Argh, stuck bolt on starter! Any suggestions?

[MarkW]

One of those "when it rains it pours" moments.

2002 F150 w/ 4.2 and 5 speed. The clutch slave cylinder went out completely but was able to get it the 70 miles back home. The slave is integral with the throwout bearing so I have to pull the trans, all was going well until I try to remove the upper starter bolt, which must be a special order whitworth or something because 13mm and 1/2" are both too big for this particular bolt, and 12mm & 7/16 are too small.....

Has anyone had this situation before? I've tried using a chisel to turn the bolt, it cuts into it OK but I haven't been able to get a good angle enough to turn it. I'm at the point where I am thinking about drilling a hole in the side of an old socket and MIG it on there but prolly do that tomorrow since how my luck has been going today I'd set it on fire or something!

Anyway, I'm posting this here in the chance that someone has dealt with this before and I'm overlooking an easier solution.

Thanks for reading!



MW

[MarkW]

OK, I was able to break it free with an air chisel.

I need to get a new bolt tomorrow too.