Jb Weld on aluminum intake

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Slantsix64

Slantsix64

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Jb weld says that its gas resistant but have you guys used it inside of an intake I got a small hole?
 
any chance you can tap it and put a set scew in it instead?
(plenty of locktite of course)
 
Why not?? As long as surface is clean and oil free, should not have a problem; a drop of water on your finger tip should let you blend edges nice and smooth.
 
Good stuff

15568288090714236398017537811423.jpg
 
You want to make sure you provide a very rough surface for the material to lock into. Up to and including using a small drill bit to crater the surface at different angles. If you just lay the epoxy on top of a crack, it will likely pop off and go into the head due to the different expansion rates of the intake and glue. Give it a good surface to hang on to and it will be there for a long time.
 
I've never known JB Weld to be impervious to gasoline. That's news to me. I used it for a short time on the main jet walls on Thermoquad bodies. It does not hold up to gasoline. I don't care what the label says.
 
I have heard of machinists using some kind of epoxy compound for reshaping ports — don't know if it was specifically JB Weld. But there has to be something that works.
 
Disclaimer: I weld aluminum for a living, there are a hundred guys that use JB weld all over the place quite successfully. I would simply not use it as I have been "rewelding" JB weld repairs for about thirty years. Cheap repairs on aluminum aren't good and good repairs on aluminum aren't cheap. Not trying to start a turd storm here just explaining my point of view after trying to repair countless epic JB weld fails over the years. What typically I could weld in a few minutes had they just brought it in turns into a lengthy struggle as the JB weld does in fact bind to the material and depending on thickness is a real bugger to clean up to the point of actually welding. Think canoes and chainsaw parts here. A manifold may have enough thickness you could grind a pocket and be successful? I just would not. My apologies this got long winded.
 
AJ/FormS said:
and I for one; wouldn't want it going thru my engine if it come loose; that stuff is harder than a rock after it hardens.
Click to expand...

It gets soft when it's hot, but not soft enough to save your engine if it were to find it's way in. There are some very good epoxies that will stand up to just about anything, but they are not cheap and you aren't going to find them at Home Depot. JB weld is good but doesn't solve all problems.
 
Splashzone epoxy is one of the better epoxies out there for this job but is probably overkill. I have a Victor340 intake that I was porting for myself and went through on one of the runners. It is an easy repair from outside and if I was better welding aluminum I would weld it but I'm not so it will get either some Splashzone or JBWeld from the outside of the runner. Here is a post on some epoxy testing I did for myself years ago.


https://board.moparts.org/ubbthread...-epoxy-test-coated-and-un-coated-results.html
 
Get a new intake.
If this is an aluminum intake for a slant, they suck anyways. To porous. Sometimes you got to bite the bullet, and do what's right. Or see if you could get it welded. If you think you have a problem now, wait until the jb weld gets sucked into the motor.
 
How about a coat of POR-15? that stuff hardens to a Rockwell rating! Welders, any luck with Muggy weld rods? At the shows they are always welding up AL cans and radiators, but I have yet to see them do something big like an intake. Im guessing you need lots of heat and thick AL takes alot to heat up?
 
i actually used jb weld on a gas tank lasted 5 years until i sold the car, this is on a 318 intake eddy lb4d, its on the outside next to the vaccum port tap, screw it i just did it. hole was the size of an ant. Let it dry for a week.
 
Slantsix64 said:
i actually used jb weld on a gas tank lasted 5 years until i sold the car, this is on a 318 intake eddy lb4d, its on the outside next to the vaccum port tap, screw it i just did it. hole was the size of an ant. Let it dry for a week.
Click to expand...

J-B weld will work in an intake, if done as suggested above , it wont be under gasoline all the time like in a carb.
Moroso 2 part epoxy is made for repairing intakes and such. I`ve used a few times in intake runners , and in an alum. head successfully , but does need something to adhere to also...…….
 
I used an epoxy putty to fix a cracked lawnmower crankcase.
It lasted many years of hard use.
Having it welded would be the best.
My local welding shop is owned by my good friend, little welds like that dont cost me a thing.
I tried the crankcase repair, due to having to rip engine completely apart and all the oil. It was a test. A very successful one.
 
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