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Re: rounded-off lug nuts
The auto parts stores cary a special kit for removing these wear eye protection and if you have air tools it will make it much easier. don't use sockets not rated for air tools (they break and will hurt you)
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You may be farther ahead just putting a new hub assembly on it. If you'd rather not, once you get the rim off you can smack them a few good times with a hammer and knock the stripped ones out the back side and install new ones in reverse order.
Forget removing tire from its current position. Taking it off without the right tools is next to impossible and ............
Bang the lug nuts with a nice lump hammer to loosen up any corrosion. Then try heating the nuts with a torch, and with a good pair of vise grips and and an extension for them loosen the nuts to remove the rim.
I have an 04 xj8. the lug nuts are a good bad example of half baked engineering. the lug nuts are fabricated from ugly steel with an 11/16 hex end. to beautify this, Jaguar overlays the nut end with a stainless steel 3/4 inch cap, crimped to the nut. On top of this, the nut is to be torqued to 90+ ft-lb! The only way to remove the lug nut without damage is with a SIX POINT socket and a breaker bar or an impact wrench. Using a 12 point socket will deform the cap, causing the wrench to spin on the cap and or the cap to spin on the nut itself. If that has happened, it is possible to recover using a 15 oz or thereabouts ball peen hammer and a deep 3/4 inch impact socket (the black ones). Line up the socket to the cap, doing a best guess to where the flats are and give the socket a light blow. Keep trying that until the socket seems to stick on, then hit it harder. Eventually you will find the right point and the socket will go on and reform the cap. Then a breaker bar can remove the cap/nut. New assemblies can be had for about $6 from "partsbin" or "autohausaz".
Here's another thought - if the stud isn't too badly stripped, you may be able to use a re-threading die to restore the threads. The thread type and size will depned on the make and model of your car. An autmotive parts store can usually help with this.
If you must replace the stud,
A bad stud can usually be driven out through the back of the axle flange. You said the stud was stripped. You can:
Force one of the lug nuts onto the stripped stud maybe two to three turns , then take a drift pin and drive the stud out the back. The stud will have grooves that hold it in place on the axle flange. You willl hhave to hold the stud head with vice grips and remove the lug nut to get the stud out.
To install a new stud, insert it from the back, add a little grease to the knurls (grooves) and pull it into place with a lug nut. The stud must be firmly seated in the axle flange.
If you have a socket you are willing to destroy, Find a socket that is as close to the size of the lug nut, but not bigger. Whack it on with a hammer, use a socket wrench (with enough leverage) to remove the lug. Locking nut: Find a socket that is about the same size as the lock nut, follow steps above. **This only works with the star shaped lock nuts and the ones that "key" goes into.