I'm assuming you have the dip stick removed from the outer sleeve while doing this, correct?
The outer sleeve casing has a rolled area that is there for a stop, to prevent it from sliding further into the block, You need to get your self a flat punch, or a good flat head screw driver and pry between the block and the rolled hump on the casing, and that will separate the casing where you can wiggle it and rotate it to where it will slide up and out.
Thats how I did it.