Welding advice: Is it worth trying to fix?
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Topic author - Posts: 6451
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Welding advice: Is it worth trying to fix?
Three of the exhaust manifolds I straightened were so far gone that they didn't survive the process. Would it be worthwhile to vee cracks like this and braze them?
The inevitable often happens.
1915 Runabout
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Re: Welding advice: Is it worth trying to fix?
Steve I have plenty of warped maifolds you can have. I used to straighten them but found that I was spending too much time and using more welding gas than it was worth. The repro manifolds are fairly cheap and work great. Other than for the exercise, I would not bother.
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Re: Welding advice: Is it worth trying to fix?
I agree with Russ, even straight ones aren't worth much more than $25...
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Re: Welding advice: Is it worth trying to fix?
If it wasnt a fairly rare or one of a kind manifold I think I would forget it. The repos are pretty decent and will last as long as you own a T. This is one repo T part that’s pretty good I think.
Re: Welding advice: Is it worth trying to fix?
I also agree with the others in just replace it however if you are a fix it guy like so many of us are I would use a spray bar to repair cast iron rather than braising it.
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Topic author - Posts: 6451
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Re: Welding advice: Is it worth trying to fix?
I believe the only problem with the reproduction manifolds is that they're all 26-27 style. If you're trying to be "correct" for other years you have to find a good original or fix one that's slightly bent. It's sort of like the 26-27 gas tank problem, but the other way around.
The inevitable often happens.
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Re: Welding advice: Is it worth trying to fix?
If i had the resources, i would try to fix it, because i'm strange. That and obvious location problems.
If you do fix it, show us out of curiosity.
If you do fix it, show us out of curiosity.
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Re: Welding advice: Is it worth trying to fix?
Steve, The heat from brazing the crack would likely pull the manifold the wrong direction, and you would be back where you started.Darryl
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Re: Welding advice: Is it worth trying to fix?
Daryl raises a good point. I think it would only work if you can make whatever weld you decide on with the manifold and glands bolted to a decent jig, to keep everything in line.
Allan from down under.
Allan from down under.
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Re: Welding advice: Is it worth trying to fix?
I have seen exhaust manifolds brazed, and work fine. However, generally, model T manifolds can get a bit too hot for brass. A nickel bronze braze might be a bit better. Still, exhaust manifolds are better done either by actual cast iron welding, or the metal spray mentioned by Scottio (at least I think that is what he is referring to?). I have never done that myself, however I watched a demonstration up close of it being done and was quite impressed by it. I had hoped to get the supplies, but couldn't afford to, although the basic kit isn't (wasn't?) very expensive.
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Re: Welding advice: Is it worth trying to fix?
If you really wanted to attempt it, couldn't you stick it onto an old block, and work on it there? It CANT move out of line that way.... ??
Greg Scholz
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Re: Welding advice: Is it worth trying to fix?
Steve,
The replacement manifold 3060B is for everything 13-25 and 26-27 when not vaporizer.
I know, you can fix or repair anything with ingenuity but new ones that fit great, look great, and have really good counterbores are less than 100 bucks delivered.
The price is the same as it was 25 years ago when I bought one when an old timer told me to not heat for nut removal, cut the pipe off, give it to him and he could walk it off with a drift and a hammer in his vice. I got back a bucket that looked like one of those chocolate Easter bunnies that was dropped from about 100 feet! I was disappointed when the old was destroyed, yet really impressed with the new one.
I have bought several since and the threads come in full. Work a nut on and off while on the bench before trying it in a car
The replacement manifold 3060B is for everything 13-25 and 26-27 when not vaporizer.
I know, you can fix or repair anything with ingenuity but new ones that fit great, look great, and have really good counterbores are less than 100 bucks delivered.
The price is the same as it was 25 years ago when I bought one when an old timer told me to not heat for nut removal, cut the pipe off, give it to him and he could walk it off with a drift and a hammer in his vice. I got back a bucket that looked like one of those chocolate Easter bunnies that was dropped from about 100 feet! I was disappointed when the old was destroyed, yet really impressed with the new one.
I have bought several since and the threads come in full. Work a nut on and off while on the bench before trying it in a car
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Re: Welding advice: Is it worth trying to fix?
Steve, it may be worthwhile in other ways than money. Weld or braze, not sure which (I've never personally brazed before). I am curious how far the non-visible crack goes and might even break it the rest of the way before repairing.
Vern (Vieux Carre)
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Re: Welding advice: Is it worth trying to fix?
Have never done any brazing, but I made some braised short ribs in the Crockpot last week that were really good!
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Re: Welding advice: Is it worth trying to fix?
In the '60's was hard to find a repro manifold.. had one like that cracked, in the same place, and took it to a shop for welding.
Came back with a big cast iron weld all the way around, about 1/2" wide and 1/4" tall. Looked odd, but no leak there. But was out of alignment, so used the flat asbestos gaskets back then, seemed to work out.
Today, I would just order a new one!
Have carried good used, nice threads, with fairly real straight ports, even had a straight edge on the swap meet table to show. Couldn't sell them for my asking, finally after 3-4 swaps, got them gone for $10 each
Came back with a big cast iron weld all the way around, about 1/2" wide and 1/4" tall. Looked odd, but no leak there. But was out of alignment, so used the flat asbestos gaskets back then, seemed to work out.
Today, I would just order a new one!
Have carried good used, nice threads, with fairly real straight ports, even had a straight edge on the swap meet table to show. Couldn't sell them for my asking, finally after 3-4 swaps, got them gone for $10 each
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
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Re: Welding advice: Is it worth trying to fix?
Pardon my mis-reading of this title; "Wedding advice: Is it worth trying to fix?" I was hoping for help.
My cataract surgery and anesthesia today may be to blame.
Please excuse the interruption.
Rich
My cataract surgery and anesthesia today may be to blame.
Please excuse the interruption.
Rich
When did I do that?
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Re: Welding advice: Is it worth trying to fix?
Brazing won't work well on a exhaust manifold. An exhaust manifold can get red hot with the spark retarded.
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Re: Welding advice: Is it worth trying to fix?
I've welded a half inch diameter hole in an exhaust manifold with cast iron rod. The best rod I found is an original Model T piston ring. It is some nice cast iron! The hardest think to find is cast iron flux (the flux I use is red). I had found flux on the Internet but could find anything local. Straighten it when you are done if it needs it. That repaired manifold has been on the car for about five years now.