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Home >> Buick >> 2015 >> Verano Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 2.4L (Lea)) >> Repair Instructions - On Vehicle >> Camshaft Timing Chain, Sprocket, and Tensioner Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying Proper Exhaust/Intake Camshaft Alignment positions
    GM1825076Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If equipped with one the following engine; LE5, LE9, LAT, LNF, LDK, LHU, LTD, LBN, or 2010 LAF, ensure the intake camshaft notch is in the 5 o'clock position and the exhaust camshaft notch is in the 7 o'clock position and beyond.

  1. Ensure the intake camshaft notch is in the 5 o'clock position (2) and the exhaust camshaft notch is in the 7 o'clock position (1). The number 1 piston should be at top dead center (TDC), crankshaft key at 12 o'clock.
    2. Fig 2: Camshaft Notches
    GM2224131Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If equipped with following engine; LAP, LE8, LEA, LUK, or 2011 LAF, ensure the intake camshaft notch is in the 10 o'clock position and the exhaust camshaft notch is in the 7 o'clock position and beyond.

  2. Ensure the intake camshaft notch is in the 10 o'clock position (2) and the exhaust camshaft notch is in the 7 o'clock position (1). The number 1 piston should be at top dead center (TDC), crankshaft key at 12 o'clock.
    3. Fig 3: 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. The proper mark is also in line with a semicircular notch in the inner diameter of the gear.

  3. Install the inner friction washer (1).
  4. Install the crankshaft sprocket with the timing mark (2) is in the 5 o'clock position and facing outward.
  5. Install the outer friction washer (1) if equipped.
    6. Fig 4: Identifying Colored Links On Timing Chain
    GM1594347Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • There are 3 colored links on the timing chain. Two links are of matching color, and 1 link is of a unique color. Use the following procedure to line up the links with the actuators. Orient the chain so that the colored links are visible.
    • Always use new actuator bolts.
  6. Assemble the intake camshaft actuator into the timing chain with the timing mark lined up with the uniquely colored link (1).
    7. Fig 5: Identifying Cylinder Head Opening
    GM1825082Courtesy of GENERAL MOTORS COMPANY
  7. Lower the timing chain through the opening in the cylinder head. Use care to ensure that the chain goes around both sides of the cylinder block bosses (1, 2).
  8. Install the intake camshaft actuator onto the intake camshaft while aligning the dowel pin into the camshaft slot.
  9. Hand tighten the new intake camshaft actuator bolt.
    10. Fig 6: Lining Up First Pink Link With Timing Mark On Crankshaft Sprocket
    GM1594349Courtesy of GENERAL MOTORS COMPANY
  10. Route the timing chain around the crankshaft sprocket and line up the first matching colored link (1) with the timing mark on the crankshaft sprocket, in approximately the 5 o'clock position.
  11. Install the friction washer, if applicable.
    12. Fig 7: Adjustable Timing Chain Guide
    GM1403949Courtesy of GENERAL MOTORS COMPANY
  12. Rotate the crankshaft clockwise to remove all chain slack. Do not rotate the intake camshaft.
    13. CAUTION:

    Refer to Fastener Caution .

  13. Install the adjustable timing chain guide (2) down through the opening in the cylinder head and install the adjustable timing chain bolt (1). Tighten the adjustable timing chain guide bolt to 10 N.m (89 lb in).
    14. Fig 8: Camshaft Actuator
    GM1403953Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Always install NEW actuator bolts (1).

