Timing Chain and Sprockets Installation

Tools Required 

J 41665  Crankshaft Balancer and Sprocket Installer

1. Install the key into the crankshaft keyway, if previously removed.
   Fig 1: Installing Key Into Crankshaft Keyway

   Courtesy of GENERAL MOTORS CORP.
2. Tap the key (1) into the keyway until both ends of the key bottom onto the crankshaft.
   Fig 2: Tapping Key Into Keyway

   Courtesy of GENERAL MOTORS CORP.
3. Install the crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
   Fig 3: Aligning Crankshaft Key

   Courtesy of GENERAL MOTORS CORP.
4. Use the J 41665  in order to install the crankshaft sprocket.

   Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

   Fig 4: Installing Crankshaft Sprocket

   Courtesy of GENERAL MOTORS CORP.
5. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.

   Important: 

   • Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole.
   • The sprocket teeth and timing chain must mesh.
   • The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

     Locate the camshaft sprocket alignment mark in the 6 o'clock position.

6. Install the camshaft sprocket and timing chain.
   Fig 5: Installing Camshaft Sprocket And Timing Chain

   Courtesy of GENERAL MOTORS CORP.
7. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
   Fig 6: Aligning Timing Marks

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Refer to FASTENER NOTICE .
8. Install the camshaft sprocket bolts.

   Tighten 

   Tighten the camshaft sprocket bolts to 35 N.m (26 lb ft).