Boxerworks.com

Looks I'm on a bad luck streak.

The situation: 82 R100 with 48k miles.....pulled head stud, left side, upper front, yeah the common one for stripping.
I know the torque wrench I use clicks at 4 ft-lb lower (actual) than setting ( safe side ). I always 5 step may way up to 25 ft-lb indicated when re-torquing and when I reach 25 it is actually 21 ft-lb.

Retorquing before valve clearance setting and only got torque of 18 ft-lb, when I went for the 25 ft-lb, there were a lot of curse words emanating from my garage.

I dunno- maybe PO started the raod to stripped or maybe there is some validity to the sthread fatigue theor for these studs. Can't see how my 21 ft-lb would have cause a pull-put.

I plan on using BMW's long reach repair coil and I know about keeping swarf where it doesn't belong after teh drill/tap routine. Any additional tips welcomed as I haven't done this repair on a BMW before ( but have done plenty if helicoil jobs ).

I'll start this job as soon as I gather the stuff

Frog has a great pictoral how to on the interweb somewhere.

I found the Frog link in the archives but nothing shows up after activating the link

Send him a PM. I'm sure he still has all the info. It was a very good write up.

As far as tips, just keep in mind how critical it is that the hole be drilled out and tapped perfectly perpendicular to the mating surface.

Major Softie wrote:As far as tips, just keep in mind how critical it is that the hole be drilled out and tapped perfectly perpendicular to the mating surface.

Absolutely.
We don't want a Moto Guzzi, do we.

Thanks for the kind words guys.

I have not been on the forum much these days, as I have been too busy wearing out tires



I am not sure that you want to follow in my footsteps on this repair, as I decided to install case savers in all eight stud holes, rather than just fix the one stripped thread. I never wanted to do it again and plan to put many more miles on this bike.

I am happy to share my experience or answer questions.

The easiest solution would likely be to install the long helicoil or the like. As for debris, I had both cylinders off, so was able to install a vacuum on the back side of the hole (some are blind and some are not).

Here are my photos with some comments:

https://picasaweb.google.com/1030509870 ... directlink



PS-thanks for the PM, it goes to my e-mail and brought me back to answer your question.

Good luck