Special Tool

EN-49941:  Remover / Installer Piston Retainer Ring

For equivalent regional tools, refer to Special Tools .

Fig 1: Removing/Installing Piston Rings Using Piston Ring Pliers
Courtesy of GENERAL MOTORS CORP.
WARNING: Handle the piston carefully. Worn piston rings are sharp and may cause bodily injury.
1. Remove the piston rings. Use piston ring pliers (1)
Fig 2: Upper Compression Ring, Lower Compression Ring, Oil Rings And Oil Ring Spacer
Courtesy of GENERAL MOTORS CORP.
2. The piston rings are ordered as followed:
   • Upper compression ring (1)
   • Lower compression ring (2)
   • Oil rings and oil ring spacer (3) and (4)
3. Install the piston and connecting rod assembly to a bench vise. Use aluminium braces
Fig 3: Piston Pin Retainer, Remover And Notch
Courtesy of GENERAL MOTORS CORP.
WARNING: Use extreme care when removing snap rings. Always wear adequate eye protection in order to avoid personal injury.
4. Apply the EN-49941:  remover (1) in the notch (3) to the piston pin retainer (2) and remove it.
Fig 4: Connecting Rod, Piston And Piston Pin
Courtesy of GENERAL MOTORS CORP.
5. Remove the piston pin (2) and the connecting rod (3) from the piston (1).