GM Service Manual Online
For 1990-2009 cars only

Timing Chain Tensioner Removal Camshaft

  1. Remove the spark plugs in order to make rotating the crankshaft to line up the timing marks easier.

  2. Object Number: 466546  Size: SH

    Important: 

       • Align the timing marks before disassembly.
       • Do not turn the camshafts and the crankshaft once the timing chain tensioner is removed. Valve and piston damage may occur.

  3. Rotate the crankshaft so that the following conditions are met:
  4. • The number 1 (frontmost) cylinder is at the top dead center (TDC) position on the compression stroke.
    • The keyway on the crankshaft (5) aligns with the mark on the engine block (4).
    • The arrow (3) on the idler sprocket is pointing upward.
    • The guide pins (1) on the camshaft sprockets line up with the notches (6) on the cylinder head.

    Object Number: 466579  Size: SH
  5. Relieve the tension on the camshaft timing chain by turning the intake camshaft slightly counterclockwise.
  6. Remove the nut and 2 bolts (1, 2).
  7. Remove the camshaft timing chain tensioner.
  8. Inspect the camshaft timing chain tensioner for wear, damage and correct operation. Replace as necessary.

Timing Chain Tensioner Removal Crankshaft

    Important: 

       • Ensure that the timing marks are correctly aligned before disassembly.
       • Do not turn the camshafts and the crankshaft once the timing chain tensioner is removed. Valve and piston damage may occur.


    Object Number: 464755  Size: SH
  1. Remove the 2 bolts (1) and the crankshaft timing chain tensioner.
  2. Inspect that the latch and teeth of the crankshaft timing chain tensioner are undamaged and that the tensioner functions correctly. Replace as necessary.