Balancer Chain, Sprocket and Tensioner Removal

Special Tools 

EN-50837  Timing Chain Tensioner Retraction Tool

1. Remove the balancer chain tensioner bolt (1).
   Fig 1: Balancer Chain Tensioner Bolt

   Courtesy of GENERAL MOTORS COMPANY
2. Remove the balancer chain tensioner (2).
3. Compress and lock the tensioner using EN-50837  retention tool.
   1. Insert EN-50837  retention tool into the lever arm and push in a clockwise direction.
   2. Compress the tensioner while holding lever arm.
   3. Relax the force on the lever and tensioner slightly, allowing the tensioner to extend 3 ratchet clicks and then hold in place.
   4. Pull lever counterclockwise using EN-50837  retention tool until the hole in the lever aligns with the hole in the tensioner assembly. Push the point of EN-50837  retention tool through the lever and into the tensioner assembly.
4. Remove the balancer chain guide bolt (1).
   Fig 2: Balancer Chain Guide Bolt

   Courtesy of GENERAL MOTORS COMPANY
5. Remove the balancer chain guide (2).
6. Use an open end wrench over flat on balance shaft while loosening balancer shaft sprocket bolt. Remove and discard the balancer shaft driven sprocket bolt (1).
   Fig 3: Balancer Shaft Driven Sprocket Bolt

   Courtesy of GENERAL MOTORS COMPANY
7. Remove the crankshaft key (1).
   Fig 4: Balancer Shaft Driven Sprocket And Balancer Chain

   Courtesy of GENERAL MOTORS COMPANY
8. Remove the crankshaft sprocket, balancer shaft driven sprocket and balancer chain (2) simultaneously.