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Exhaust Stud Extraction
Posted 11 July 2007 - 07:16 AM
The stud has snapped off with about 20mm protruding from head so i am hoping to be able to get a good purchase on it when i've got the manifold off.
Has anybody a recommendation for a brand of stud extractor that they've used and would be the best option.
Posted 11 July 2007 - 07:48 AM
If you have 20mm or so sticking out then you want something like this
Also heat up the area of the cylinder head around the stud with a blow torch as it will make it much easier to get the remains out due the differing expansion rates of alloy and steel.
I managed to get a broken M10 tap out from one of my rear caliper brackets by heating it up and plenty of oil, and that snapped off below the surface!!!!!
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Knowledge is power .................... apparently.
Posted 11 July 2007 - 11:12 AM
Scientists investigate that which already is; Engineers create that which has never been." - Albert Einstein
Posted 11 July 2007 - 08:21 PM
i'll get the extractor ordered later.
Posted 12 July 2007 - 12:24 AM
Also, I would not use the type of extractor that you drill a small hole in the bolt and twist in-if the extractor breaks, it will be nearly impossible to drill out the hardened tool steel.
I have worked on many corroded marine engines in the past. Sometimes you can file "flats" on both sides of the stud and get a wrench or vice grip on it. If all else fails, then grind it flat, center punch it, and drill it out. I think cobalt drill bits work the best. I never had any luck with the yellow tungsten coated.
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