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Join Date: Dec 2005
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Removing Exhaust from Turbo: How to Remove Nuts?
'86 930 stock turbo and exhaust. I'm replacing the exhaust and wondering if I should pre-condition the nuts on the turbo studs. Should I apply liquid wrench? Heat? Both? Tap on the wrench with a hammer or just torque them loose?
TIA, Spoke ![]()
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I used an entire bottle of MAP gas to get mine free. Heat and patience.
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Thanks. Kinda what I thought. Did you just torque on the nut after heating?
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Red heat on the nut, then not much torque required. once moving, don't stop, keep it moving.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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I recently removed a B&B and wastegate from my '82. It reminded me of that meme "Broken bolt - only 1 second away from a two day job". The most difficult stud on the turbo/exhaust flange had been cross threaded, and the nuts were rounded. Slow process.
Start with the proper wrench(es), heat as recommended, and don't rush it. New studs will be stainless and nuts will be copper or titanium. |
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I put headers on recently. I sprayed the fasteners with Kroil twice a day for a week. Overkill? Yes, but all 12 came off without a problem.
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SR 86 930 x: 62 356, 64 356, 76 930, 84 911 Targa, 85 ROW 911, 00 996, 07 Cayman S, 00 M5, 02 G500, 66 Shelby GT350 (x2), 64 Corvette. |
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Like Alan said, get the nuts cherry red. Heat is your friend here.
The first time I did this job I made the mistake of not using heat. I broke 9 of the 12 studs. Not fun.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Nothing worked on mine. Like pkabush all but 3 broke
I installed Time-Serts and new studs in all of them with the Stomski kit. Mine were from 1979 and had 83K on them. So yours may be stronger. If you get them out I would try to replace all the studs. I wouldn't trust retorquing them.
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Well, unless you have a torch hanging around the garage, you might try spraying them all a couple of times a day for two or three days with something made for that job to break them. I've done this quite a few times and they have always come off easy.
Geez, my 1,000th post! ![]() Last edited by icemann427; 03-04-2022 at 09:14 AM.. |
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https://www.amazon.com/Jet-Lube-Anti-Seize-Lubricant-Conductive-Termination/dp/B009VO2O1Y when you reassemble
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan '14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button! |
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Quote:
Some other advice I had been given on the exhaust was using the copper coated/covered nuts. https://www.amazon.com/gp/product/B01EI3EB7W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
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I use stainless nuts on these studs. Work great.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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CRC makes a great product called "Freeze-Off" The idea is to spray the heck out of the bolt/stud to get it to shrink a bit and be able to crack it free.
https://www.pelicanparts.com/More_Info/05002M633.htm?pn=05002-M633&bt=Y&fs=0&SVSVSI=812 For reassembly you should check out Wurth CU800. It's a copper anti-seize that's been around FOREVER and is rated for use up to just about 2200F. https://www.pelicanparts.com/More_Info/WRTH08938001.htm?pn=WRTH-08938001&bt=Y&fs=0&SVSVSI=812 |
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Quote:
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan '14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button! |
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I used Titanium studs with Titanium nuts on the outer studs and stainless barrel nuts on the inner studs
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1989 930.66 G50 Convertible - Grand Prix White, K27 7200, Fabspeed Long Neck Intercooler, Microsquirt eWUR & Bosch AIV (AAV retiral), Tial F46P 1.0 Bar, Air Pump delete, Fabspeed twin pipe exhaust previous Porsche's - 2008 997 Carrera S4, 1988 928 S4, 1983 931 |
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The nuts would be copper coated not solid copper since copper would be too soft.
I've been using ARP studs and they've worked well without galling.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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Thanks for all the comments. Really appreciate the ideas. Many have mentioned copper-coated nuts or titanium nuts. Where can I find these nuts? I didn't see them here on PP.
Also for removing the nuts and assuming I will replace them, along with penetrating oils, what if I used a Dremel tool to cut off the nuts? Perhaps it would be less stress on the studs? I used the Dremel to remove the rear bearing races on this car. After struggling for hours with a bearing splitter and heat, I decided to use the Dremel and 5 minutes later the races were off.
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My first call would always be heat. If that failed, yes, a cut with a dremel would be an option, then heat again - rather than try and totally cut them free. you may have trouble getting a full cut along the nut, but even half way down may work with some heat if the heat alone won't.
Are you replacing the studs? If so, dremel is a useful option. Much easier if the heat works first tho. Stainless nuts work fine. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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I took this to mean removing the catalyst/muffler from the turbo itself. All of the above heat suggestions, plus a set of curved and stub box wrenches. You also have to take down the rear bumper, which is pretty easy. The turbo studs are A286 high temperature stainless steel, and the nuts are copper plated steel. All are available from Pelican.
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Yes - must confess - was thinking exhaust nuts. But same process on turbo.
If you have enough space for the dremel, and they won't budge directly with heat, you can cut a groove. You can go to the point of JUST seeing the thread line in the groove. That is usually enough to relieve tension and with some heat, should work. And the stud should still be intact if needed again. You don't have to run the groove all the way down the nut if not enough access, but more is better. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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