I find no parts manual in my files for your motor.
Assuming you removed any screws, cotter keys, etc.
that are normal found in these old motors, the exhaust
tube is probably somewhat pressed into the housings,
but more likely stuck from old carbon, etc.,
Heat, wood block, and hammer may suffice?
I have a couple of photos of my Johnson 100…… not
sure how similar that is to the 110.
I can’t really tell much from the photos though.
Prepare to be boarded!