Broken exhaust stud - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 39 (permalink) Old 05-28-2019, 04:42 PM
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A lot of the problem with aftermarket studs is they can have a different heat/expansion/contraction ratio. That can cause broken studs,loosening nuts, etc. whatever you use make sure its heat characteristics are compatible with your aluminum head and exhaust manifold. My Nissan had this issue from the factory. I replaced them with 300ZX studs and cured the problem.
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post #32 of 39 (permalink) Old 05-29-2019, 04:20 AM
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BTW,

How did you repair the broken stud?

Vin

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post #33 of 39 (permalink) Old 05-29-2019, 04:50 AM
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Refer to post 29..... it was M.I.A......
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post #34 of 39 (permalink) Old 06-03-2019, 12:05 PM Thread Starter
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This problem is now resolved, and I’m a very happy guy.

After failing to identify where the exhaust was rubbing on the chassis, I built some wooden stands to get the car high enough so I could have a proper look. The car fell off my jack stands a couple of weeks ago and I don’t feel good about using them for any lifts beyond 6” or so anymore. Thank heavens, there was no damage to the car. Oh, and I’m ok too.

A close look quickly revealed no contact between exhaust and chassis. Hmm, weird. Motor mounts are tight, too. Can’t be the exhaust after all, it seems.

So I refreshed my memory on the prybar-as-stethoscope trick on this forum and on YouTube, and went at it. A couple minutes later I had traced the source of the vibration to the sump, getting more and more depressed as I honed in on it.

Then I noticed, “the sump does get kind of close to that transverse chassis brace (the one painted in body color, on all cars I presume, or is it just mine?) — maybe there’s some rubbing there, somehow, even though the relative positions of sump and chassis couldn’t really have changed.

Crawling right under there, I start looking. Plenty of clearance. Hey, what’s that? Motherbrother.... the missing exhaust stud is wedged solid between sump and chassis brace, transmitting engine vibration directly to the chassis.

I wrestled it out with some needle nose pliers. It was really jammed in there.

Start ‘er up, never sounded better, winds up smooth as a turbine.

Thanks to all who gave their technical and moral support!

Incidentally, @SkiBum, your point is well taken. On replacing the missing stud I discovered another one that was very, very loose. Both are now replaced with original studs cannibalized from my old cylinder head. Lesson learned!
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post #35 of 39 (permalink) Old 06-03-2019, 02:39 PM
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Thumbs up!

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post #36 of 39 (permalink) Old 06-03-2019, 03:26 PM
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Awesome! I got a good audible laugh when you said you found the MIA stud...glad you found it and all is A-OK!
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post #37 of 39 (permalink) Old 06-03-2019, 03:51 PM
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Thanks for posting your final solution, so many don't often after much input from this BB and that PMO.

ciao

Ken
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post #38 of 39 (permalink) Old 06-03-2019, 06:42 PM
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Quote:
Originally Posted by kengta View Post
Thanks for posting your final solution, so many don't and that PMO often after much input from this BB.

ciao

Ken
+1

Unfinished threads is a pet peeve of mine.

Thank you,

Vin
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post #39 of 39 (permalink) Old 06-04-2019, 07:02 AM Thread Starter
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It bugs me too when a 3-page thread includes every detail about a problem except the solution, even when a solution was clearly found years ago. The value of the forum is immeasurably higher when threads end conclusively.
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