96 Vtec-Cracked Exhaust Manifold
Can it be welded? or is that futile?
When I took the heat shield off in the engine bay,you can see the crack on the manifold,its about 2 inches long or so.Im not sure what type of metal was used,but if it can be welded closed,I have a friend that can do it. It is not causing a problem now but would like to fix it if I can,or replace it if a weld is a waste of time. What say you Honda folks? :) |
The exhaust manifold is cast iron.
I had a crack in my exhaust manifold and just bought a new one. You can probably find a used one at a junkyard for pretty cheap. I didn't have the option to weld it, so you can give it a shot to see if it holds. I just wonder if the difference in thermal expansion of the weld vs the iron will cause it to crack again. |
Originally Posted by PAhonda
(Post 197771)
The exhaust manifold is cast iron.
I had a crack in my exhaust manifold and just bought a new one. You can probably find a used one at a junkyard for pretty cheap. I didn't have the option to weld it, so you can give it a shot to see if it holds. I just wonder if the difference in thermal expansion of the weld vs the iron will cause it to crack again. I do plan to replace this,but if it was possible to weld it,and it would hold,I would do that first for no cost. Thanks for the info. :) |
Well a salvage yard replacement is probably the easiest/ cheapest way to go.
FWIW, the old Yota 20R engines were bad about cracking exhaust manifolds. Welding is no good, Brazing is the answer. I used a rosebud tip to heat up the entire manifold and then the area around the crack to a dull red. Then brazing tip, and fill in the crack. The braze expands and contracts at a closer rate as the cast iron and it won't crack again. Been there, done that, seen the movie, and got the T-shirt. :D |
I would listen to hondadude.
Welding cast iron takes an great deal of skill. Not many people can do it properly. You might as well give it a whirl anyway though haha. If you are going to have to replace the thing anyway...what do you have to lose? |
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