GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 42846 Crankshaft Protector Button


    Object Number: 1150711  Size: SH
  1. Measure the camshaft timing chain free play. If the chain can be moved back and forth in excess of 16 mm (0.625 in), replace the chain and sprockets.
  2. Remove the camshaft sprocket bolts.
  3. Remove the camshaft sprocket and the timing chain.

  4. Object Number: 639535  Size: SH
  5. Install the J 42846  (1) into the end of the crankshaft.
  6. Remove the crankshaft sprocket using a three jaw puller (2).