Welding Cylinder Heads - Team Camaro Tech
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post #1 of 12 (permalink) Old Apr 8th, 08, 11:14 AM Thread Starter
 
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Welding Cylinder Heads

Hey gang,

I have a fairly rare casting that is not holding pressure. It is leaking in an apparent weld or repair in one of the combustion chambers.

Is this something I can have welded easily? What do I need to know to have a local shop weld it up for me, and what should this cost?

thanks
Joel
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post #2 of 12 (permalink) Old Apr 8th, 08, 12:01 PM
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Re: Welding Cylinder Heads

This is a tough one. Welding cast iron is definitely for an Industrial Shop - more likely a Foundry or one with a Furnace. The whole cylinder head has to be heated cherry red for weld repair to fuse properly and you will have to re-machine about every aspect of the casting due to warping during the process. Any other way is very chancy as you do not want failure that will drop debre into a cylinder.

If anyone else has had success with this one I too would like to hear it.

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post #3 of 12 (permalink) Old Apr 8th, 08, 02:09 PM
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Re: Welding Cylinder Heads

As above the heads should be bolted to a plate to prevent ditortion during weld
Special rods are used for the welding and the heads are cooled slowly in a furnice/oven

The crackes have to be opened up with a grinder etc

I worked for a while in a engining shop that did this sort of stuff and metal spraying etc
Was shown and did many cast and aluminuim items
At home have successfully done things like cast exhaust manifolds/ cast pot bellys and stuff like that.. using the gas axe and a mig and bolting to a plate/old head

My Spelling is not incorrect...it is creative

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post #4 of 12 (permalink) Old Apr 8th, 08, 06:02 PM
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Re: Welding Cylinder Heads

My friend (owns a cyl head shop) sends cracked cast iron cylinder heads somewhere back east ,,does good work.
If you are interested I can get this info?

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post #5 of 12 (permalink) Old Apr 8th, 08, 06:48 PM
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Re: Welding Cylinder Heads

I saw a process that was interesting on iron heads basically where they drill into the crack and drive a special small pin into it, then grind the head off the pin flush with the head surface rinse and repeat a whole bunch of times along the entire length of the crack. They could even repair cracks around the seat as well with this method. Was supposed to be superior to welding the head since it wouldn't distort it and just as strong.

If you have it welded it *will* need to be machined again to be straight and true.

Ed

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post #6 of 12 (permalink) Old Apr 8th, 08, 07:01 PM
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Re: Welding Cylinder Heads

My uncle did this work in the 60's & '70's, in Colo IA.

Fifty-five gallon drums cut in half & hinged for the gas-fired oven, two heads per oven.

As Ron said, bake head to cherry red, brazed with nickel rod, let set in oven for another couple hours, then turn off fire and let cool overnight. Pull out and machine the seats, new guides, and resurface just enough to clean the deck.

Most anything cast iron. Always made an oven to fit.
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It is a learned art. Check yellow pages for weld shops doing cast iron repair, they will be the older establishments, sometimes. Tech schools may know of these shops.

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post #7 of 12 (permalink) Old Apr 8th, 08, 07:24 PM
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Re: Welding Cylinder Heads

Had this done many years ago by someone that heated the head but used brass or copper , up behind the valve bowl area. These were old double hump race cast iron head. Basically needed the head to hold water pressure and that it did. Man was from Mexico and did lots of head and block welding. Large equiptment stuff. $50-75 but that was 20-30 years ago.

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post #8 of 12 (permalink) Old Apr 9th, 08, 01:47 PM
 
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Re: Welding Cylinder Heads

Quote:
Originally Posted by BigBlock1969RS View Post
I saw a process that was interesting on iron heads basically where they drill into the crack and drive a special small pin into it, then grind the head off the pin flush with the head surface rinse and repeat a whole bunch of times along the entire length of the crack. They could even repair cracks around the seat as well with this method. Was supposed to be superior to welding the head since it wouldn't distort it and just as strong.

If you have it welded it *will* need to be machined again to be straight and true.
I had a set of heads fixed just this way. I ran a blower and it cut between two cylenders. It was ok for the five years I had the motor. Ran the same blower back on it. The pins worked realy well for me.

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post #9 of 12 (permalink) Old Apr 9th, 08, 02:03 PM Thread Starter
 
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Re: Welding Cylinder Heads

thanks for the replies guys.
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post #10 of 12 (permalink) Old Apr 9th, 08, 02:48 PM
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Re: Welding Cylinder Heads

Quote:
Originally Posted by Travis1 View Post
I had a set of heads fixed just this way. I ran a blower and it cut between two cylenders. It was ok for the five years I had the motor. Ran the same blower back on it. The pins worked realy well for me.

Travis
Called stiching, good process.

Don
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post #11 of 12 (permalink) Old Apr 9th, 08, 04:58 PM
 
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Re: Welding Cylinder Heads

Yes, "stitch-pinning" is the fix.

http://www.locknstitch.com/

Please use the link b/c you can do this yourself if you want to.

And there is a place called The Chapin Welding and Machine Shop or whatever it's name is(??) in Chapin, IL that furnace welds heads and all sorts of cast-iron, or at least the last time I asked anybody from central IL to verify if they were still in business and I think they are.

Back like about '68, I stood by the guy that was furnace welding a big diesel head as he did the repair!

Like standing next to "the Door to Hell!"

WAY cool how this is done by me..

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post #12 of 12 (permalink) Old Apr 9th, 08, 06:08 PM
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Re: Welding Cylinder Heads

http://www.muggyweld.com/castiron.html


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