Stripped the threads out of the aluminum rear timing cover.
Replaced with heli coil and grade 10 stud a nut.
It was a pain getting the coil in but the stud fit really tight and doesn't wiggle at all.
What do you think? Will it hold?
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| Author: | flash7210 [ Sun May 24, 2015 11:37 am ] |
| Post subject: | Stripped timing belt tensioner |
Stripped the threads out of the aluminum rear timing cover. Replaced with heli coil and grade 10 stud a nut. It was a pain getting the coil in but the stud fit really tight and doesn't wiggle at all. What do you think? Will it hold?
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| Author: | papaindigo [ Sun May 24, 2015 11:46 am ] |
| Post subject: | Re: Stripped timing belt tensioner |
Should geordi and I have seen several tensioner mounting holes that were helicoiled from the factory. |
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| Author: | flash7210 [ Sun May 24, 2015 12:01 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
Yes it had a factory heli coil that pulled out. I was afraid that too much aluminum got stripped out and that a new heli coil wouldn't stick in there. But with the stud in there it's really tight. |
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| Author: | WWDiesel [ Sun May 24, 2015 12:04 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
Helicoil thread repair coils inserted correctly are actually stronger than the original aluminum threads as the coil is larger and the repair threads set deeper into the metal where they are being placed. The coil is much stronger than the aluminum metal around it!  Been using standard & metric Helicoils for forty years and have always been impressed by their holding ability....in both aluminum and steel... You may want to use a little Loctite 263 (red type) on the threads of the stud on the mounting end; might make it a little bit stronger??? 
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| Author: | olypopper [ Sun May 24, 2015 12:18 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
Any reason you left the tang on the heli coil insert after you installed it? |
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| Author: | flash7210 [ Sun May 24, 2015 12:21 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
olypopper wrote: Any reason you left the tang on the heli coil insert after you installed it? I didn't know what else to do with it. |
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| Author: | thermorex [ Sun May 24, 2015 1:44 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
flash7210 wrote: olypopper wrote: Any reason you left the tang on the heli coil insert after you installed it? I didn't know what else to do with it. I think that tang can be bent till it breaks, should have had some small cuts at the breaking point from the factory and with a needle nose pliers you can bend back and forth till it breaks, at least this is how I remember it, but I am not a fan of helicoil and wwdiesel can probably tell you more exactly how to deal with it... |
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| Author: | geordi [ Sun May 24, 2015 7:10 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
Looks ok to me, but what caused the original helicoil to pull out? How much force were you using? The correct amount is 28ft-lb to hold the tensioner. The AllData book that my idiot mechanic used on my first engine has it as EIGHTY! Way wrong! Part of the reason why I don't go to that mechanic anymore. Sent from my iPad using Tapatalk HD |
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| Author: | Mike92104 [ Sun May 24, 2015 7:19 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
thermorex wrote: flash7210 wrote: olypopper wrote: Any reason you left the tang on the heli coil insert after you installed it? I didn't know what else to do with it. I think that tang can be bent till it breaks, should have had some small cuts at the breaking point from the factory and with a needle nose pliers you can bend back and forth till it breaks, at least this is how I remember it, but I am not a fan of helicoil and wwdiesel can probably tell you more exactly how to deal with it... Use a punch and hammer. Give it one good hit from the stud side, and it should break right off. It's not necessary to break it if it isn't in the way though. |
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| Author: | geordi [ Sun May 24, 2015 7:22 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
There is plenty of space back there, I'd leave that tang alone. It is already built and seems to be OK, and that cover has already been fixed... And cast metals don't like being impacted much. You don't need any more problems with it! Sent from my iPad using Tapatalk HD |
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| Author: | flash7210 [ Sun May 24, 2015 8:26 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
Thanks guys. It's all re assembled and running good. |
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| Author: | senatorjohn [ Mon May 25, 2015 9:07 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
Helicoils usually go in tang end first with a special tool which is also used to break off the tang. Never thought of installing one that way before but since I do not have the special tool, will try that way if I need to use one. John |
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| Author: | geordi [ Mon May 25, 2015 9:14 pm ] |
| Post subject: | Re: Stripped timing belt tensioner |
I've never broken the thing off anytime I've used a helicoil, hasn't been a problem yet. My preference is a solid collar though, I just think those are more secure. |
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| Author: | thermorex [ Tue May 26, 2015 8:08 am ] |
| Post subject: | Re: Stripped timing belt tensioner |
geordi wrote: I've never broken the thing off anytime I've used a helicoil, hasn't been a problem yet. My preference is a solid collar though, I just think those are more secure. Mine too, if you don't go nuts torquing the bolt in the collar, it's just perfect, especially for using it in soft alloys like aluminum. I use timesert btw. |
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| Author: | flash7210 [ Wed May 27, 2015 8:13 am ] |
| Post subject: | Re: Stripped timing belt tensioner |
500 miles on it so far. If something were to break, I think it would have done it by now. |
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| Author: | geordi [ Wed May 27, 2015 10:12 am ] |
| Post subject: | Re: Stripped timing belt tensioner |
Good to know that it also isn't leaking! Keep it going dude! |
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