does JB Weld “really” fix aluminum threads
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- Опубликовано: 2 июл 2020
- I’ve heard a lot of people talk about fixing aluminum threads with JB Weld. I’ve got the perfect application, so will put it to the test. This application has no heat on it, it has a torque spec of about 18 foot pounds.
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You should completely fill the hole, let it cure and then re-tap it. Putting an oily bolt in there will only serve to prevent the JB Weld from curing properly.
Why would oil stop it from curing? The polymerization occurs independent of the environment.
That's exactly what I thought
@@josephoo7oil has very good cohesive properties meaning it likes to stick to itself very well, this ends up with a layer of fluid on the bolt that would take up space where the new threads should be making the actual threads weaker. If you fill the hole entirely and tap it your thread fitment will be much tighter and less likely to slip. I saw a video where the guy threads and taps JB weld in an aluminum block and he was putting a face load on the head of the bolt that took over 2000lbs of force before the threads failed, it was a 1/4" thread
Good to know, thank you for this!!
Excellent video and guidance. Many thanks to you. 🌺🌺🌺
thanks for the tips
im curious as to how malleable jb weld is well after its curing period; the product is marketed as being very resistant and holding high amounts of tension but wouldnt it be counter productive to 'cut' into it with a bolt's threads? kind of like carving wood.
nice vid, thx!
JB Weld says that it's threadable/tappable. I've never done it, but I would fill the hole a bit more (maybe even all the way), then hit it with a thread tapper. Also, he's using Marine JB Weld, which may not be as strong as the original.
You'd get a lock nut behind that mount.
Exactly what I was looking for. Thanks.
How did it work
@@htatesil4192 it does not
@@chriscs9080 yepp I just got inserts way better
You should try some helical inserts they work very well !
Thanks, I saw a lot of people re-creating threads like this but I never actually saw them put torque on them. At least now I know.
@@livefree6878 I used JB weld with Heli-coils to get my seadoo head bolt some proper threads, downside is it destroys the threads on the bolt, Im going to try tapping the JB weld tomorrow with actual bolt threads to see if it makes it to 17 Ft-lbs, Im using JB Marine Weld with a tensile strength of 5050 PSI, and the threads are 1.25 inches long. I have reason to believe if the JB weld is Drilled and tapped with threads correctly then left to sit a bit longer it becomes alot stronger, but Im going to test this theory. Putting a bolt in the hole and using a release agent ive heard causes uneven weak points as it cures, it also can slightly damage the threads, also mixing it like a cake adds air, gathering it up and spreading it out also causes weak spots. Will reply back if it breaks.
@@cameraman1234567890how’d it go? Doing this on my dirtbike
The ATF fluid messed up the strength of the jb weld. No mold release needed if once it cures you back out the bolt. I have used this on valve covers 6.5ft lbs and head bolts 20ft lbs.
You talking about threads for cylinder head bolts that hold it the block?
@@Mohapi_Tau yes, i have have to use JB weld on the block to the head as well as valve cover to head an never had a problem torquing the bolts out after letting the JB weld setup. Using release oils only degrades the tensile strength of JB weld.
@@dmcd7333 Ok so won't the JB break when the bolt is hardened on to it and you back out the bolt?
@@Mohapi_Tau I have not had that problem with quality steel automotive bolts....but be careful with aluminum bolts they shear much easier. Pam anti stick spray that you use for cooking you spray on your finger and lightly apply to aluminum bolts...this will not degrade jb weld like an actual oil will. Good luck.
If you use anything as a release agent with epoxy it should be wax. A candle or a crayon rubbed on the threads would work fine.
congratulations nice work, but where did you put the screw in a jar of oil? if so and not to stick to the glue jb weld ?
Typically I put oil on A cloth and rub it into the screw, too much oil to make a mess. It’s not the strongest thread, But in some applications it works.
Since the threads are partially damaged/stripped, how about re-creating the threads to the next larger size and using a larger bolt as a permanent solution?
