A specialised tool for aiding in installing / removing the injector sleeve (21515329) on Volvo FM12 trucks.
For removing sleeves, put the 2-1 puller into the cylinder to reach the sleeve. Tighten the top nut to make the puller retain the sleeve. Install the 2-2 puller ring, and assembl the #1 puller. Screw top nut to remove the old sleeve.
For installing new sleeves, put the new sleeve into the 3-1 expander. Then install the 3-2 tap thread. Finally put the entire tool into the cylinder. Screw down the top nut to install the sleeve perfectly.