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Installation Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Hold tension to the camshaft timing chain with 2 hands.
    Fig 1: Camshaft Timing Chain
    GM3216241Courtesy of GENERAL MOTORS COMPANY
    NOTE: A second technician is required.
  2. Set the crankshaft in direction of engine rotation to 60 degrees (a) before TDC of cylinder 1. Use the EN-45059  angle meter and the crankshaft balancer absorber bolt (1).
    Fig 2: Engine Rotation To 60 Degrees (a) Before TDC Of Cylinder 1
    GM3216238Courtesy of GENERAL MOTORS COMPANY
    NOTE: A second technician is required.
  3. Lay the camshaft timing chain between the timing chain guides.
  4. Coat with MoS 2 lubricating paste or engine oil. Refer to Adhesives, Fluids, Lubricants and Sealers .
    Fig 3: Exhaust Camshaft
    GM4310271Courtesy of GENERAL MOTORS COMPANY
  5. Install the exhaust camshaft (1).
  6. Install the 5 exhaust camshaft bearing caps (4) to the cylinder head.
    NOTE: Note the identification marking on the camshaft bearing cover.
  7. Install the exhaust bearing front cap (3) to the cylinder head.
  8. Loosely install the 12 exhaust camshaft bearing cap bolts (2).
  9. Tighten the 12 exhaust camshaft bearing cap bolts (1) in sequence shown to 9 N.m (80 lb in), working from inside to outside in a spiral.
    Fig 4: Exhaust Camshaft Bearing Cap Bolts
    GM4310284Courtesy of GENERAL MOTORS COMPANY
    CAUTION: Refer to Fastener Caution .
  10. Install the exhaust camshaft position actuator adjuster (1).
    Fig 5: Exhaust Camshaft Position Actuator
    GM2968114Courtesy of GENERAL MOTORS COMPANY
  11. Mind the camshaft pin (2), the exhaust camshaft position actuator adjuster does fit in only one position.
  12. Install and hand tighten a NEW exhaust camshaft position actuator adjuster bolt (3).
  13. Install the EN-51148  holding tool (1) to camshafts and to the cylinder head.
    Fig 6: Identifying Holding Tool Bolts
    GM3216249Courtesy of GENERAL MOTORS COMPANY
    1. Turn the camshafts at the camshaft position actuator adjuster bolts (5, 6) until the EN-51148  holding tool fits.
    2. Tighten the bolt (3) in the middle.
    3. Tighten the 2 outer bolts (2, 4).
  14. Tighten the exhaust camshaft position actuator adjuster bolts (6) in 2 passes:
    1. First pass to 65 N.m (48 lb ft).
    2. Final pass to an additional 120 - 135 degrees, using the EN-45059  meter.
  15. Hold tension to the camshaft timing chain with 2 hands.
    Fig 7: Camshaft Timing Chain
    GM3216237Courtesy of GENERAL MOTORS COMPANY
    NOTE: Second technician is required.
  16. Adjust the engine to cylinder 1 top dead center (TDC) of combustion stroke. Set crankshaft in direction of engine rotation until the markings (2) and (3) line up. Rotate at the crankshaft balancer absorber bolt (1).
    Fig 8: Crankshaft Balancer Alignment Marks
    GM3213250Courtesy of GENERAL MOTORS COMPANY
    NOTE: Second technician is required.
  17. Install the camshaft timing chain to the camshaft position actuator adjuster.
    Fig 9: Camshaft Position Actuator Adjuster Marks
    GM3216240Courtesy of GENERAL MOTORS COMPANY
  18. Ensure that the self-made colored links (1, 2) match to the marks on the camshaft position adjuster actuators.
  19. Timing Chain Tensioner Replacement  - Install
  20. Push the timing chain guide - left side (2) in the direction of the arrow.
    Fig 10: Timing Chain Guide And Tensioner
    GM2968108Courtesy of GENERAL MOTORS COMPANY
  21. Remove the 2 mm drill bit or equivalent (3) from the tensioner (1).
  22. Loosen the EN-51148  holding tool bolts (2, 3, 4).
    Fig 11: Identifying Camshaft Holding Tool Bolts
    GM2968105Courtesy of GENERAL MOTORS COMPANY
  23. Remove the EN-51148  holding tool (1).
  24. Timing Chain Upper Guide Replacement  - Install
  25. Check the position of the crankshaft, camshaft and camshaft position actuator adjuster.
    1. Turn crankshaft 720 degrees in the direction of engine rotation by the crankshaft balancer absorber bolt.
    2. Adjust the engine to cylinder 1 top death center (TDC) of combustion stroke. Set crankshaft in direction of engine rotation until the markings (2) and (3) line up. Rotate at the crankshaft balancer absorber bolt (1).
      Fig 12: Crankshaft Balancer Alignment Marks
      GM3213250Courtesy of GENERAL MOTORS COMPANY
    3. Install the EN-51148  holding tool (1) to camshafts and to the cylinder head.
      Fig 13: Identifying Camshaft Holding Tool Bolts
      GM2968105Courtesy of GENERAL MOTORS COMPANY
      1. Tighten the bolt (3) in the middle.
      2. Tighten the 2 both outer bolts (2, 4).
    4. If EN-51148  holding tool can be installed, the engine timing is properly adjusted.
    5. Remove the middle bolt (3) and the 2 outer bolts (2, 4 and remove the EN-51148  holding tool (1).
  26. Engine Front Cover Replacement - Upper  - Install
  27. Camshaft Cover Replacement  - Install
  28. Front Wheelhouse Liner - Right Side - Install Front Wheelhouse Liner Replacement
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