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Cast iron engine block

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Jack Willis

12-04-1999 17:26:11




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I have a pinhole leak in an inline 6 gas engine. I tried welding it in the vehicle with nickel rods but its on the side of the block and I have only an AC welder. It is worse now and I got a lifter hot and it now is collapsing at idle. I have pulled the engine and plan to lay it on its side to have a "flat" weld and plan to use a DC machine. Any tips would be greatly appreciated!!! It has oil pressure behind it when running otherwise I would have used JB Weld!!

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Fred Martin

12-14-1999 04:41:03




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 Re: Cast iron engine block in reply to Jack Willis, 12-04-1999 17:26:11  
Now that the engine is out, mix up some asbestos
paper and water, (knead it) and put it in the lifter bore for a backup, (so you won't have a sow's titty inside) If you're afraid of asbestos,
use clay. Put a little heat on it and burn out the oil,(must be clean or gas pockets will appear in weld) wire brush it,and then weld it. Don't weld
over 1/2 to 3/4 " at a time and peen it with the ball end of a ballpeen hammer The reason for this
is: cast iron doesn't expand and contract like
steel and the pounding on the weld while it is
still hot helps to relieve the stresses in it.
PS I've owned welding and machine shops all my adult life and done my share of those critters. Fred from the Mung Factory

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Clint Carpenter

12-09-2000 17:02:58




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 Re: Re: Cast iron engine block in reply to Fred Martin, 12-14-1999 04:41:03  
when welding cast iron you must first pre-heat the metal. Don't just heat a small spot heat most of the enjine. after welding with you're nickel rod post heat the metal. doing this will give you all of you're strength and adheation. I am only 17 but i compete in welding.



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ray

12-12-1999 14:56:23




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 Re: Cast iron engine block in reply to Jack Willis, 12-04-1999 17:26:11  
pinhole or crack? one spot of nickel and hammer
spot with ballpen for few seconds to keep from cracking. if crack grind out then weld on each end
one at a time,then hammer. 1/2" weld will do it
then every 2 " of crack do 1/2" only repeat hammer.then get Devon Con metal epoxee and apply
to reruffed surface, allow 10-15 mins then take
water put on hands and smooth out epoxee for a fine look.this works exellent.

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Steve U.S. Alloys

12-06-1999 13:23:12




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 Re: Cast iron engine block in reply to Jack Willis, 12-04-1999 17:26:11  
Hi Jack,
I have a substance designed to fix pinholes in cast iron welds. It looks like a big crayon and it seals pinholes by melting the material into the problem area. As long as the temp never exceeds 350*F the pinhole stays sealed. Got some references if you need 'em. You can get it at 1-800-325-1568.



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Fred

12-04-1999 17:34:00




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 Re: Cast iron engine block in reply to Jack Willis, 12-04-1999 17:26:11  
plan on disasibling engine. when welding the metal will shrink you will need to hone lifter bores and clean oil passages. have a pro do the welding. good luck



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