Nige Posted March 8, 2019 Author Share Posted March 8, 2019 Dunno, I'd be tempted to clean them up best you can and refit the new exhaust to the existing studs. They don't look that bad in your photos. Wanting nice new shiny studs in there could break you mentally and physically. I had to drill 3 out and that was bad enough. I felt the risk of it going t*ts up even with a good quality jig to hand was always on my mind, even more so if I had 12 to do. Link to comment Share on other sites More sharing options...
Busybee Posted March 8, 2019 Share Posted March 8, 2019 12 minutes ago, Nige said: Dunno, I'd be tempted to clean them up best you can and refit the new exhaust to the existing studs. They don't look that bad in your photos. Wanting nice new shiny studs in there could break you mentally and physically. I had to drill 3 out and that was bad enough. I felt the risk of it going t*ts up even with a good quality jig to hand was always on my mind, even more so if I had 12 to do. +1 What he said. I did mine last year. Luckily didn’t have to drill any studs but had to drill out an air injection tube. That was bad enough. They don’t look too bad David. I’d be tempted to leave well alone. Link to comment Share on other sites More sharing options...
Type911 Posted March 8, 2019 Share Posted March 8, 2019 They look fine to me! Link to comment Share on other sites More sharing options...
proporsche Posted March 8, 2019 Share Posted March 8, 2019 (edited) to avoid the problems with studs i do replace the nuts every year... Ivan Edited March 8, 2019 by proporsche Link to comment Share on other sites More sharing options...
MaxDiesel Posted March 8, 2019 Share Posted March 8, 2019 As the others have said those studs look like they'll clean up OK. I wouldn't risk trying to change them unless you have the cylinder heads sat on a workbench - even then its still not easy as the original thread lock doesn't seem to release unless its very very hot... Link to comment Share on other sites More sharing options...
David Gander Posted March 9, 2019 Share Posted March 9, 2019 Thanks for all the advice Chaps, I’ll have another closer look at the studs after a clean-up but at least two are very corroded. Need to mull over this! regards, David. Link to comment Share on other sites More sharing options...
Phill Posted March 9, 2019 Share Posted March 9, 2019 (edited) Put the exhaust on, tighten the nuts and if one snaps then you know you need to replace. It won't make much difference whether it's snapped or not if you have to remove. It's a pig of a job either way and best avoided if possible. As others have suggested, don't do it if you don't have to. Edited March 9, 2019 by Phill Link to comment Share on other sites More sharing options...
Busybee Posted March 9, 2019 Share Posted March 9, 2019 I’d try to avoid if at all possible but if there’s a real dodgy bugger (or three) and it just has to be removed, probably easier to remove before snapping. If you can heat, cool, heat, cool in lots of cycles then double nut them to get them off, it’s a much better option than drilling. If possible. Link to comment Share on other sites More sharing options...
David Gander Posted March 20, 2019 Share Posted March 20, 2019 Have finally grasped the mettle and replaced the broken stud! Bl@@dy nerve racking to drill out using the cut-off old manifold flanges as a guide with stainless thick-walled tubing to reduce the hole diameter as a guide for the drill bit. Still managed to break a drill bit and had to resort to the good old Dremel....... Anyway, now to fit those lovely stainless heat exchangers courtesy of our Matt at Type911. More photo’s posted as things hopefully progress! Have heeded warnings about going for total stud replacement and on the experience of replacing only one stud, I’m going to see how the remaining studs torque up.....if ok they can remain in-situ......if disaster strikes we’ll just have to repeat the tedious process again! I think that realistically the complete stud replacement could only be carried out during a major engine rebuild where the heads could be uniformly heated in an oven, the studs frozen and then hopefully extracted. David. Link to comment Share on other sites More sharing options...
Dr Rock Posted March 21, 2019 Share Posted March 21, 2019 Link to comment Share on other sites More sharing options...
David Gander Posted March 21, 2019 Share Posted March 21, 2019 Thanks Doc. Regards, D. Link to comment Share on other sites More sharing options...
David Gander Posted March 28, 2019 Share Posted March 28, 2019 Success!!!.......exhaust now installed and car started this evening! Not the easiest job to do but got there in the end. Not had a chance to check for leaks as the idle is now 200 rpm and obviously stalls. Could be the timing as I had to move the distributor when accessing one of the tin-work bolts, will check tomorrow. Hopefully off SORN in the next few days and the open road ahead!......well......not withstanding all the bl@@dy road works which seem to have proliferated these past few weeks. Anyway, just wanted to share a modest success. Link to comment Share on other sites More sharing options...
Sidewaysfun Posted March 29, 2019 Share Posted March 29, 2019 Congrats David, I've got 3 studs to do on mine. Planning to do in May some time I think. Link to comment Share on other sites More sharing options...
David Gander Posted March 30, 2019 Share Posted March 30, 2019 Courage my son! Only advice I can give is be very careful and methodical. Should you come to grief, swallow hard and think very carefully what course of action needs to be done to rectify. I tried heat / cooling cycle and Rost- off to try and free the effing different metals to no avail. Drilling out the broken stud was nerve racking but ok in the end. There is advice on here from those who have undergone this trial by fire, but if you need to talk, just pm me and I’ll give you my mobile number. A friendly shoulder to lean on helps! Regarfs, David. Link to comment Share on other sites More sharing options...
Henry Posted March 31, 2019 Share Posted March 31, 2019 Very well done , all looks lovely under there now . Link to comment Share on other sites More sharing options...
David Gander Posted April 1, 2019 Share Posted April 1, 2019 Thanks Henry, bit of a journey this one but got there in the end. My sand-blasting cabinet came into it’s own with refurbishing the intermediate pipe and waste-gate plus waste-gate silencer......finished off with high temperature paint. Just need to finish off refitting the rear bumper and lights, then road test......yippee!!! Fingers crossed that all is well.......? regards, David Link to comment Share on other sites More sharing options...
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