Seized manifold bolts

[rustprooflandyracer]

Any advice on removing a seized exhaust pipe manifold nut from the studs? Typically two out of the three came off and the last is stuck fast! I have been soaking them with WD40 for two days now and nothing!! I'm running out of ideas... :shock:

[mattyme]

the only way forward is to use oxy aceteline and heat the nut up till its glowing red all the way round then whip a socket on it straight away and it will come off easily. you will need heat on it tho to get it off without shearing the stud.
then as your studs will have rusted, youll need stud extractors to remove the studs, again using oxy aceteline around the housing for the studs.
new studs will screw in to the existing holes just by using your fingers.

in short, without oxy aceteline youre gonna keep on struggling till a stud shears.... then youll have another problem on your hands getting sheared studs out and the difficulty will be 10 fold!!

hope this helps.

[barmiebrumie]

Had one like that on a disco not long ago & managed to get it just hot enough with a plumers blow torch but did have it on the nut for about 10 mins


John

[crazymac]

Remember the WD40 is not that good for loosening things like this!

You are much better off with a product like "Plusgas" or some other propriety product.

[clbarclay]

Another trick that can help undo siezed nuts and bolts is to try tightening them a bit first to crack the corosion bond. You could also try splitting the nut, though that can be easier said than done.

As above WD40 is not a great penetrating fluid and heat is very effective.

[oilburningcossack]

I know this sounds daft but I find that welding a bigger nut on first then remove both the stud and nut in one. I.E. the heat from the welding lossens the stud and a bigger new nut allows a better grip.

[Range Rover Blues]

Use a nut splitter toremove the nut then clean up the thread with a die.

Alternativley have youtried starting the engine and removing the stud with the manifold hot?