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f12 crack in block

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kenneth in ohio

06-02-2007 20:00:43

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What is the best way to fix a cracked block?

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Pete in Holland, MI

06-05-2007 09:36:10

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Re: f12 crack in block in reply to kenneth in ohio, 06-02-2007 20:00:43

Make sure to drill the ends of the cracks with a 1/8" drill to prevent it from traveling further prior to the JB weld.

Surface prep is key for the JB weld to bond !

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kenneth in ohio

06-03-2007 19:53:24

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Re: f12 crack in block in reply to kenneth in ohio, 06-02-2007 20:00:43

Thanks for the replies. I'll try the j b weld just need to get it going for my dad.

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Andy Motteberg

06-02-2007 20:49:49

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Re: f12 crack in block in reply to kenneth in ohio, 06-02-2007 20:00:43

I understand what you need to know. The F12 blocks crack on thewater jacket alot. Clean it up very very good and use JB weld

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Bob Kerr

06-03-2007 12:22:19

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Re: f12 crack in block in reply to Andy Motteberg, 06-02-2007 20:49:49

I have only seen 3-4 f-12s that wern't cracked on the left side. There must have been a defect in the casting design. I can't see that many of them were allowed to freeze. The one on my F-12 was welded with nickel rod and arc welder but it still leaks some when it is running. Shut it off and no drips for months.

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Charlie M

06-03-2007 08:37:31

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Re: f12 crack in block in reply to Andy Motteberg, 06-02-2007 20:49:49

I used JB weld on a crack in the block of my W30 more than 15 years ago and it still hasn't leaked a drop. Its a lot cheaper than finding a welder.

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Janicholson

06-02-2007 20:07:41

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Re: f12 crack in block in reply to kenneth in ohio, 06-02-2007 20:00:43

The analysis of the crack and selection of the best method is an on site task. If you tell us a lot more info we may be able to help.

If the crack is outside only and has both ends visible, overlapping taper plugs that screw in are my favorite. If internal and running thorugh a gasket surface, they are usually scrap. JimN

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