How To Fixed Stripped Out Threads
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Date: 2020-08-05
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Comments and reviews: 10
The
Eric, Love your videos. I do all my own work cuz I don't trust anyone to fix my vehicles. (and your too far away to visit ) However, I have extensive experience with Heli-Coils and just want to let you know you should NEVER use Loctite on Helicoils. The reason being is if you have to remove the bolt in a week/month/year the coil will Usually come out with the bolt. It appears you used Purple which is the low strength formula so you might get away with it.
The reason the coils go in with resistance is they are wound oversize to the bore/thread and shrink/compress as you wind them in. You correctly wound them in past the end ( one turn is usually good ) which allows the sharp edge on the outside end of the coil to bite into the parent metal. This and the friction of the coil trying to expand in the hole keeps them securely in the hole. Not a criticism, just have years of experience with these things.
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Eric, Love your videos. I do all my own work cuz I don't trust anyone to fix my vehicles. (and your too far away to visit ) However, I have extensive experience with Heli-Coils and just want to let you know you should NEVER use Loctite on Helicoils. The reason being is if you have to remove the bolt in a week/month/year the coil will Usually come out with the bolt. It appears you used Purple which is the low strength formula so you might get away with it.
The reason the coils go in with resistance is they are wound oversize to the bore/thread and shrink/compress as you wind them in. You correctly wound them in past the end ( one turn is usually good ) which allows the sharp edge on the outside end of the coil to bite into the parent metal. This and the friction of the coil trying to expand in the hole keeps them securely in the hole. Not a criticism, just have years of experience with these things.
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Brad
Heli-coil leaves the repair stronger than original, particularly when used in aluminum. The threads gripping the base metal are now of larger diameter which can handle more pressure than the previous sized threads. In addition, there is a large amount of friction induced into the threads during the final tightening which is now imposed on the insert rather than the base metal. As far as the to thread lock or not to thread lock topic I know from experience that you should NOT thread lock them into place unless using a solid threaded insert such as a time-cert.
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Heli-coil leaves the repair stronger than original, particularly when used in aluminum. The threads gripping the base metal are now of larger diameter which can handle more pressure than the previous sized threads. In addition, there is a large amount of friction induced into the threads during the final tightening which is now imposed on the insert rather than the base metal. As far as the to thread lock or not to thread lock topic I know from experience that you should NOT thread lock them into place unless using a solid threaded insert such as a time-cert.
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Andy
By FAR The best Helicoil video Ive seen, and Ive watched quite a few.
Im about to do the same on 2 Subaru Oil pump holes. Whats confusing to me is that M6x1mm is not the same as 6mm x 1mm. I first got an IRWIN brand 6mm x 1mm thread repair kit and it was Smaller than the original stripped hole. Just got the Helicoil M6x1mm and it seems to be the Right size, but it did Not come with a drill bit. Wondering if M6 is an SAE measurement?
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By FAR The best Helicoil video Ive seen, and Ive watched quite a few.
Im about to do the same on 2 Subaru Oil pump holes. Whats confusing to me is that M6x1mm is not the same as 6mm x 1mm. I first got an IRWIN brand 6mm x 1mm thread repair kit and it was Smaller than the original stripped hole. Just got the Helicoil M6x1mm and it seems to be the Right size, but it did Not come with a drill bit. Wondering if M6 is an SAE measurement?
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Phillip
I've got steel stud bolts on the head for the exhaust manifold to go on that broke off in an aluminum engine. I used cobalt and solid carbide drill bits to drill them out, and it did nothing but harden the steel more. Even a solid steel extractor broke off in there. What the heck do I do now? Too dang heavy now to take it to the shop. i need an on-site solution. Got any suggestions? Excellent videos dude!
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I've got steel stud bolts on the head for the exhaust manifold to go on that broke off in an aluminum engine. I used cobalt and solid carbide drill bits to drill them out, and it did nothing but harden the steel more. Even a solid steel extractor broke off in there. What the heck do I do now? Too dang heavy now to take it to the shop. i need an on-site solution. Got any suggestions? Excellent videos dude!
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William
Dude. don't keep drilling and tapping until you hit bottom. Your Helicoil is not that long. Only go in as far as the Coil can go, and ALWAY cut off the tang. Maybe you can get lucky and use two Helicoils to make it go down all the way, but you would likely be better off going in the length of the HC and hope for the best with the rest of the treads if needed.
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Dude. don't keep drilling and tapping until you hit bottom. Your Helicoil is not that long. Only go in as far as the Coil can go, and ALWAY cut off the tang. Maybe you can get lucky and use two Helicoils to make it go down all the way, but you would likely be better off going in the length of the HC and hope for the best with the rest of the treads if needed.
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Mattterson34
You are very correct i feel the same way. In my I have always pulled the head on a Subaru in the car. Ive seen ppl pull the whole engine and just like baffles me all that waste time when all u need to do is have the right sockets to reach the corner bolts and it comes right out. Lol
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You are very correct i feel the same way. In my I have always pulled the head on a Subaru in the car. Ive seen ppl pull the whole engine and just like baffles me all that waste time when all u need to do is have the right sockets to reach the corner bolts and it comes right out. Lol
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FedUpin
It almost seems like to error on the side of caution, that you would use the Loctite on the heli coil instead of the bolt but what do I know, I've never done this type of fix. Good job as always. We always learn from you.
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It almost seems like to error on the side of caution, that you would use the Loctite on the heli coil instead of the bolt but what do I know, I've never done this type of fix. Good job as always. We always learn from you.
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Malcolm
I always preferred the Camloc by Alcoa Thread Repair Insert, M8 x 1. 25, Drill Size 9. 5mm as they have separate locking wedges & don't come out with the bolts. As have had with the standard helicoils.
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I always preferred the Camloc by Alcoa Thread Repair Insert, M8 x 1. 25, Drill Size 9. 5mm as they have separate locking wedges & don't come out with the bolts. As have had with the standard helicoils.
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Gene
I've got the same model & year Outback (white too, bought new, and found same exact problem when changing PS pump. tks for the tutorial! disappointing Subaru hasn't stepped up, esp ref head gaskets
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I've got the same model & year Outback (white too, bought new, and found same exact problem when changing PS pump. tks for the tutorial! disappointing Subaru hasn't stepped up, esp ref head gaskets
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Martin
It's not that you are behind in your work, its more like the best mechanic in the neighborhood is just capturing all the customers. If you are good at you do, work finds it way to you.
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It's not that you are behind in your work, its more like the best mechanic in the neighborhood is just capturing all the customers. If you are good at you do, work finds it way to you.
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