Timing Chain and Sprockets Removal

Tools Required 

J 5825-A  Crankshaft Gear Remover. See Special Tools and Equipment .

1. Remove the crankshaft position sensor reluctor ring.
Fig 1: Removing Crankshaft Position Sensor Reluctor Ring
Courtesy of GENERAL MOTORS CORP.
2. Remove the timing chain tensioner shoe (229) using a downward motion.
3. Remove the timing chain tensioner bracket bolt and bracket (227 and 228).
Fig 2: Removing Timing Chain Tensioner Shoe, Bracket & Bolt
Courtesy of GENERAL MOTORS CORP.
4. Check the camshaft timing chain free play.
   1. Rotate the camshaft sprocket (1) counterclockwise until all slack is removed from the camshaft timing chain (2).
   2. Measure the free play on the slack side (3) of the camshaft timing chain.

      If the camshaft timing chain can be moved side to side in excess of 11 mm (0.43 in), replacement of the camshaft timing chain and the sprockets is recommended during assembly.

Fig 3: Camshaft Sprocket, Timing Chain & Slack Side
Courtesy of GENERAL MOTORS CORP.
5. Remove the camshaft sprocket bolts.
Fig 4: Removing Camshaft Sprocket Bolts
Courtesy of GENERAL MOTORS CORP.
6. Remove the camshaft sprocket and the camshaft timing chain.
Fig 5: Removing Camshaft Sprocket & Timing Chain
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
7. Remove the crankshaft sprocket using the J 5825-A  .
Fig 6: J 5825-A
Courtesy of GENERAL MOTORS CORP.
8. Remove the crankshaft balancer key.
Fig 7: Removing Crankshaft Balancer Key
Courtesy of GENERAL MOTORS CORP.