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Registered
Join Date: Jan 2001
Location: Troy, Michigan, USA
Posts: 62
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Exhaust Stud Thread Size, etc?
Hello again,
I thought I was on the home straight with my engine rebuild, until I mounted my SSIs, and one of the exhaust studs decided to strip the thread from the head rather than tighten. I am suspicious that this was a previous botched repair, because the stud is different from the others. Initial thought is to use a helicoil insert, but before I commit, I need to confirm the thread size and pitch. I think the portion of the stud that goes into the head is 8mm with a 1.25 thread pitch. Is this correct? Thanks in advance Mark |
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03-20-2004, 04:56 PM
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Who is John Galt?
Join Date: Jun 2003
Location: Knoxville, TN
Posts: 638
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Yes. Good luck.
__________________
'79 911sc Targa '02 slk230 kompressor '84 Tamiya Falcon A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship. The average age of the world's greatest civilizations has been 200 years. |
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03-20-2004, 06:01 PM
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Registered
Join Date: Sep 2003
Location: Monterey, CA
Posts: 138
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yes you are correct. It is M8 X 1.25 pitch. I had the same problem and i used a stud that had 2 differents sizes threads on both ends. It was a M10 in one end (the end that goes into the head ) and the other end was M8 and the pitches at both end are 1.25.
It worked great. It retapped the hole in head to a larger size M10 to accomodate the new stud. Tell me what you think. I would try first to rethread the hole, thought, before i go with M10. I did it only at last resort. truly, filou. My engine was 2.7 L 74. |
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03-23-2004, 07:50 PM
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Registered
Join Date: Jan 2001
Location: Troy, Michigan, USA
Posts: 62
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Thanks for the confirmation.
Helicoil repair kit for 8mm x 1.25 kit arrived in post today. I will attempt the repair this weekend. I had considered a composite 10mm,8mm stud, but didn't know where to source such a thing. I suppose I could use a 10mm,10mm stud and drill the exhaust manifold, but then the barrel nut wouldn't fit. I will go with the helicoil and report back. Mark |
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03-25-2004, 06:05 PM
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