Please help. Loose exhaust manifold stud on cylinder #1

[mo-mon]

Hi. While investigating an exhaust leak, I noticed that one of my exhaust manifold studs was loose. I ordered a couple of studs (diff lengths) from PP & when I installed one, I couldn't torque it properly as it wouldn't tighten past finger tight. I think some threads have stripped.

What can I do for a temporary fix before I drop the engine next year? Loctite blue? Other methods? Please help. Thank you.

[Showdown]

You can drill out the hole and insert a timecrt. That’s what you’d do if the engine was out but it’s possible to do it with the engine in. Not terribly fun but doable.

I did it a few months ago.

https://forums.pelicanparts.com/porsche-911-technical-forum/1106768-when-well-enough-cant-left-alone-backdate-efi-itb-ac-more-28.html


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[mo-mon]

Thank you Showdown. Time to order the Stomski tool.

[Showdown]

If you need other drill collars for the Stomaki tool (I borrowed on so I don’t know what it comes with) you can get there here from granger. Outer diameter is 1/2”

https://www.grainger.com/category/machining/drilling-holemaking/drill-bushings/headed-press-fit-drill-bushings-h?attrs=Outside+Dia.%7C1%2F2+in&filters=attrs


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[85RedCarrera]

You are fortunate- it is far easier and less risky to install the Timesert into a stripped hole than to drill out a broken stud and do it. Be sure to watch the Stomski web site video on how to use the tools ( Install tool and Timesert kit are separate kits)$$$. The kit comes with an assortment of centering discs (uses the exhaust port to center the tool), but none of them fit my 3.2 ports. It is then necessary to wrap something around the disc to make it a snug, centered fit. I used aircraft aluminum tape, and it worked well. The Stomski tool and the Timesert kit is awesome.

[Showdown]

Originally Posted by Showdown

If you need other drill collars for the Stomaki tool (I borrowed on so I don’t know what it comes with) you can get there here from granger. Outer diameter is 1/2”

https://www.grainger.com/category/machining/drilling-holemaking/drill-bushings/headed-press-fit-drill-bushings-h?attrs=Outside+Dia.%7C1%2F2+in&filters=attrs


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Also (and sorry for so many posts, I’m still waking up) you can use the stomski kit to center and hold the timecert tap if you a.) buy a collar from granger that’s the same diameter as the tap, or b.) 3D print a collar. I can send you a file if you want to print one as I made one for my project.


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[yelcab1]

You are lucky. The last time this happened to me, it was on a 72 MFI 911 engine. The hole actually was oblonged and could not be fixed with an insert. We tried to weld it and redrill but the repair would not hold the torque and the welded portion kept pulling out. A single replacement head could not be found. Another set of MFI head had to be enlarged to accommodate the 2.4L engine and the whole set of heads were replaced. It was insane what one exhaust hole damage led to.

Good luck with yours.

[ammonman]

On the 3.0 heads you can use a BigSert if a prior repair failed and the hole is oversize for a standard TimeSert

[ed mayo]

First install a 10 x 1.25 timezert, then a 8 x 1.25 timezert will screw into that.

[mo-mon]

Thank you for all the replies.

[john walker's workshop]

If the stud is just pulling out and the hole is not all wallowed out, I would just use the timesert drill and tap and freehand it, no smart racing tool needed. Just eyeball it straight and the drill will basically follow the hole.

[Magyar Kiwi]

Hi
Suggest using a suitable stepped stud, no messing with timeserts.
Cheers