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8N 1949 cracked engine block

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Michael Jones

05-14-2002 10:09:55




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Need to find a block or possible fix to a 6 inch crack on the left side of the block which passes through the center of the drain cock. Engine started fine but leaks water out of the crack. Most likely due to freezing during the winter




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Paul

05-14-2002 10:48:10




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 Re: 8N 1949 cracked engine block in reply to Michael Jones, 05-14-2002 10:09:55  
I've got a '52 with about 12" of crack on the left side. The guy who fixed it JB it. Didn't do a very good job since it has strarted leaking. JB weld can be good if done right. Surface prep is everything. Remove ALL oil and grease. Gouge out the groove. Scuff the edges out about a half inch on either side. Smear it on and hope for the best.I have to do a rebiuld so I am going to weld mine. Pre-heat, Ni rod and then cover whith a brass bead to seal it
Hope this helps you, Good Luck, Paul

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JAMES

05-14-2002 10:20:26




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 Re: 8N 1949 cracked engine block in reply to Michael Jones, 05-14-2002 10:09:55  
1 OF MY BLOCKS CRACKED AFTER THEY BORED OUT A SLEEVE AND PUT A JUG
NOW IT IS CRACKED UST FROM SITTIN NO WATER IN RADIATOR
RE
THEY TOL ME 2 DRILL SMALL HOLES AT THE END OF THE CRACKS THEN ROUGHEN UP AND USE JB WELD WITH A PLATE ON TOP TO HOLD IT ALL TO GETHER



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Rob

05-14-2002 10:42:18




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 Re: Re: 8N 1949 cracked engine block in reply to JAMES, 05-14-2002 10:20:26  
That business about drilling the holes at the end of the cracks seems to be the way to go. I feel like welding is a last resort and needs to be justified by the stresses or someother reason like it's threaded or supporting a shaft or somesuch.
There where you're talking about is a good candidate for epoxy but you will be in for a better job if you can open it up some. A better looking job and a complete seal rather than a patch thrown over the top. For instance, grinding it out so you can put epoxy into the crack and below the surface of the block would be good. In that case you would be able to finish the repair off even with the surface of the block and you would have a bond to each side of the crack. The cut made by grinding would give you a clean and oxide free surface to bond the epoxy to. I'm sure it would look better then a surface patch and I think it would be a stronger and more certain repair.
If you don't get the epoxy the way you want it you can usually put heat to it to make it soft and scrape it or brush it away. Propane torch will give you the heat.
Good luck.

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bj/8n/mt

05-14-2002 10:15:01




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 Re: 8N 1949 cracked engine block in reply to Michael Jones, 05-14-2002 10:09:55  
Check posts from yesteday about this same issue. If it is only cracked to the outside might be fixable with epoxy [JB Weld] or might be weldable. I would at least investigate before I gave up on the block especially if the machine otherwise runs well.

YOur mileage may vary



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