heli-coil failed, now what?
Thread Starter
Joined: Dec 2004
Posts: 699
Likes: 1
From: Redondo Beach, California
heli-coil failed, now what? So I thought that fixed that rocker bolt thread but when I started the car up the bolt came off again, after i took it off and saw that the heli threads were stripped out and they were on the bolt leaving the new threaded holes stripped put. what do I do next? get a larger heli-coil? It also stripped another rocker and it broke the rocker mounting tray.
Whats causing the threads to continuously strip out? I dont think you can put a helicoil in a helicoil. Maybe you can find another type of threaded insert thats a little bigger than the helicoil, but it may be time for a new head.
There is something called a Keensert that might fix it. First, why are they stripping out. A heli-coil will not strip out if properly installed as it is stronger than the original threaded hole. I think you have some bigger issues here. What is the setup?
Keensert
Keensert
Last edited by vettenuts; Dec 26, 2005 at 04:47 PM.
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Originally Posted by SELLSZ06
frist it was the shop that over torqued them, now it just didnt hold up. would a bigger bolt fit the stock rocker?
Thread Starter
Joined: Dec 2004
Posts: 699
Likes: 1
From: Redondo Beach, California
LAPD in calif. I have patriots heads w/ ls6 cam, stock pushrods and rockers and a gt42. Iam puzzled, I rally dont want to take the head off to fix butit looks like I have no choice.
you should be able to just take the old heli coil out and then put a new one in. you could always take it to napa and they should have someone that can do that kind of stuff. but you arent going to be able to go bigger because the bolt won't be able to fit through the rocker.
thread repair You can not repair that with another helicoil if the hole is stripped. You don't want to try and weld it either. You will make a mess of the head.
E-Z Lock available through mscdirect.com on the internet.
8 mm x 1.25 pitch insert part number is: 99762346
They make a stainless insert as well. I don't recommend stainless steel for this application.
The outside thread on that insert is 1/2 - 13. That should be more than large enough to fix the stripped hole. You will also need the installation tool: 86767381
Cost for both is under $20.
It would be best to remove the head and do this on a Bridgeport or cylinder head machine. If you are very careful about drilling and tapping the hole straight, it can be done in place.
Steve
E-Z Lock available through mscdirect.com on the internet.
8 mm x 1.25 pitch insert part number is: 99762346
They make a stainless insert as well. I don't recommend stainless steel for this application.
The outside thread on that insert is 1/2 - 13. That should be more than large enough to fix the stripped hole. You will also need the installation tool: 86767381
Cost for both is under $20.
It would be best to remove the head and do this on a Bridgeport or cylinder head machine. If you are very careful about drilling and tapping the hole straight, it can be done in place.
Steve
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Do exactly what Ferocity02 said...take it to a mechanic or machine shop, have them weld/tap it. Good as new. This would be cake for them. Don't f around with 'goofy' fixes, do it right. No big deal.
Thread Starter
Joined: Dec 2004
Posts: 699
Likes: 1
From: Redondo Beach, California
you guys are right, can avoid doing it right, the good news is that Gunnar from Patriot said the fix it for free, good cust. service. bad news is it will be 3 weeks, so since I havent driven my car going on 10 months Ill try a local shop first.
I have ARP studs, I dont have to take them off right? I should be able to lift the head from them and slide over right? Its a Camaro.
I have ARP studs, I dont have to take them off right? I should be able to lift the head from them and slide over right? Its a Camaro.
Thread Starter
Joined: Dec 2004
Posts: 699
Likes: 1
From: Redondo Beach, California
Originally Posted by Gunnar@Patriot
John,
Have you shipped these in to us yet?
Have you shipped these in to us yet?
