Stuck fast, rounded nuts!
Not on my Audi but a friends Vectra C i'm working on. Vauxhall has used copper nuts on stainless steel thread for the Exhaust manifold.
Out of the 10 nuts, 5 have come off no problem. 2 have stuck to the short thread rod and undone that...so still not an issue.
BUT 3 are stuck fast and one has rounded off badly, two are rounded a little. They are 10mm nuts so I've tried heating them with a blow torch (which helped with 3 of the others), they all had plenty of doses of WD40 over the week running up to the removal.
Apart from acetylene gas, has anyone used any tools/special sockets for removing rounded nuts? The copper is really soft on these nuts and access for a junior hacksaw is a no go.
If you have any other suggestions or ideas please let me hear them. My friend, doesn't want to pay a local garage to fit the replacement Manicat.