I have removed the rear main seal wear ring before by distorting it with a cold chisel, but recently saw a Cat distorter tool for a 3116 and looking for the part number for the larger 3406E engines.
I looked up a 3406E at random (5EK-prefix) and it calls for a slide hammer. This procedure seems to apply to all 3406E. Is that what you were thinking of.?
5p7409 is the distorter but you will need the ring that fits in seal bore Nige it is to remove wear ring on crankshaft
I have a 5EK and a 6TS, Changing the front main now, but the tool works for both, gearing up for future endeavors. I found this for a Detroit.
Serial Number
I should have picked up on that. He's wanting to remove the sleeve, not the seal.
For early style--later seal is unitized, uses same installation tools.