Broken Thermostat housing stud ??PrestoneThermostat??

[zacritz929]

One of the studs for my thermostat housing is broke off. How can I get it out and where can I buy a replacement one from? Also I went to Murrays to get a new Thermo and bought a Prestone one. It seems smaller then the stock one and it only has 1 of what I think are called jiggle valves. Did they give me a SLO thermo?

 

[SHOtimer]

You can buy replacement studs at Napa..... They often break, from age and overtorque. The best replacement is the Ford thermostat. Other thermostat's will 'work', but Ford's flows/fits/and works the best with the SHO motor.

Doug

 

[zacritz929]

How do I get the old studs out?

 

[rangerj]

I agree with the above regarding the thermostat, that is get a Motorcraft one. Getting the broken stud or bolt out can be very difficult. The location is difficult to work in. There are a couple of choices and they both require drilling into the broken stud or bolt. You MUST drill into the center of the broken stud so it is important to either center punch it or be exceptionally careful with the drill bit.

You can use a right handed drill bit and then use an "easy out" to extract the broken piece. The other way is to use an extraction tool, available from Sears or other tool sellers, that uses a left handed drill bit and an extractor that is built into the tool. The bit drills into the broken piece and when you are deep enough the extractor bites and the piece is turned counter clockwise, that is in the removal direction. Again it is VERY important to be in the center of the broken piece.

A third alternative is to drill out the broken piece and re-tap the hole with the next size up threads. This may not be practical. If at all possible remove the piece that has the broken stud so you can work on it on a work bench. If this is not practical then get as much out of the way as is practical so you can work on it.

 

[zacritz929]

Well the stud sticks out about 1/2" from the block so would I be able to get it out with maybe vise grips?

 

[SHOtimer]

Well the stud sticks out about 1/2" from the block so would I be able to get it out with maybe vise grips?

I'm sure you could try that. Are their any threads left? If so you can put two nuts on it so that they lock and then turn the stud out.

Doug

 

[zacritz929]

I'm sure you could try that. Are their any threads left? If so you can put two nuts on it so that they lock and then turn the stud out.

Doug

Ya theres quite some threads left. Could you please explain how I can use two nuts to pull it out?

 

[rangerj]

Sorry, I thought you had a stud or bolt broken off flush with the surface. As stated above if you have exposed threads youu can thread on two nuts. Thread the first one close to the metal that it is stuck in and then thread the second one on. Lastly, tighten the two against each other. This will lock them together. Then you put a wrench on the back nut and try to turn it and the broken stud or bolt out (counter clockwise). Do not use the vicegrips if you do not have to. After you put the two nuts on and tighten them together TAP in the end of the stud with a hammer. NOTE, I said TAP, not beat on it. You want to shock the threads and hopefully loosen the bi-metalic fusion ( I forgot the proper term) that has taken place. I am assuming that you have a steel bolt or stud threaded into aluminum.

Be patient, TAP on it and try turning it. If it will not turn, TAP on it some more and try again. Heat may be necessary, but this should be a last resort due to the location.