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Replacing Timing Chain & Sprockets: Removal

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the engine front cover. Refer to Replacing Engine Front Cover .
    2. Fig 1: Aligning Timing Chain & Sprocket Timing Marks
    GM192708Courtesy of GENERAL MOTORS CORP.
  2. Align the timing marks on the sprockets so that they are as close as possible.
    3. Fig 2: Timing Chain Dampener & Bolt
    GM153593Courtesy of GENERAL MOTORS CORP.
  3. Remove the timing chain dampener bolt.
  4. Remove the timing chain dampener.
    5. Fig 3: Camshaft Sprocket Bolt
    GM248088Courtesy of GENERAL MOTORS CORP.
  5. Remove the camshaft sprocket bolt.
    6. Fig 4: Camshaft Sprocket & Timing Chain
    GM153596Courtesy of GENERAL MOTORS CORP.
  6. Remove the camshaft sprocket and the timing chain.
    7. IMPORTANT: If the sprocket does not come off easily, a light blow on the lower edge of the sprocket with a plastic mallet should dislodge the sprocket.
  7. Remove the crankshaft sprocket.
    8. Fig 5: Balance Shaft Drive Gear
    GM97869Courtesy of GENERAL MOTORS CORP.
  8. Remove the balance shaft drive gear in order to access the camshaft thrust plate.
    9. Fig 6: Camshaft Thrust Plate & Bolts
    GM190552Courtesy of GENERAL MOTORS CORP.
  9. Remove the camshaft thrust plate bolts, if required.
  10. Remove the camshaft thrust plate, if required.
    11. Fig 7: Balance Shaft Driven Gear & Bolt
    GM97868Courtesy of GENERAL MOTORS CORP.
  11. Remove the balance shaft driven gear bolt, if required.
  12. Remove the balance shaft driven gear, if required.
  13. Clean and inspect all of the timing components for wear and damage. Refer to Timing Chain and Sprockets Cleaning & Inspection (L26) .
  14. If the pistons have been moved in the engine, use the following procedure:
    1. Turn the crankshaft so that the number one piston is at top dead center.
    2. Turn the camshaft so that, with the sprocket temporarily installed, the timing mark is straight down.
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