Was torquing down the head and one of the ARP head studs snapped and broke. Then used a extractor to remove it and the extractor bit now broke off as well....

WTF do i do??

**** !!! i've never heard this one before. Have you tried contacting ARP ? There customer service is excellent.

You must be improperly torquing the studs. Even if you did manage to break a stud at the correct torque, the studs should only be in the block finger tight, so theres no way you could have broken an extractor in the stud.

If the head is still on, pull the head and you should have some stud sticking out of the block to get some vise grips on or something. If its broken flush with the block, you will probably have to drill out the bolt completely straight and not mess up the threads, and go back in and tap the hole out to clean the threads.

Youre not going to be able to drill out hardened steel in an aluminum block without F'ing it all up. If its broken below the deck take it to a machine shop. How much torque were you at when it broke?

the studs themselves get finger tight they dont get 83flbs as well lol

Yeah you had to of been doing something wrong here. Using arp moly lube the studs get torqued down in 3 steps. 25-50-80 final. The studs themselves DO NOT get torqued into the block at all. Just turn them in by hand till they bottom out or use an allen wrench and turn them in till they bottom out.

i'm just wondering how you broke one off. those studs are so strong that it would take a **** ton of pressure to snap one

Bad stud maybe ??? Would you say its a possibility ?

ive had it where fod has gotten it to the threads whille rework had been done i always check the threads before i insert the studs . other wise the debris will make seem like you getting some where whille tighning but you just fighting crap in the threads.

true chasing the threads and blowing them out is a great thing to do


and snapping a stud in half takes more than a man can do im thinking lol

with arp i really doubt it. those bolts are all xrayed - tested before leaving in a box.

i just literally have never seen an arp headbolt or stud ever break in any engine. i'm not sure how many hundreds of ft/lb would even be required to do so but i would bet higher on the block threads stripping than the bolt/stud breaking

pix??????

I saw someone else break one on another forum. Personally I have assembled so many motors and never had this problem. I would have to guess that the stud was either reused too many times or something was done wrong during tightening.

x2....im curious as to how this happened its extremely rare..

Something went wrong here...

arp even stated to tq in 2 steps. tq in 3 steps or more gives inaccurate readings and cause alot of arp bolts to snap. ive seen it happen a couple times before

Well you're doing it all wrong then and I've never seen it happen to anyone who's used them correctly.

Arp states a 3 step torque down process to a final value of 80ft/lbs. I called and spoke with a tech myself when I put my motor together. 25-50-80 is the easiest way to go about it. This is for B series studs. Not sure about D series honestly. Here you go Read #7
http://arpinstructions.com/instructions/208-4303.pdf

well on a diff forum arp tech said 2 steps. im sure it has to do with bolt stretch
and they odnt snap brand new usually after the tenth time they are tq's down

well to sum this up, ya f**ked up.

think about how crazy what you're saying is. if you go 25-50-80 or if you go 35-80, both ways are 80lb. your statement basically is saying a lower torque number than the final will make the bolt snap.

that just sucks to hear OP it isnt going to be fun

+1

at this point it doesnt matter what he did, it already broke.

might have to get that on a drill press and drill it out then timesert/helicoil it to retain the same thread size. good luck man

ide still like to see some pix

ok here try to go to 80lb in 80 steps
the bolts will not be the same if you go straight to 80lb

if you have ever tq down studs then wait a couple hours and re-tq them. usually you can feel them being tightened more.
even honda says once they are tq down. re tq them because they change after that settle down