No such luck Mark, I survived. Stay put. I was repairing a broken bottom right corner of a L20B front cover. Welding (torch brasing actually) aluminum is fun. I had to build up new metal then file it back into shape. The busted out corner was long gone. PO had just put a large blob of RTV in the hole.... Sheesh
Ok, I hacked it off just between the flange and the pinion housing. This is past where the end of the steel inner tube seats in the aluminum.
Then I couldn't resist trying to separate the aluminum housing off of the steel tube. I drilled out the remaining metal in the two holes and heated the housing. Had the MAP torch out from doing the front cover repair. It came right off.
A point of note here, as I was heating the aluminum housing to expand it, molten plastic stuff began boiling out of the two holes. Well after it came apart (easy, quite loose), it was apparent where that molten plastic came from.
Both the steel tube and the inside of the housing have a groove, that was filled with that plastic stuff. Here is the picture with the remains of it in the groove after I picked at it.
Here is the groove on the steel part.
This leaves me a bit perplexed. I drilled through metal for sure in both holes to get to the ID. But to fill that groove with plastic, you would have to have the outer hole open to the OD and groove of the steel tube to fill it. So maybe the groove space is injection filled, then some metal is pressed in to the holes lock the two metal together. I think the plastic is a moisture seal between the two. I would have just used a dang o-ring....
The aluminum housing was not a tight fit onto the steel tube. I can tap it back on now that it's off with just a little effort. It would definitely rely on the pin/metal in those holes to prevent rotation.
And here is the remains of the metal pin/plug after I drilled it out.
So I suppose for Mark's Powder coating melted plastic, there may be a moisture path in or grease path out if the plastic filled groove is not full anymore. Just a little silicon at the housing/tube junction might prevent anything from going either way. No rotation prevention is likely comprimised though.