Some help arp head stud

[5e colin]

Don't helicoil mate not strong attal the thread will rip out  try solid trisert etc , your engineer seems cleules mate make him pay for his mistake

[gorganl2000]

4 hours ago, Faiyaz.123 said:

That' exactly what happened .

Seems like the engineer hit a blunder .But managed to get them in .then into another problem .one of the bolts at 40nm just spins round .which means again the engineer has tapped it to big so advised to tap and install a helicoil. 

are you sure a helicoil will hold that sort of torque/tension??

maybe some of the other technical members here can lend some insight in this matter

i did use a helicoil to sort out an exhaust manifold/head stud a while back with great success, but i'm not sure about using it for headbolts

 

[5e colin]

theres fuck al tension on a wxhaust manifold bolt 

 

head torques down we are talking 100nm ruffly  helicoil wont handle that i ripped a m12 heli out on tracktor 

Edited February 14, 2018 by 5e colin

[Rob H@RCH Engineering]

Helicoil or a threaded insert type repair would hold I recon, I did a bus engine last week with one and there torqued down 30nm, 90°+ 90° + 60° on m12 bolts so I’m pretty sure they will hold if done properly 

[5e colin]

Threaded insert I would agree  

Rob you used fully threaded insert right ???

[Rob H@RCH Engineering]

I’ve used both at work helicoils and the threaded inserts. Depends what we have on the shelf at the time, never had any problems with either really but the thread insert is definitely the favourite