Timing Chain and Sprockets Installation

Tools Required 

• J 44221  Camshaft Holding Tool
• J 36660-A  Torque/Angle Meter

1. Install J 44221  with the camshaft flats up and the number 1 cylinder at top dead center.
   Fig 1: Installing Camshaft Holding Tool

   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 2: Aligning (Dark) Link Of Timing Chain With Timing Mark On Intake Camshaft Sprocket

   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 36660-A  to tighten the intake camshaft sprocket bolt the final pass an additional 100 degrees.
     Fig 3: Installing Intake Camshaft Sprocket Washer And New Bolt

     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 4: Installing Exhaust Camshaft Actuator Onto Exhaust Camshaft

    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.
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 36660-A  to tighten the exhaust camshaft actuator bolt the final pass an additional 135 degrees.
14. Unlock the tensioner.
15. Remove J 44221  .
    IMPORTANT: Rotate the camshaft actuator clockwise relative to the camshaft prior to tightening the bolt.
16. Rotate the camshaft actuator clockwise (as seen from the front of the vehicle).
    Fig 5: Rotating Camshaft Actuator Clockwise

    Courtesy of GENERAL MOTORS CORP.
17. The dark links (1) on the chain should be aligned with marks on sprockets as shown.
    Fig 6: Aligning Dark Links On Chain With Marks On Sprockets

    Courtesy of GENERAL MOTORS CORP.
18. Install the top chain guide.
19. Add threadlock GM P/N United States 12345498, GM P/N Canada 10953488 to the top chain guide bolt threads.
20. Install the top chain guide bolts.

    Tighten 

    Tighten the top chain guide bolts to 10 N.m (89 lb in).

    Fig 7: Installing Top Chain Guide

    Courtesy of GENERAL MOTORS CORP.