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Tractor Talk Discussion Forum

Cast iron repair

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Tennessee Red I

03-04-2007 16:56:52




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I have an engine block that has been welded on the side. They did a nice job and with a little grinding I can get the shape right. How do you guys finsh or paint the cast iron to make it look like cast iron and not a smooth spot. Hopefully one of you will have a trick!! Thanks




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strawbale

03-04-2007 22:39:35




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
I use a needle scaler or a airhammer/chisel with a blunt point to achieve a cast look. i have never had a problem, but i try to do it whan the weld is still warm as you are suppose to peen the weld anyway. just my 2cents



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CalJim

03-04-2007 20:39:56




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
Primer. First coat, throw some fine dirt on it
while tacky. Second coat. Repeat if necessary.



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Larry806

03-04-2007 18:58:02




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
Use a thick primer and when it is " setting up " take a whire brush and bounce it around on it . Don't worry about getting it to rough you can send it a little after it dry's . Even knowing where it is at you'll have a hard time finding it . i have even done it to JB weld over the weld as a extra measure of caution .



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NE IA Dave

03-04-2007 18:55:33




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
If you give it a coat of heavy primer in just that general area and throw a handfull of sand on to it always works well. Then put your final coat over the sand. The trick is to feather it in a random over spray pattern, a little less sand as you get farther out away from ground zero. No one will ever know unless you tell them.



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Tom in Central Pa

03-04-2007 18:05:07




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
I "roughed up" a smooth spot, after a repair, by using a center punch and small hammer. I kept the punch moving all around the area, while sriking it lightly with the hammer. Doing this until the texture matched the surrounding area.



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mike a. tenn.

03-04-2007 18:14:42




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 Re: Cast iron repair in reply to Tom in Central Pa, 03-04-2007 18:05:07  
if i was doing that i'd put the emphasis on the word "lightly". you're braver than i would be. if i had a repaired crack in something as brittle as cast, i'd just be too afraid of causing more damage. cast that's been heated and repaired can have extra stress in it and i've seen cast crack with not much of a whack. i think i'd go with the other guys post and try and match the texture with the primer or a body filler by "dabbing" at it.

just my 2 cents,
-mike

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Steven@AZ

03-04-2007 17:53:25




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
If the weld is holding, don't stress it with grinding... just my personal experience with welding cast iron.



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mike a. tenn.

03-04-2007 17:15:04




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
TRI...watch oout grinding that weld. i'd leave it alone if i was you, it may very well be a built up weld and you could go thru it.

which part of the state are you from red?

-mike



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Bob - MI

03-04-2007 17:04:52




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 Re: Cast iron repair in reply to Tennessee Red Iron, 03-04-2007 16:56:52  
You can dab paint on with a sponge. It will leave a stippled surface that you can over coat and it should blend in ok.

I would be careful about dressing the weld too much. Depending on how the weldor prepped the joint you could grind through the weld.



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