Sounds like a great idea, I’m not really liking the idea of putting a Heli coil in there. Thanks for the suggestion. That’s probably the directional we will go👍👍
@@livefree6878 heli coils are junk unless Thay can bottom out on the threads .should use the next size bolt up and just cut new threads or sins it went all the way threw u could have just used a nut in the other side and thru bolted it
At first I thought you were saying helicoils are junk 😂. But your right, they need to be bottomed out unless it's a very low torque and small bolt.
@@michaelh7527 why what happens? You drill and tap the hole to fit the helicoil so it sits in its own set of threads and the coil matches the thread pitch. So how would a blind hole be better than one that passes all the way through? The insert isn’t supposed to bottom out in a blind hole to begin with whether you use a bottom tap or a plug tap. Even with a bottom tap, good threads don’t go all the way to the bottom of the hole because you can never drill a blind hole out to the very bottom for retapping. The fastener never bottoms out in a blind hole either you’re just asking to crack the material.
These electronic footmeter is awesome. Where can I buy it and can I use it for newton meter?
Pittsburgh is Harbor Freight brand
You should try out the HI heat JB weld stick putty
I'm using it rn as he did I hope it works I don't need but like 11lbs
What about adding some steel wool shavings to the JB Weld?
Steel wool would not work too well, it's too fine to let the epoxy fully saturate it. I think something more like a stainless steel dish scrubber would be stronger and let you mix in the epoxy better.
JB Weld specifically says DO NOT USE ALCOHOL. Your issue is residue.
or they mean dont drink alcohol while using the product.
i would hate to wake up in the morning to a sloppy drunken mess and jb weld everywhere it shouldn't be.
ipa dries with no residue. if you got residue its contaminated.
@@darkshadowsx5949 Not true. IPA leaves a residue. Otherwise you could soak an O2 sensor in it.
@@urgentcareguy3 what residue is that though? Because isopropyl alcohol isn’t anything but that and distilled water I believe to dilute. Denatured alcohol is ethanol with I believe methanol to make it undrinkable. All alcohol is miscible with water so it’ll absorb moisture from the atmosphere and dilute itself eventually but does that really mean the residue is water?
91% isopropyl alcohol works fine as a solvent wipe for paint prep on metal so 🤷🏽♂️
L
@@dirtyaznstyle4156 I would contact JB.
Where did you buy your brush for the bolt hole? I can find no brush that small.
Gun shop or from any gun cleaning kit of the right caliber.
@@waynemizer4912 yeah just be careful not to load a bullet into the hole thinking its your revolver.
How about filling the hole up and then retyping it to that size
i dont thing " retyping it" is going to fix the hole unless he spelled hole wrong somehow.
@@darkshadowsx5949 im sure he/she meant 'retapping'
I’ve tried completely filling the whole and drilling/taping, didn’t work, just crumbled up, it’s not good for this type of application.
The only good succesful use of jb weld i had was to fix a a small hole in fuel tank. Wenever the part is subject to a stress you can be sure jb weld will fail
Depends .. of you use it for low torque bolts it should work fine.
This is what happens when people get even a bit careless with impact drivers.
With aluminum you can succesfully tork two or three times then it will fail at the rated torque on subsiquent torquing. Found this out the hard way on a timing belt replacement on an older car I owned and maintained from new.
Yes jb weld it will hold the bolt in place maybe.. lol.. but in /out all time, sceptical...
It's not possible coz' epoxy is still plastic but aggragates that are hard should be added to the epoxy (shredded carbon fiber will strengthen it to aluminum strength). 50/50 ratio.
God bless.
What do you think JB weld is?
JB weld has steel in it already. If you add shit too it it will just make it weaker
@@buttadog5073 JB Weld via email said for more strength add fiber glass (the smaller the better) but I add carbon fiber strands instead (cutting it myself as small as possible) but it shouldn't be more than 10% of the fiber glass said the JB Weld representative who emailed me back (I guess the strands are like bigger aggregates on top of the small small metal in JB Weld original). Thanks. I tried it, tested a sample, it is tougher with the fiber glass and carbon fiber.
Though the regular viscosity carbon fiber and fiber glass epoxy is a bit harder than JB Weld I tested at least when you scrape it off the surface or break the small sample into (little explosion for both there's not in between, but the carbon fiber/fiber glass epoxy's took more force on its own- by a bit, not significant).
