How do I get this cylinder housing off? See pics

[jdl25]

I got it off,

I used a sharp chisel with a long taper and tapped it into the seam on one corner. The corner lifted immediately and I was able to get a pry bar in to it at that point.

I cleaned up the piston and cylinder. The cylinder has a rough spot on it. I am hoping that the lift will work.

 

[Mace Canute]

I think thats a good idea, maybe lift it higher also.
I noticed at the rear, you could possibly get a "paint scraper" of some sort in-between the gaskets.
Maybe some sort of "degrease spray" sprayed in the cracks and at the back section,
where it can seep between the gaskets.

It is surprising just how good a job those things do at separating parts that are glued together at the mating surface. They're fairly stiff and you don't have to beat the snot out of them to get them to work.