Exhaust stud

Any advise on removing a broken exhaust stud from my 750. Already broke on drill bit.

 

Call around for a machinist's quote. I had a guy do 3 for 25 dollars although the head was off. They have a trick of some kind or he wouldn't have done it that cheap. He said he welded a stud to it and the heat from welding it makes it screw out easier.

 

Thanks for the advise, will have to ask around.

 

I just got mine back from the machine shop this morning. The guy had to cut out the surrounding of the studs and melt aluminum in them. 2 of them were broken, also had him remove the rest of them.
With the head off, it cost me $60. Chacal has good deals on head gasket sets too if you need.

 

If they quote you too much, and you're confident, you could drill out the stud with a quarter inch (If I remember they're 6mm???) bit
and use a helicoil set to fix it......

That's an Absolute last-case-scenario.

 

you know a machinist effed up when he calls for the tig welder.

If the head is off it's easy to fixture it up on the table (drill press or manual mill) and do a much better job with the EZout than you can ever do in your garage (or kitchen for some of us schmucks).

The back filling and re-tapping (or drill out and helicoil) is what you do when you botch that. (probably you "forgot" to spot drill it or thought a stub drill would do fine and it wandered off the broken stud into the soft aluminum)

Depending on whether the stud was broken above or too far below flush determines if you can weld something to it to grab on to and just unscrew it and yes, heat cycling it helps.

In fact I'd recommend hitting it with the deep creep, drilling for the EZout, hitting it with some more PBblaster, making a sammich, more PBblaster, eating the sammich, then hitting it with the torch for a minute, next extinguish the fire you just started, heating it a bit more, another squirt of deep creep THEN trying the EZout bit.