Need help with Cat 3406C rear main seal

Working on what's supposed to be a 4CK Cat 3406C motor. Got the front main seal installed no problem and working on the rear main on now and having trouble. The part number I have for the front and rear seal is 1425868, the CAT part # is 2W-1734 and that supposedly crosses over to 1425868.

The seal seems to be the right one however there is a lip on the rear of the crankshaft that is the same diameter as the inner part of the rear main seal and that is preventing the seal from going on anymore than maybe 1/16"

Here's a few photos:

In this photo you can see the lip on the crank


This is as far as the seal goes on


This is the seal and the crank


The front seal went on no problem then again there was no lip on the front of the crank.

Any ideas? We've tried everything we can think of and we're just about at wit's end.

Thanks for the help!

 

Appears to be part of the crank, the lip is only about 1/8" in length...If this is the old wear sleeve how do I get it off?

 

The old seal was a little bit different looking, then again it came out in about 6 different pieces. I'm about 99% sure this is part of the crank itself. It's one continuous piece all the way around the crank with no breaks or splits in it.

Here's two hi res photos of the lip:

 

Gotcha. I take it that the installer tool just uses brute force to press the new seal over and past the wear ring or does the wear ring get removed and reinstalled?

The manual for this engine really doesn't go into too much detail on this subject. Thanks again for the help!