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Output Shaft Removal?

Posted: Mon Jul 22, 2019 1:23 pm
by canada karl
I have a parts car that I am trying to remove the output shaft from so I don't have to buy a new one ($450). The filister head screws are "really" locked in there and I am soaking the hell out of them with PB Blaster. They are 8 MM screws as far as I can tell? I tried breaking them free with a 3/8s socket wrench and pipe but no go. Wondering if an 8 mm impact socket would break them free? I don't want to round out the inside head of the fillister screw.
Any advice most appreciated.

Re: Output Shaft Removal?

Posted: Tue Jul 23, 2019 7:24 pm
by canada karl
Well i got the output shaft out.I got the filister head screws to move by putting a a floor jack under the breaker bar with the 8mm socket. Only rounded off two screw heads that I ended up cutting off. Are there no backyard mechanics on this forum or does everyone just take their car to the shop???

Re: Output Shaft Removal?

Posted: Tue Jul 23, 2019 10:17 pm
by Mike W.
Nope, see to some of us rust is just a theoretical concept. :D

I have been known to resort to a Vice Grips on the head along with the socket at yards but I'm not sure that would have helped.

Re: Output Shaft Removal?

Posted: Mon Jul 29, 2019 3:06 pm
by waltb
I think most of us work on our own cars.

What you did is what you needed to do. I would have used either an air impact wrench with a good tight fitting 8mm hex bit and cleaning out the inside hex first or even my old hit it with a hammer impact driver with a good 8mm hex bit. You could have used some heat. You could have used a chisel to hit the outside of the head tangentially to hopefully crack them loose. There are many ways to get the rusted stuck inside hex bolts off. I find the air/electric/ manual impact wrenches tends to be better to break stuck bolts loose than breaker bars and slow and steady leverage. I think I have stripped and snapped more things using hand tools than when using impact wrenches. No matter what the wrench, the most important thing is to have a good high quality tight fitting hex bit.

Walt B.
'80 528i

Re: Output Shaft Removal?

Posted: Mon Jul 29, 2019 7:11 pm
by 528i-1981
And the one ingredient we so seldom seem to have much of .... patience and time. Squirting penetrating oil repeatedly and over time makes a big difference. But who has time for that ????? I only learned this from necessity - I had only a few seconds a day to obsess over a stuck rusted bolt over the course of a week. A squirt here, a squirt there. Next think you know, you're talking real rotation. Of course I have a 4-foot length of pipe that slips handily over my 1/2" breaker bar.