Since the cylinder head, #62, has already been removed, you can get a better view of the pistons and maybe the rings if you remove the intake bypass covers, #’s 54 and 55 in the diagram. If the rings are exposed, you should be able to push them in slightly using a small punch or screwdriver. This is also a good place to pour in some of your favorite penetrating oil if you suspect the rings are frozen to the cylinder walls.