Use it dry man. I use JD weild to fix the threads on the pressure plate bolt when I did my clutch. I broke off the bolt originally. Had to wait and was freaking out. I drove on a imbalanced pressure plate spiking my blood pressure shifting into 4th gear cause of the vibration. I waited for the bolts to come in from o online. I tried to drill the old bolt out I got it out but only in pieces 🤣 but the thread were damn near gone. A little be was left. I put JB weld around the new bolts and threading it into the hole THANK GOD my pressure plate balanced and it drove and shifted smooth 😎 that jb weld is literally holding til this day
wont the jb break when you back out the bolt if it is in dry?
@@Mohapi_Tau no, you wait for it to cure partially then back out the bolt
To this day I can till you cause I haven't had to change the clutch again its still good
My booger bushing in my shifter cable to gear shifter knob on a different car broke
The original booger bushings thinned out and started to rip
I used permatex black oil resistance , to stick in back together JD weld to cap it and keep it in place and then Flex Seal to make everything Stick together, flexible , and solidify.
@@brandonlogan2600 any videos available?
I would have filled the whole, drilled into it and the re tread! Oil and JB. Do not work together! All the clean you did went out the window the moment you used oil!
So it's better to use dry?
@@walletphonekeys YEs, JB Weld needs to be use dry and in a very clean surface
Use wax
@@joses208 what's that
@@joses208 what kind of wax... From where?
i would have just thrown the jb weld in the trash and drilled the hole out and tig welded an aluminum sleeve in it and tapped it.
i tried jb weld fixes before and they always break later. the stuff doesn't hold pressure very well.
where would you get an aluminium sleeve for a bolt from?
The transmission fluid used completely fucked the JB weld...
Fill hole. Drill out. Tap hole. Torque down.
Save your ass in a pinch. Not really that best way though.
Drill out and sleeve with metal and then tap the new metal would be proper. Or fill with weld and drill and tap.
The amount of money spent on tools to tap and effort spent on this is simply not worth in this particular case.
Ya gotta be kidding! Common sense
its weak 3000psi shear 500 tensile at best at 70°f
Get a Helicoil insert kit !
Lol to hold on a belt tensioner pulley? One of three bolts? Like it’ll ever see 100 psi
@@dirtyaznstyle4156 you have to understand why a bolt is torqued. 18lb/ft wasn't acceptable. He got almost 5lb/ft and started getting plastic creep. Add heat from engine and it will really lose strength. A typical easier repair is a heli coil
You failed the process from the GetGo
Are you even serious? You clean the hole with alcohol and then contaminate it with transmission fluid? Seriously? LOL!! Why on earth would anyone do something like this???
Lol? Because the bolt needed to be lubricated so you can get it off the jb weld. If he didnt use any lubricant, the jb weld would just come off with the bolt. U ignoramus fool, dont laugh at people when you dont even know how to use half the tools hes using
Tbh the hole wasn’t contaminated with transmission fluid. The hole was cleaned with alcohol, dunno if that’s recommended with jb
Weld but it’s better than nothing. Higher percentage than 70% and a fresh bottle at the very least but I’m thinking acetone or xylene cuts oil better. He put the jb weld in the hole first though so none of that transmission fluid coating the bolt should have come in contact with the hole. The layer of jb weld was probably too thin to not be thoroughly contaminated and transmission. Fluid mixed into it.
I can see it working if the depth of jb weld was more than a screw thread or two. Mostly fill the hole, let it start to set up and then screw the bolt in but then it’s a structural repair 😂
Answer: No. JB Weld never works for what you need. I don't know how they can legally sell it, but I guess there's a sucker born every minute.
Lol ur so slow. Jb weld is gasket maker. Almost all car makers use it as a gasket instead of an actual gasket. Front timing covers,oil pans, some even valve covers, a bunch of stuff. And it holds well. Dont be ignorant cause it didnt work for whatever dumb idea you had
@@adamdistortion8810 The fact that you have resorted to name calling and insult attempts proves I am right.
@@dave1283 u disprove yourself with that logic. Ignorance i swear. I wouldnt have commented if you werent such a "sucker"
@@adamdistortion8810 The fact that you have resorted to name calling and insult attempts proves I am right.