landrovermanuk Posted April 3 Share Posted April 3 So, I've managed to snap one of the thermostat housing bolts on my 90. It's left enough thread to screw a nut on and weld it on. I have put some wd40 on it and plan to weld the nut on tomorrow, hopefully the wd40, the heat and the nut will be enough to undo it. Any other suggestions before I make things worse?🤣 Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted April 3 Share Posted April 3 Send it to a machine shop while they have something very easy to position to and they will put a drilll right down the center of it, the treads sghould just peal out then. Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted April 3 Share Posted April 3 2 hours ago, landrovermanuk said: So, I've managed to snap one of the thermostat housing bolts on my 90. It's left enough thread to screw a nut on and weld it on. I have put some wd40 on it and plan to weld the nut on tomorrow, hopefully the wd40, the heat and the nut will be enough to undo it. Any other suggestions before I make things worse?🤣 Should be fine, have used this method before with success Regards Stephen Quote Link to comment Share on other sites More sharing options...
Junglie Posted April 4 Share Posted April 4 I've found Plus-Gas better than WD40 but that's maybe for next time. Good luck. My bolts always sheer flush anyway so I never get to try this method... Quote Link to comment Share on other sites More sharing options...
fmmv Posted April 4 Share Posted April 4 Yes I too have found plusgas way better than wd40 for freeing up Needs time to work mind. But seems no longer available in 5l cans. Looking at Bulldog Bdx as a replacement. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 4 Share Posted April 4 Acetone + ATF 50/50 mix seems to be a popular solution in both senses. I think welding is likely to work though. Quote Link to comment Share on other sites More sharing options...
JeffR Posted April 4 Share Posted April 4 Ive had better results welding a washer on on then welding a nut to the washer, much larger weld area 1 Quote Link to comment Share on other sites More sharing options...
landrovermanuk Posted April 4 Author Share Posted April 4 Thanks for the replies. I remember about the acetone and atf, I'll have to raid my darling wife's nail varnish remover.😉 The reason I was going for welding the nut on, was there's probably enough thread to wind it on few turns but being bored I had ago with mole grips, so probably no thread left now.🤣 Somewhere I have some Duckoil, so may give that a go over the weekend if I can find it. I really hope I don't have to resort to a machine shop...😥 Working tomorrow but my son is off so hopefully he will return my mig as he's taken it to his unit.  Anyway once again, thank you. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 4 Share Posted April 4 Sometimes a careful but firm tap on the remains of the bolt with a punch can break the corrosion on the threads, just don't punch it clean out of the housing Quote Link to comment Share on other sites More sharing options...
Ed Poore Posted April 19 Share Posted April 19 Top trick for welding a nut on - put a washer (if you can) between the nut and casting. Really does help the weld not to stick to the casing. I was skeptical but had a bolt break off flush to the casting on my lawnmowers rear axle casing where it wasn't possible to get all but a specialist air collet drill. Took a few goes with the stick turned up to the max but the washer really did help. Nut was red glowing red once done and once cooled wound straight out. Quote Link to comment Share on other sites More sharing options...
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