Crap!!!! Broken a freakin head bolt!!!!!!
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,282
Likes: 172
From: Lake Wylie, South Carolina
Wade
Burning Brakes
Joined: Apr 2007
Posts: 1,028
Likes: 1
From: SOUTH ELGIN IL
These bolts shouldn't really be yielding but they should be in tension. A failed bolt could just be a fluke (we all want to be 0 defects but no one really is) or a torsional failure but it could be a bad heat of material or, more commonly when heads start popping off, hydrogen embrittlement. There are generally other factors at play with hydrogen embrittlement, like electroplating a material that is over a certain Rc value and not relieving it correctly. Normally we put a sampling for each lot of parts that are susceptible to this failure mode through a 24 hr test before shipping to anyone - especially automotive.
Did you ask the guy if it could be hydrogen embrittlement? I should have mentioned that in my last post. Sorry.
Don't hit the panic button yet, the others probably would have failed as well.
Did you ask the guy if it could be hydrogen embrittlement? I should have mentioned that in my last post. Sorry.
Don't hit the panic button yet, the others probably would have failed as well.
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
Please forgive if this is a repeat post.
Most likely ARP will tell you to contact the vendor. Summit is very good about accepting returns, just tell them what happened, ship the bolts back to them and ask for another set.
Don't mention that your torque wrench was possibly defective.
Most likely ARP will tell you to contact the vendor. Summit is very good about accepting returns, just tell them what happened, ship the bolts back to them and ask for another set.
Don't mention that your torque wrench was possibly defective.
