Tools Required

J 5825-A  Crankshaft Gear Remover

1. Remove the crankshaft position sensor reluctor ring.
   Fig 1: Removing Crankshaft Position Sensor Reluctor Ring

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2. Check the camshaft timing chain free play.
   1. 2.1. Rotate the camshaft sprocket (1) counterclockwise until all slack is removed from the camshaft timing chain (2).
   2. 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 2: Camshaft Sprocket, Timing Chain & Slack Side Of Timing Chain

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3. Remove the camshaft sprocket bolts.
   Fig 3: Removing Camshaft Sprocket Bolts

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4. Remove the camshaft sprocket and the camshaft timing chain.
   Fig 4: Removing Camshaft Sprocket & Camshaft Timing Chain

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   CAUTION: Refer to SAFETY GLASSES CAUTION .
5. Remove the crankshaft sprocket using the J 5825-A. 
   Fig 5: Remove Crankshaft Sprocket Using J 5825-A

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6. Remove the crankshaft balancer key.
   Fig 6: Removing Crankshaft Balancer Key

   Courtesy of GENERAL MOTORS CORP.