Balancer Chain, Sprocket, and Tensioner Removal

Special Tools 

EN-50837  Timing Chain Tensioner Retraction Tool

1. Courtesy of GENERAL MOTORS COMPANY

   Remove the balancer chain tensioner bolt (1).

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. Courtesy of GENERAL MOTORS COMPANY

   Remove the balancer chain guide bolt (1).

5. Remove the balancer chain guide (2).

6. Courtesy of GENERAL MOTORS COMPANY

   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).

7. Courtesy of GENERAL MOTORS COMPANY

   Remove the crankshaft key (1).

8. Remove the crankshaft sprocket, balancer shaft driven sprocket, and balancer chain (2) simultaneously.