Balancer Chain, Sprocket, and Tensioner Removal

Special Tools 

EN-50837  Timing Chain Tensioner Retraction Tool

Fig 1: Balancer Chain Tensioner Bolt
Courtesy of GENERAL MOTORS COMPANY
1. 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 counterclockwise 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 clockwise 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.
Fig 2: Balancer Chain Guide Bolt
Courtesy of GENERAL MOTORS COMPANY
4. Remove the balancer chain guide bolt (1).
5. Remove the balancer chain guide (2).
Fig 3: Balancer Shaft Driven Sprocket Bolt
Courtesy of GENERAL MOTORS COMPANY
6. Use an 18 mm 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 4: Balancer Shaft Driven Sprocket And Balancer Chain
Courtesy of GENERAL MOTORS COMPANY
7. Remove the crankshaft key (1).
8. Remove the crankshaft sprocket, balancer shaft driven sprocket, and balancer chain (2) simultaneously.