Current state of the art for stud repair- timeserts, and which nuts?
 

Making some progress on the 901/05 this weekend

Went to tighten the heat exchangers down, one exhaust stud pulled out!

Very frustrating as I had multiple others replaced when the heads were done. Should have replaced them ALL.

What is current state of the art? Helicoil, Time-Sert, Other fix? There is a nice clean hole in the affected cylinder, so installing something should be pretty easy.

Also, what are you all using for nuts these days? I was using copper lock nuts, 12mm ATF on the studs that don't take a barrel nut. When my new studs were installed, many of them have a 25mm installed height, which doesn't work with thin flange heat exchangers-- has to be 20mm or the stud will push the hex driver right out of the barrel nut before clamp load is applied!

I wonder, has anyone gone beyond this? 12-point jetnuts? I am using SSI exhaust so clearance is an issue.

Timesert is what I used. Very simple and easy to use. top notch result.

There is another solution....you can use stepped studs (10mm into head..8mm sticking out)
I have replaced all my studs with stainless...and will use copper nuts when reassembled (with anti-seize of course).
Bob

Step it indeed!

These are made out of old steel head studs.

http://i30.photobucket.com/albums/c3...1/100_7069.jpg

At Swift we used Rosans and Keenserts to reinforce alloy housings. We tested several brands and found Keenserts the strongest. They're keyed after installing, with a staking tool. Photo below is a damaged Indycar transmission housing, with Keensert to support the rear wing. They're available in standard metric sizes.

For an exhaust stud in aluminum alloy, any of the standard thread repairs will probably be fine, with at least 12mm depth for an 8mm stud.

http://forums.pelicanparts.com/uploa...1298929584.jpg

I keep a full set of these for what might be needed. Theyre very convenient, probably should look for places to use them more than I do.

Bruce

http://forums.pelicanparts.com/uploa...1299026808.jpg
http://forums.pelicanparts.com/uploa...1299026881.jpg

Craig and Bob

These look nice but this solution worries me. What if these pulled as well? :(

I like the spring type inserts as mentioned in this thread. You remove the absolute minimum of material getting them in and if they become damaged they can be removed easily.
I've been using them for longer than I care to remember and I've never hand an issue.