w124 92 Merc 300D 2.5 turbo diesel tensioner removal?

[blan]

Hey guys,
I'm a newbie. Bought my first Mercedes 300D diesel yesterday. It's a 1992 2.5 turbo with a few issues but I think the price was right.
The car tossed its old serpentine belt and the old owner cracked the tensioner off right where the pulley bolt attaches. I am attempting to remove the old tensioner to grab a part number and replace it but the thing does not want to come off. I removed everything from it including the big retaining circlip but it still doesn't budge.
Am I missing something here? I tried a couple of pry bars to pop it loose but I don't want to create any new problems (like a cracked timing chain cover) so I'm tentative about applying any real pressure. Is it common for these bearings to get rusted on the shaft that they sit on? Is a special tool or puller required normally for removal?
Any info is appreciated.