Howdy folks. Somewhat new to posting around here so I'm not sure if this is a topic for the modification/refurb forums or the powerboating forums. Figured I'd try here first.
Background: I'm refurbishing an outboard jet lower unit (OBJ model AF). Presently I have the thing entirely stripped down except I can't separate the exhaust tube from the jet volute. Highlighted part 13 in the schematic below. I removed the exhaust clip but the tube itself seems to be seized. Not sure if it's corrosion, sediment, carbon build up or just, well, friction. I about gave myself a hernia tugging on the thing with a pair of channel locks.
Several generous applications of PB Blaster did not yield any results. So I soaked the whole volute in a tub of solvent for a couple days. It cleaned up real nice, but the tube still won't come out with any amount of force I can easily apply.
Questions: Has anyone encountered any difficulty replacing the exhaust tube on an OBJ and have a solution? Should it just slide out in an ideal world? How about any recommendations on a product that will penetrate/dissolve whatever buildup is giving it such a death grip?