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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 2.4L) >> Repair Instructions - On Vehicle >> Camshaft Timing Chain, Sprocket, and Tensioner Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Upper Timing Chain Guide Bolts
    GM2660813Courtesy of GENERAL MOTORS COMPANY
  1. Remove the camshaft cover. Refer to Camshaft Cover Replacement (LUK)  or Camshaft Cover Replacement (LEA) .
  2. Remove the number 1 cylinder spark plug. Refer to Spark Plug Replacement .
  3. Rotate the crankshaft in the engine rotational direction clockwise, until the number 1 piston is at top dead center (TDC) on the exhaust stroke.
  4. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  5. Remove the upper timing chain guide bolts (1) and guide (2).
    6. Fig 2: Timing Chain Tensioner
    GM2660814Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The timing chain tensioner must be removed to unload chain tension before the timing chain is removed. If it is not, the timing chain will become cocked and it will be difficult to remove.

  6. Remove the timing chain tensioner (1).
    7. Fig 3: Exhaust Camshaft Sprocket
    GM1578298Courtesy of GENERAL MOTORS COMPANY
  7. Install a 24 mm wrench on the hex on the exhaust camshaft in order to hold the camshaft.
  8. Remove and discard the exhaust camshaft actuator bolt (2).
  9. Remove the exhaust camshaft actuator (1,3) from the camshaft and timing chain.
    10. Fig 4: Timing Chain Tensioner Guide Bolt And Guide
    GM2660816Courtesy of GENERAL MOTORS COMPANY
  10. Remove the timing chain tensioner guide bolt (1) and guide (2).
    11. Fig 5: Fixed Timing Chain Guide Access Plug
    GM2660818Courtesy of GENERAL MOTORS COMPANY
  11. Remove the fixed timing chain guide access plug (1).
    12. Fig 6: Fixed Timing Chain Guide Bolts And Guide
    GM2660822Courtesy of GENERAL MOTORS COMPANY
  12. Remove the fixed timing chain guide bolts (1) and guide (2).
    13. Fig 7: Timing Chain & Camshaft Position Actuator
    GM1578297Courtesy of GENERAL MOTORS COMPANY
  13. Install a 24 mm wrench on the hex on the intake camshaft in order to hold the camshaft.
  14. Remove and discard the intake camshaft actuator bolt (1).
  15. Remove the intake camshaft actuator (3), and the timing chain through the top of the cylinder head.
    16. Fig 8: View of Friction Washer and Timing Chain Drive Sprocket
    GM2128110Courtesy of GENERAL MOTORS COMPANY
    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.

  16. Remove the outer friction washer (1) if equipped.
  17. Ensure the crankshaft gear timing mark (2) is in the 5 o'clock position and crankshaft key is in the 12 o'clock position.
  18. Remove the crankshaft sprocket (3).
  19. Remove the inner friction washer (1).
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