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Join Date: Dec 2001
Posts: 9,569
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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.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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02-28-2011, 07:34 AM
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Timesert is what I used. Very simple and easy to use. top notch result.
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83 SC Targa -- 3.2SS, GT2-108 Dougherty Cams, 9.5:1 JE Pistons, Supertec Studs, PMO ITB's, MS2 EFI, SSI's, Recurved Dizzy, MSD, Backdated Dansk Sport Stainless 2 in 1 out, Elephant Polybronze, Turbo Tie Rods, Bilstein HD's, Hollow 21-27 TBs, Optima Redtop 34R, Griffiths-ZIMS AC, Seine Shifter, Elephant Racing Oil Cooling. |
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02-28-2011, 07:36 AM
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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
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Bob Hutson |
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02-28-2011, 08:16 AM
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abit off center
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Step it indeed!
These are made out of old steel head studs. 
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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02-28-2011, 08:58 AM
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Registered
Join Date: Nov 2010
Location: SoCal
Posts: 759
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Quote:
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. 
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Jon B. Vista, CA |
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02-28-2011, 01:18 PM
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Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,503
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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  
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03-01-2011, 03:48 PM
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Almost Banned Once
Join Date: Feb 2009
Location: Adelaide South Australia
Posts: 38,396
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Quote:
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.
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- Peter Last edited by sc_rufctr; 03-02-2011 at 01:16 AM.. |
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03-02-2011, 01:14 AM
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Harley
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
