Timing Chain & Sprockets - Removal

Tool 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

   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.
Fig 2: Timing Chain Components
Courtesy of GENERAL MOTORS CORP.
3. If removing the camshaft, remove the camshaft position sensor.
4. Use the J 22888-20A  to remove the crankshaft sprocket.
   Fig 3: Crankshaft Sprocket

   Courtesy of GENERAL MOTORS CORP.