For 4-stroke engines with straight-cut piston rings.
Our unistress piston ring expander UPRE is a tool designed to open straight-cut piston rings on 4-stroke engines. Each type of UPRE has been provided with a stop. The stop limits the deformation of the piston ring to a minimum, still allowing the piston ring to slip over piston diameter.
Honing machine for restoration of medium speed engine cylinder liner geometry and surface structure.