adhesive that will withstand water heat?

[skyline084]

I purchased the ebay intake manifold for my rb25. For some stupid reason, they didn't weld the port where the upper radiator hose attaches to the manifold. I tried using high temp gasket sealer, with j b weld and neither of them work. J B weld holds up for a few days, than the water some how seeps through. J B weld says it can withstand up to 500 degrees, but i guess not with water against it.
So what have you all done to prevent this piece from not leaking??

[skyline084]

anybody?

[rioredstang]

I haven't seen one of these manifolds but You will need to remove the manifold and have it welded. The manifold expands and contracts as the engine gets hot then cools down. The expanison rates of the jb weld and the alum are not the same causing it to crack after several heat cycles.

[CanuckQx4]

JB weld when properly mixed and cured can take coolant no problem

Ive used it TWICE to repair holes in blocks from stupid customers grinding to much of there block webbing to clear turbo housings. Both held up fine supporting there cooling systems afterwards with no seepage.

Gives it something to bite to rough up the surface a bit and mix the portions properly

[float_6969]

I'm pretty sure that piece isn't welded on anyway, but an epoxy is used. If done properly, the JB weld should work. I used JB weld to fix a cracked coolant temp sender on my CA and had it like that for years w/o any problems. Make sure the surfaces have been roughed up with some sandpaper, and clean them really well. I personally like acetone to clean anything that I'm epoxying together. It seems to prep the surfaces really well and I've never had any bonding issues. I use epoxy A LOT to fix things and as long as it's properly prepped, and allowed to cure for long enough, you won't have a problem.

[skyline084]

na rioredstang is right. Since the pieces are seperate, the expansion makes the seal crack every time. So stupid, I don't understand why they couldn't have welded this, would have taken two seconds.

[float_6969]

Isn't the part falling out made of steel? If so, you can't weld steel to aluminum. You can't eve braze them. Maybe solder them, but I doubt it. Epoxy is your only option. Nissan does it that way from the factory as well.