Replacing the water pump in 95 s320. I got three of the four bolts out but rounded out the bottom front allen bolt. So, I am contemplating how to extract the bolt, its pretty tight in there with the PS pump still attached.

My first thought is to drive an oversized torx or allen bit into the head of the bolt. Maybe paste some jb weld around the bit and bolt.

Second thought would be to remove the PS pump and see if I can get a Sears easy out bolt extractor on the bolt.

Third, would be to get someone to actually weld the allen wrench into the bolt.

Fourth, would be to use a dremmel to slot out the head of the bold and see if I can turn it with an oversized screw driver, or grind off the head of the bold alltogather, remove the water pump and get some vice grips on the shaft of the bolt.

Anyone have any other ideas or suggestions on which of these I should try first?

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jayhawk