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Old 05-15-2013, 05:46 PM
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Checking An Engine block for Cracks

I found a really good deal for a Cummins engine, complete, needs rebuilt, but because of the low price i am skeptical that the block and head are free of cracks, how can i test the block and head quick and on the fly before i buy it?
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Old 05-15-2013, 05:50 PM
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google for "automotive machine shop" in your area. Any decent shop will be able to magnaflux them for you.
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Old 05-15-2013, 05:59 PM
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I know how to magnaflux, i just dont have the stuff for it and its not cheap, i was looking for something quick i could do right there before i buy
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Old 05-15-2013, 06:21 PM
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Quote:
Originally Posted by twenglish1 View Post
I found a really good deal for a Cummins engine, complete, needs rebuilt, but because of the low price i am skeptical that the block and head are free of cracks, how can i test the block and head quick and on the fly before i buy it?
In the field a dye is the quckest way but even that isn't easy. Problem is that the thing needs to be pretty clean and where many cracks form is on the inside so the engine needs to be in pieces.

Crack Detection Dye Penetrant | FLAWFINDER

Bogie
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Old 05-15-2013, 06:30 PM
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The engine is in pieces, head removed oil pan removed, I might try the dye, where should I be looking for cracks? I know around the injector ports on the block side, where else is common? It's also a 56 casting number, which is known to be one of the strongest
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Old 05-15-2013, 07:28 PM
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It does not coat all that much to have the block and head tanked and checked..How is your taste for gambling..??

Sam
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Old 05-15-2013, 07:58 PM
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I think I will take a gamble on it, he is including enough good parts where I should be able to make money back if the block and head are junk,
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Old 05-16-2013, 06:43 AM
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I read some where that if you hose down the cylinder walls with WD40 then wipe it out the WD40 dissolves oil/carbon that has been trapped in a crack an it can be seen. Not real sure on this be it can't cost anymore than a can & paper towels.
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cracked block, cracked head, cummins, diesel, test

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