Just stripped the threads on a rocker arm bolt...
07-25-2008, 07:45 PM
#4
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being dumb. i thought i had what sounded like a loose lifter after a friday and proceeded to break a rocker arm bolt off into the head on the exhaust of #2 removing the rocker, had that broken stud removed then went to put it all back together, and stripped the intake rocker threads.
oh and is Heli-coil self straight forward or is there some sort of write up etc to do this? sorry for the noob questions, but its been a long week and i thought i was gonna have this up and running tonight.
oh and is Heli-coil self straight forward or is there some sort of write up etc to do this? sorry for the noob questions, but its been a long week and i thought i was gonna have this up and running tonight.
07-25-2008, 09:20 PM
#5
Basically in the kit you should get a tap and the heli-coil and the insertion tool. You drill the hole to the correct size for the tap (it is not the final thread size but rather the thread for the OD of the hel-coil). Then you tap the hole and then screw in the heli-coil by the little tab. Once in place, you break off the tab and remove it. Should be instructions with the kit. Autozone carries them. Just take it slow, and if you have never done it before practice on something else first.
07-26-2008, 06:30 AM
#6
Just exactly as Vettnuts stated. I have two extra things to offer. When drilling the stripped stud hole for the heli-coil tap, you might consider starting with the smallest drill bit that will barely fit into the damaged hole...and then move up in drill bit size increments until you reach the desired size. This will aid you in drilling a perfectly straight hole rather than cocking the drill bit a bit to the side ( I assume you will be doing this with the head still on the car. If not, use a drill press). Secondly, I stacked two helicoils right on top of one another to give me more threads in this critical area. I had to cut the second one a bit short as not to stick proud of the rocker boss deck. They are designed to stack. Good luck!
07-26-2008, 06:53 AM
#7
Just exactly as Vettnuts stated. I have two extra things to offer. When drilling the stripped stud hole for the heli-coil tap, you might consider starting with the smallest drill bit that will barely fit into the damaged hole...and then move up in drill bit size increments until you reach the desired size. This will aid you in drilling a perfectly straight hole rather than cocking the drill bit a bit to the side ( I assume you will be doing this with the head still on the car. If not, use a drill press). Secondly, I stacked two helicoils right on top of one another to give me more threads in this critical area. I had to cut the second one a bit short as not to stick proud of the rocker boss deck. They are designed to stack. Good luck!
Try it first on something else, even a piece of wood if you have to just so you understand what needs to be done as you only get one shot at it, if you have questions post them up. Good luck, hope it comes out OK.
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07-26-2008, 08:47 AM
#8
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8 mm Helicoil inserts come in 8, 12 and 16mm lengths. Use one of the correct length. I'd buy them from McMaster-Carr online.
Here's a link:
http://www.mcmaster.com/
Type in Helicoil and click on "view catalog pages (5)"
Start on page 3200 and find the parts on page 3202.
I would also practice drilling, tapping and installing an insert or two on a scrap piece of aluminum. A bushing to guide the drill would be of a great help. If you know someone with a lathe, a piece of round steel about 1 inch in diameter and about 1-1/2 inch long with a hole thru it the size of the Helicoil tap drill will work. The end of the bushing needs to be square with the hole.
If in doubt about your abilities in this area, seek help from a machininst. If you mess up the Helicoil installation the repair will then becomes very costly and requires removing the head.
Don't overtorque those (or any) bolts. Read and obey the torque spec.
Good luck.
Jon
Here's a link:
http://www.mcmaster.com/
Type in Helicoil and click on "view catalog pages (5)"
Start on page 3200 and find the parts on page 3202.
I would also practice drilling, tapping and installing an insert or two on a scrap piece of aluminum. A bushing to guide the drill would be of a great help. If you know someone with a lathe, a piece of round steel about 1 inch in diameter and about 1-1/2 inch long with a hole thru it the size of the Helicoil tap drill will work. The end of the bushing needs to be square with the hole.
If in doubt about your abilities in this area, seek help from a machininst. If you mess up the Helicoil installation the repair will then becomes very costly and requires removing the head.
Don't overtorque those (or any) bolts. Read and obey the torque spec.
Good luck.
Jon
11-23-2011, 05:03 PM
#13
