Timing Chain and Sprockets Removal

Tools Required 

J 22888-20A  Crankshaft Gear Puller

Important:  Before removing the timing chain, measure the distance between the center of the hole in the bracket and the unworn surface of the timing chain tensioner shoe. The hole accepts a pin that holds the shoe in a retracted position to ease timing chain installation.

If the distance between the center of the hole and the unworn surface of the timing chain tensioner shoe is more than 8 mm (0.314 in), replace the tensioner, timing chain, and both sprockets.

1. Remove the timing chain tensioner bolts.
   Fig 1: Timing Chain Tensioner Bolts

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Do not replace only the tensioner or the chain to correct a noise condition caused by the camshaft drive components. When replacing the tensioner or chain to correct a noise condition all of the camshaft drive components must be replaced.
2. Remove the timing chain, the timing chain tensioner, and the camshaft sprocket at the same time.
3. If removing the camshaft, remove the camshaft position sensor.
   Fig 2: Timing Chain, Tensioner & Camshaft Sprocket

   Courtesy of GENERAL MOTORS CORP.
4. Use the J 22888-20A  to remove the crankshaft sprocket.
   Fig 3: Crankshaft Sprocket & J 22888-20A

   Courtesy of GENERAL MOTORS CORP.