Jerry Wass wrote:
Philippe Vessaire wrote:
Hello,
I have one exhaust stud which has come out with all helicoil thread.
(pn 402151)

Does anyone know a repair way?

Thanks


go to larger 3/8" repair insert--use 3/8" X 5/16" stud---I think I have
both--Jerry wassbiplane ---at---tds--.--net

You might have enough material to tap a 3/8"X16tpi standard bolt size,
in which case, the 3/8" X 5/16" stud would work by itself.

See how a 5/16" drill fits in the hole----If it's not too loose, you
might try running a 3/8" X 16 tpi tap into it---if the threads produced
look fairly good--go for it!---my 3/8" X 5/16" studs are slightly
oversized on the 3/8" end anyhow..( stud 1.7" overall, 0.6" 3/8" thd on
one end--0.9" 5/16" x24tpi on the other, 0.2" 5/16" smooth in center.)

I only have about 6 of them, but you can have one for a Dollar (U.S.)

If the above doesn't fix it, I have some 3/8" helicoils---drill size
0.386" dia-----tap O.455" max thread dia.

Hope this helps.

Jerry