Head stud nut threaded to far?

[crashr]

Alright here is my delema. I removed all of the head stud nuts except for one. I can't seem to get it out because whoever worked on the engine last threaded the nut so far down that the head stud is nearly flush with the top of the nut???

I can't get the allen key to grab hold of it...

What are my options??????

[Bobboloo]

That's weird. Either the stud is in backwards or it isn't threaded all the way into the case or they left off a washer.

One thing would be to torque the other three nuts back onto their studs while the motor is cold. Then heat up the problem nut with a torch and quickly see if you can back it off with the wrench. Try to focus the torch on the nut without hitting the head as much as possible. If the cam tower is still attached then torque all the other studs on that bank before you heat and try to back out the nut.

The only other thing I can think of is to find a pipe the same diameter as the nut. Weld a nut onto one end and weld the other end of the pipe to the problem nut on the stud. There won't be much room but the nut is only held on by 25 ft/lbs so a couple of tacks might do it.

Any body else have an idea?

P.S. I just noticed that your car is a 75'. Is your motor a 2.7? If so the other cause might be that the stud pulled and someone kept torqueing a pulled stud. If that's the case then you might end up pulling the stud with the nut. Which would mean casesavers anyway. Try grabbing it with some pliers and see if it pulls out.

[stormcrow]

Drill out a portion of the stud so the allen head can go down into the nut. Probably what happened is when the nut was installed, it went on pretty easy so it was screwed down just about all the way. Now that it has been on the engine for quite some time, it's set. Also try some penetrating oil.

Steve

"A Porsche does more then just go fast in a straight line"

[Tom F2]

It sounds like the washers may have been left out, or it may be that the head studs were not threaded in deeply enough. This can happen when they are changed by people who don't know to check the installed length. It's supposed to be 136.5 mm, or something like that. (I don't have the spec nearby.)

You may be able to get it loose by removing the other three nuts first. This should release the tension and enable you to get the wrench engaged enough to start it moving. I've gotten lucky the few times I've encountered what you describe.

[john walker's workshop]

sometimes you can get a little more depth by grinding out a concave dimple on the end of the allen bit. a dremel or some other small grinder would have to be used.

[crashr]

That's what I figureed I would have to do. I will atempt to drill slightly down into the head stud and see if I can get the allen key to bite. Thanks for the help all. I'll let you know how it goes.

[yelcab1]

I would drill slowly into the stud to create some room. Use an allen bit in a socket, pound it in there and see if it will engage enough.

Of course, you will replace that stud, right? It is probably stretched