor bore with clean engine oil.
18. Install and seat the exhaust camshaft position sensor.
19. Install the exhaust camshaft position sensor bolt.

    Tighten:  Tighten the exhaust camshaft position sensor bolt to 10 N.m (89 lb in).

Fig 8: View Of Intake Camshaft Sensor
Courtesy of GENERAL MOTORS CORP.
20. Lube the intake camshaft position sensor bore with clean engine oil.
21. Install and seat the intake camshaft position sensor.
22. Install the intake camshaft position sensor bolt.

    Tighten:  Tighten the intake camshaft position sensor bolt to 10 N.m (89 lb in).