rounded off arp's

[kabanimk3supra]

The "professional Mechanic" rounded off one of my headbolts.

I have tried hammering a slightly smaller socket on with no luck.

Is there some kind of socket I can use to get it out without having to drill it out?

keep in mind these are 12 point bolts

I think 1j was talking about it a while back but I cannot find the thread it is in.

thanks

 

[nsngarage]

They make sockets that have what looks like a swirled star on it, but it's sort of reverse threaded.. um... I think they're called bolt grip extractors or something?

 

[rayall01]

Man, that sucks, go kick him in the nuts, you have my permission.

 

[JDMMA70]

Theres a bolt extractor for bolts and such i dunno if the space is big enough but its about $40 for the set of sockets.

 

[thedave925]

For the record its "IJ." not 1j
That is all

 

[figgie]

wow!

how did he round off a 12 point bolt unless he used the WRONG sized socket!! That is surprising!!

Anyway. CAM needs to come out before attempting one of those bolt extrators.

 

[IJ.]

Good luck getting enough room to use an extractor as their bodies are larger than the counterbore in the head.

If it were me I'd grab a 12.5mm drill (1/2" will work as it's 12.7mm) and drill down into the allenkey socket in the top of the stud till the nuts pops off then replace the stud and nut as both are available from ARP.

 

[rayall01]

Good luck getting enough room to use an extractor as their bodies are larger than the counterbore in the head.

If it were me I'd grab a 12.5mm drill (1/2" will work as it's 12.7mm) and drill down into the allenkey socket in the top of the stud till the nuts pops off then replace the stud and nut as both are available from ARP.

Whoops! Pay attention IJ, he's using ARP bolts, not studs. At least that's what he says.

 

[IJ.]

Same procedure then but start with a 4mm drill as a pilot hole.

 

[briggsy]

he can still drill into it, the head of the bolt will break off the body of the bolt, then remove head and extract the remainder of the bolt

 

[CyFi6]

Put a magnet down in there to catch some of the shavings, the entire heat will likely need to be cleaned thoroughly as well though. The previous owner of my engine did the same thing but on a stud nut and used an extractor. He decided it would be a good idea to grind the head aluminum away so he could fit it in there, and i guarantee you...a disassembly of the bottom end showed the results of letting metal get in there, so be careful.

 

[IJ.]

Grease on the 4mm bit then a big blob of grease around the head while slowly drilling with the 12.5mm bit.

 

[Mk3runner]

I'd try pounding another socket on first. Pics?