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YOUR RESEARCHExtract exhaust bolt: weld nut or drill? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Install helicoils
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but I have drilled out several broken bolts and installed helicoils.
Extract exhaust bolt: weld nut or drill? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Install helicoils' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install helicoils' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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I installed stainless steel studs with bronze nuts so the next time it will be a breeze.
Extract exhaust bolt: weld nut or drill? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use obviously was not getting things hot enough
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Suggestion · Original poster
The “MAP” gas I’ve been using obviously was not getting things hot enough to break the bond between rusty stud and head.
Extract exhaust bolt: weld nut or drill? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use of care, time, penetrating fluid, heat, etc, i managed
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Suggestion · Original poster
Despite liberal use of care, time, penetrating fluid, heat, etc, I managed to break off 4 of the bolts.
Extract exhaust bolt: weld nut or drill? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Hi guys,
Removed my exhaust manifolds from my 2000 986 2.7. Despite liberal use of care, time, penetrating fluid, heat, etc, I managed to break off 4 of the bolts. All are sticking out 3-5mm from the surface.
My question is, should I try the weld on nut technique first, or go straight to drill-out with a jig/kit?
I’d like to try the welding method, as there’s a chance of getting 1 or 2 out with little time spent, but I am worried about warping the head or something. Can I do this with a stick welder, or would MIG or gasless MIG be less risky?
I’m of course planning to take it easy - attach the nut, let it cool, build up some more weld in the nut, cool, etc. But, the whole point is you get at least some good heat in the stud/head, else it won’t work. The “MAP” gas I’ve been using obviously was not getting things hot enough to break the bond between rusty stud and head.
if there are 3-5 mm of thread that should be enough to screw a nut on ... a couple threads.. if that is the case i would DEFINITELY weld. The heat alone from welding the nut on would help too ... i drill as a last resort . cant speak to stick vs TIG , it depends what you have on hand i guess
Thanks! Yeah, they are pretty rusty, but there’s enough thread left to even screw a nut on a little bit to keep it in place.
Still worried about welding just being too hot and there being a danger of warping the head. Hoping to hear that this is not a big risk if I take it easy from someone that has been through this with an M96 engine. Have you, Iceman?
I have found quite a lot on the net of people drilling out with jigs on M96, but not much about the weld method. Wondering why.
I can't help with the idea of welding... but I have drilled out several broken bolts and installed helicoils. With a good bit it goes pretty quickly. I didn't use a jig so some of my holes were a little off but no big problem. I installed stainless steel studs with bronze nuts so the next time it will be a breeze.
Arc-welding shouldn't transfer that much heat to the head if you just weld one tack at a time. You can get a spot-weld with decent penetration and cause no damage, as long as you let it cool down between welds. Don't go all the way around in one go, and you'll be fine.
Higher amperage should work better, as the faster you melt them, the less heat will pass through to the head.
not on an M96 engine. but given the heat an exhaust manifold puts out . i wouldn't hesitate to do it , but i get it, everyone's risk tolerance is different.
good advice above.
You ever sort this? I had 6 of 12 broken on a new to me engine. I tried welding, but the bolt just kept snapping below the welded nut, and had to buy the pricey jig to drill it out. I think the welding effectively heat treated it. Tungsten carbide bits were the key.
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