Warning about JB weld

[WJM]

Just dont use it were there's heat.

 

I attempted to JB weld a bung onto the intake manifold in order to use the GM coolant temp sensor for the MS-II...

 

I even let it set DRY and overnight...

 

Didnt hold. Popped off as soon as the system got pressure.

 

Oh well, time to start drilling/tapping.

[SakoTGrimes]

Other things to not use JB Weld on: radiator to hose connections and plastic fan blades:dead:

[Snowman]

I would wonder if it wasn't mixed thoroughly enough or if it was the wrong ratio or something...perhaps the mating surfaces were not clean enough (very common problem)...JB should hold well in cooling system temperatures. I used it to patch the crankcase on my outboard five years ago and it's still holding strong. At work, we had to temporarily patch an exhaust manifold so we tried JB weld on it. Even at those temperatures, it would hold for a few trips before simply burning away.

[ZRX Doug]

It's not really designed to hold pressurized liquids in a "slap it on like a band-aid" fashion, though it'll work pretty good (usually) if it's formed so that there's a bit of a mechanical bond instead of merely an adhesive one..likewise, it doesn't expand/contract at the same rate as aluminum, so it's apt to fall off eventually if a system experiences extreme temp cycles.

[zyewdall]

There's different types of JB weld too

 

http://jbweld.net/products/index.php

[WJM]

Well, I drilled and tapped...so heres the fix when done...but still metal everywhere.

 

[WoodsWagon]

For the future, if you coat the drill and tap with heavy grease, you can do your work without leaving chipps everywhere, and worse, inside the hole. I do this when puting inserts in stripped spark plug holes.