Ferrino Posted July 2, 2004 Share Posted July 2, 2004 Are there any tips for undoing nuts on rusted bolts? I am referring to the exhaust manifold studs, whose threads have become corroded and look like they are going to pose a problem when trying to untighten the nylocs attaching the manifold the the ali cylinder head. The nylocs themselves look like they have rusted to the bolt thread a bit too! Cheers! Link to comment Share on other sites More sharing options...
DanB Posted July 2, 2004 Share Posted July 2, 2004 Heat them up with a blowtorch and then cover liberally with Plusgas or some similar joint-loosening spray. Leave them for a day and then attack them. If they're still stiff, repeat until successful... p.s. nylocs on a manifold? That must be pretty sturdy nylon in them bolts... 😳 Link to comment Share on other sites More sharing options...
Gambo Posted July 2, 2004 Share Posted July 2, 2004 I find liberable use of wd 40 helps on rusted bolts. did not know ni-locs could withstand exhaust temperatures though, I thought the nilon bit would just melt Link to comment Share on other sites More sharing options...
Sheds Moderator Posted July 2, 2004 Share Posted July 2, 2004 Heat as above is the answer, multiple cycles if you like, and copious Plusgas when cool. Replace with brass nuts for no repetition, and if the studs are shot do them too. Go easy into the ally though. If you don't heat the nuts then you will snap the studs and it gets ugly. Link to comment Share on other sites More sharing options...
Alba 7 Posted July 2, 2004 Share Posted July 2, 2004 My order of attack is..... 1. Douse with penetrating fluid (I use Plus Gas and it seems to work) and leave, go back and put on more and then the next day give it a try (not a lot of use if it is an emergency I know 😬) 2. Next step up, is to try heating the nut with a blow lamp (may be impractical if there are combustible components close by). This often does the trick though. 3. A really long (breaker bar) used with a socket rather than the normal ratchet can often shift things that appear to be stuck. 4. Remove the nut either with a nut splitter or dremel or hacksaw. Last resort as it often damages the thread of the bolt / stud but if it was this corroded it needed replacing anyway. Link to comment Share on other sites More sharing options...
pete east Posted July 2, 2004 Share Posted July 2, 2004 WD40 does work but you have to give it time, About a day or so before you start work on the car give the offending bolts a good dose of WD. I have found that bolts that just wouldnt budge on the first attemp come apart with ease if you give the Wd time to do its stuff. Link to comment Share on other sites More sharing options...
Ferrino Posted July 2, 2004 Author Share Posted July 2, 2004 Thanks for all the tips guys! Didn't mean nylocs - doh! Link to comment Share on other sites More sharing options...
elie boone Posted July 2, 2004 Share Posted July 2, 2004 What also works when the whole tread is rusted is undo the nut 1/2 turn then go back 1/4 turn undo 1/2 turn go back 1/4 turn until you feel it goes easy'er to undo the nut. Link to comment Share on other sites More sharing options...
puremalt Posted July 2, 2004 Share Posted July 2, 2004 tap them with a hammer first.Never fails Link to comment Share on other sites More sharing options...
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