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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 737 (Engine Mechanical - 2.2L (L61)) >> Repair Instructions - On Vehicle >> Camshaft Timing Chain, Sprocket, and Tensioner Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the camshaft cover. Refer to Camshaft Cover Replacement .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Remove the No. 1 cylinder spark plug. Refer to Spark Plug Replacement .
  4. Rotate the crankshaft in the engine rotational direction clockwise, until the No. 1 piston is at top dead center (TDC) on the compression stroke.
  5. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  6. Lower the vehicle.
    7. Fig 1: Identifying Timing Chain Tensioner
    GM412158Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The timing chain tensioner must be removed to unload chain tension before the timing chain is removed. If not removed, the timing chain will become cocked and it will be difficult to remove.
  7. Remove the timing chain tensioner.
    8. Fig 2: View Of Fixed Timing Chain Guide Access Plug
    GM412164Courtesy of GENERAL MOTORS CORP.
  8. Remove the fixed timing chain guide access plug.
    9. Fig 3: View Of Fixed Timing Chain Guide
    GM412165Courtesy of GENERAL MOTORS CORP.
  9. Remove the fixed timing chain guide.
    10. Fig 4: View Of Upper Timing Chain Guide
    GM758269Courtesy of GENERAL MOTORS CORP.
  10. Remove the upper timing chain guide.
    11. Fig 5: Using 24 mm Wrench To Align Camshaft
    GM412536Courtesy of GENERAL MOTORS CORP.
  11. Use a 24 mm wrench to hold the camshafts from turning.
    12. Fig 6: Identifying Exhaust Camshaft Sprocket
    GM412168Courtesy of GENERAL MOTORS CORP.
  12. Remove the exhaust camshaft sprocket bolt and discard.
  13. Remove the exhaust camshaft sprocket.
    14. Fig 7: View Of Timing Chain Tensioner Guide
    GM412160Courtesy of GENERAL MOTORS CORP.
  14. Remove the timing chain tensioner guide.
    15. Fig 8: View Of Intake Camshaft Sprocket And Chain
    GM412169Courtesy of GENERAL MOTORS CORP.
  15. Remove the intake camshaft sprocket bolt and discard.
  16. Remove the intake camshaft sprocket.
  17. Remove the timing chain through the top of the cylinder head.
    18. Fig 9: View Of Crankshaft Sprocket
    G00573015Courtesy of GENERAL MOTORS CORP.
    NOTE: Ecotec 4 cylinder engines with SIDI-Direct Injection, the lower timing chain crank gear may be equipped with a second spacing washer installed in front of the lower timing chain crank gear. The outer spacer/washer is in between the crank/balancer pulley and the lower timing gear and may remain in place when the pulley is removed. The spacer/washer has a dot/mark on its surface that may be mistaken for the lower timing mark. If applicable, the washer must be removed in order to view the correct timing mark on the lower crank gear.
  18. Remove the outer friction washer (1) if equipped.
  19. Ensure the crankshaft gear timing mark (2) is in the 5 o'clock position and crankshaft key is in the 12 o'clock position.
  20. Remove the crankshaft sprocket (3).
  21. Remove the inner friction washer (1).
    22. Fig 10: View Of Oil Nozzle & Bolt
    GM412200Courtesy of GENERAL MOTORS CORP.
  22. Remove the oil nozzle and bolt.
    23. Fig 11: Identifying Balance Shaft Drive Chain Tensioner
    GM412201Courtesy of GENERAL MOTORS CORP.
  23. Remove the balance shaft drive chain tensioner.
    24. Fig 12: View Of Adjustable Balance Shaft Chain Guide
    GM412413Courtesy of GENERAL MOTORS CORP.
  24. Remove the adjustable balance shaft chain guide.
    25. Fig 13: Exploded View Of Small Balance Shaft Drive Chain Guide
    GM412414Courtesy of GENERAL MOTORS CORP.
  25. Remove the small balance shaft drive chain guide.
    26. Fig 14: View Of Upper Balance Shaft Drive Chain Guide
    GM412415Courtesy of GENERAL MOTORS CORP.
  26. Remove the upper balance shaft drive chain guide.
    27. Fig 15: Identifying Upper Balance Shaft Drive Chain/Sprocket
    GM412417Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: It may ease removal of the balance shaft drive chain to get all of the slack in the chain between the crankshaft and water pump sprockets.
  27. Remove the balance shaft drive chain.
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