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Tractor Talk Discussion Forum

cracked head

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howard38

01-07-2005 19:31:02




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I have a 1938 unstyled A with a cracked head, there are two cracks, 1 is on the left valve seat and the other is on the right valve seat both are about an inch to an inch and a half in length. Would it be better to replace to head or should I have the machinist repair the cack. Either of the two will cost around $350 to $550.
Thanks!




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J. Schwiebert

01-08-2005 12:03:31




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 Re: cracked head in reply to howard38, 01-07-2005 19:31:02  
The last thing you want to do is have the head welded unless you have some one that does this as there only business. I have cold crack repaired (pinned) some A & G heads. The G head was my first and it has been on the tractor for about 10 years now. Questions?



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mattd

01-08-2005 11:50:22




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 Re: cracked head in reply to howard38, 01-07-2005 19:31:02  
if either one costs bout the same then i would replace the head. if you had the machinist weld it, it may crack again beside the weld because the metal is weak from the heat from welding. i wouldnt take the chance, i'd but a new or used one.

matt



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hjp

01-08-2005 20:52:23




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 Re: cracked head in reply to mattd, 01-08-2005 11:50:22  
THERE IS A NEWER PROCESS TO WELD CRACKS IN IRON
"SPRAY WELDING" ITS A PROCESS THAT USES POWDERED IRON IN A "PLASMA" CONCEPT
MY FATHER HAD A OLD LINCOLN FLATHEAD BLOCK REPAIRED THIS WAY ITS ACTUALLY STONGER THAN THE BASE MATERIAL AND IT WAS REASONABLE
I WILL CALL HIM FOR THE EXACT NAME OF IT



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george md

01-08-2005 22:15:49




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 Re: cracked head in reply to hjp, 01-08-2005 20:52:23  
Hjp, I do spray welding, and have for almost 30
years and it is a great process. However for the
cracks that he describes the old fashened gas
weld is a much better process, oxy/acetylene cast iron weld done with preheat in an oven . Needs about 900 degrees preheat,then easy off
the heat, weld some , reheat to keep the 900 deg
weld more and heat many times untill done. Post
heat to 1200 to 1500 deg and maintain for at least 1/2 hour to normalize.Wrap in asbestos
blanket and allow to cool slowly, should take
about 12 hrs to cool.

george

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