  14. Install the exhaust camshaft actuator (2) into the timing chain with the timing mark lined up with the second matching colored link.
    15. Fig 9: Aligning Timing Mark On Actuator With Last Pink Colored Link
    GM1594351Courtesy of GENERAL MOTORS COMPANY
  15. Install the exhaust camshaft actuator onto the exhaust camshaft, aligning the dowel pin into the camshaft slot.
  16. Use 24 mm open ended wrench, rotate the exhaust camshaft approximately 45 degrees until the dowel pin in the camshaft actuator goes into the camshaft slot.
    17. Fig 10: Identifying Cam Actuator, Camshaft & Chain
    GM1403887Courtesy of GENERAL MOTORS COMPANY
  17. When the actuator seats on the cam, tighten the new exhaust camshaft actuator bolt hand tight.
    18. Fig 11: Identifying Chain & Sprockets
    GM1889129Courtesy of GENERAL MOTORS COMPANY
  18. Verify that all of the colored links and the appropriate timing marks are still aligned. If they are not aligned, repeat the portion of the procedure necessary to align the timing marks.
    19. Fig 12: View Of Fixed Timing Chain Guide
    GM412165Courtesy of GENERAL MOTORS COMPANY
  19. Install the fixed timing chain guide and bolts. Tighten the fixed timing chain guide bolts to 12 N.m (106 lb in).
    20. Fig 13: Upper Timing Chain Guide
    GM1403955Courtesy of GENERAL MOTORS COMPANY
  20. Install the upper timing chain guide and bolts. Tighten the upper timing chain guide bolts to 10 N.m (89 lb in).
    21. Fig 14: Compressing Timing Chain Tensioner
    GM797246Courtesy of GENERAL MOTORS COMPANY
  21. Reset the timing chain tensioner by performing the following steps:
    1. Remove the snap ring.
    2. Remove the piston assembly from the body of the timing chain tensioner.
    3. Remove the sealing collar from the piston assembly.
    4. Install the EN-45027-2  tool (2) into a vise.
    5. Install the notch end of the piston assembly into the EN-45027-2  tool (2).
    6. Using the EN-45027-1  tool (1), turn the ratchet cylinder into the piston.
    7. Reinstall the sealing collar to the piston assembly.
    8. Reinstall the piston assembly into the body of the tensioner.
    9. Install the snap ring.
    22. Fig 15: View Of Timing Chain Tensioner
    GM1769723Courtesy of GENERAL MOTORS COMPANY
  22. Inspect the timing chain tensioner seal for damage. If damaged, replace the seal.
  23. Inspect to ensure all dirt and debris is removed from the timing chain tensioner threaded hole in the cylinder head.
    24. NOTE:

    Ensure the timing chain tensioner seal is centered throughout the torque procedure to eliminate the possibility of an oil leak.

  24. Install the timing chain tensioner assembly. Tighten the timing chain tensioner to 75 N.m (55 lb ft).
  25. The timing chain tensioner is released by compressing it 2 mm (0.079 in), which will release the locking mechanism in the ratchet. To release the timing chain tensioner, use a suitable tool with a rubber tip on the end. Feed the tool down through the cam drive chest to rest on the cam chain. Then give a sharp jolt diagonally downwards to release the tensioner.
    26. Fig 16: View Locking Tool
    GM2128100Courtesy of GENERAL MOTORS COMPANY
  26. Install EN-48953  locking tool (1) and tighten the bolts into the cylinder head to 10 N.m (89 lb in).
  27. Using a torque wrench, tighten the camshaft actuator bolt to 30 N.m (22 lb ft) plus 100 degrees using the EN-45059  meter.
  28. Remove the EN-48953  locking tool.
    29. Fig 17: View Of Oil Nozzle & Bolt
    GM412200Courtesy of GENERAL MOTORS COMPANY
  29. Install the timing chain oiling nozzle (2). Tighten the timing chain oiling nozzle (1) bolt to 10 N.m (89 lb in).
    30. Fig 18: View Of Timing Chain Guide Bolt Access Hole & Plug
    GM1769728Courtesy of GENERAL MOTORS COMPANY
  30. Apply sealant compound to the thread of the timing chain guide bolt access hole plug. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  31. Install the timing chain guide bolt access hole plug. Tighten the access hole plug to 75 N.m (55 lb ft).
  32. Install the engine front cover. Refer to Engine Front Cover Replacement .
  33. Install the camshaft cover. Refer to Camshaft Cover Replacement .
  34. Install the number 1 cylinder spark plug. Refer to Spark Plug Replacement .
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