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Home >> Chevrolet >> 2011 >> Corvette ZR-1 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 6.2L Or 7.0L - Repair Instructions - Off Vehicle (3 Of 5) >> Timing Chain and Sprocket Installation (6.2L LS3)

Timing Chain and Sprocket Installation (6.2L LS3)

Special Tools

For equivalent regional tools, refer to Special Tools

    Fig 1: View Of Crankshaft Key & Keyway
    GM156149Courtesy of GENERAL MOTORS CORP.
  1. Install the key into the crankshaft keyway, if previously removed.
    2. Fig 2: Crankshaft Key
    GM1272887Courtesy of GENERAL MOTORS CORP.
  2. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.
    3. Fig 3: View Of Crankshaft Sprocket
    GM1658182Courtesy of GENERAL MOTORS CORP.
  3. Install the crankshaft sprocket (207) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
    4. Fig 4: View Of Crankshaft Sprocket & Installer
    GM1658237Courtesy of GENERAL MOTORS CORP.
  4. Use the J 41478:  installer (1) and the J 41665:  installer (2) in order to install the crankshaft sprocket.

    Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

  5. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.
    6. Fig 5: View Of Compressed Tensioner
    GM1658249Courtesy of GENERAL MOTORS CORP.
  6. Compress the timing chain tensioner guide and install the EN 46330:  pin.
    7. Fig 6: View Of Timing Chain Tensioner
    GM1658251Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Fastener Caution .
  7. Install the timing chain tensioner (232) and bolts (231). Tighten the timing chain tensioner bolts to 30 N.m (22 lb ft).
    8. Fig 7: View Of Camshaft Sprocket & Timing Chain
    GM1658265Courtesy of GENERAL MOTORS CORP.
    NOTE:
    • The sprocket teeth and timing chain must mesh.
    • The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.
    • Do not use the camshaft sprocket bolt again. Install a NEW bolt during assembly.
  8. Install the camshaft sprocket (205), timing chain (208), and a NEW bolt (206).
    9. Fig 8: Identifying Camshaft & Crankshaft Marks
    GM1658268Courtesy of GENERAL MOTORS CORP.
  9. Inspect the sprockets for proper alignment. The mark on the camshaft sprocket (1) should be located in the 6 o'clock position and the mark on the crankshaft sprocket (2) should be located in the 12 o'clock position.
    10. Fig 9: Locating Tensioner Pin
    GM1658271Courtesy of GENERAL MOTORS CORP.
  10. Remove the EN 46330:  pin.
    11. NOTE: Do not apply threadlock to the flex plate bolts at this time.
  11. Temporarily install the automatic transmission flex plate or manual transmission flywheel and bolts. Refer to Engine Flywheel Installation (6.2L LS3) .
    12. Fig 10: Flywheel Holding Tool
    GM1559840Courtesy of GENERAL MOTORS CORP.
  12. Install the J 42386-A:  holding tool and bolts. Use 1 M10-1.5 x 120 mm bolt and 1 M10-1.5 x 45 mm bolt for proper tool operation. Tighten the J 42386-A:  holding tool bolts to 50 N.m (37 lb ft).
    13. Fig 11: Tightening Camshaft Sprocket Bolt
    GM1658274Courtesy of GENERAL MOTORS CORP.
  13. Tighten the camshaft sprocket bolt.
    • Tighten the camshaft sprocket bolt a first pass to 75 N.m (55 lb ft):  .
    • Tighten the camshaft sprocket bolt a final pass an additional 50 degrees using the J 45059:  meter.
  14. Remove the J 42386-A:  holding tool and bolts.
  15. Remove the automatic transmission flex plate or manual transmission flywheel and bolts. Refer to Engine Flywheel Removal (6.2L LS3) .
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