3.9 cummins engine - The Combine Forum
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post #1 of 13 (permalink) Old 04-09-2018, 12:53 AM Thread Starter
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3.9 cummins engine

any body have any luck with a machine shop weld and plane down a block where a head gasket blew out and made a gouge in between to piston holes in a cummins engine and that it lasted like a new block,the head has a matching gouge in it to but not as deep thanks for any ones replies

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post #2 of 13 (permalink) Old 04-09-2018, 01:09 AM
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I wouldn't even consider trying to weld that.
Chances of success are minimal.
Be best to look for a used engine, or good used head and block.

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post #3 of 13 (permalink) Old 04-09-2018, 01:25 AM
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It can be done, but the old timer I knew with that skillset passed away about 10 years ago.
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post #4 of 13 (permalink) Old 04-09-2018, 01:49 AM
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Oh man, that's a tough one, problem is it will warp, and possibly also make the cylinder not round, due to the combo of both heating the cast sufficiently and the welding itself.
Being the head is gouged as well.. new engine time me thinks.

Worth a try, and mic it after, will need to be decked most likely. Since it's cheap to try, but guy needs to have good experience (old timer).
Most likely won't work, but I'd try it.
I tried to weld an orbital motor crack last year, failed miserably, no load even.
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post #5 of 13 (permalink) Old 04-09-2018, 02:34 AM
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Ouch!
It had to have been pretty hot to have done that so I would suspect the head to be junk.
Since I'm thinking you need a different head I would start shopping for another engine. Spendy project I know.

Was that a turboed engine?

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post #6 of 13 (permalink) Old 04-09-2018, 03:14 AM
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I don't think it got hot, just a ton of air and fuel whistling through a blown head gasket..

I wonder if they can nickasil that? I had a piston explode one time and the walls had massive gouges in them, they nickasiled that hole and the motor ran 100% after that hole was cleaned up! My head was hammered up too, but there was enough meat left to mill it down.

To nickasil stuff isn't too expensive, they somehow electroplate pure nickel to the cast with some sort of splatter method, and it is solid I tell ya! Ask if that is an option.
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post #7 of 13 (permalink) Old 04-09-2018, 07:15 AM Thread Starter
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no it did not get hot it just started to miss and back fire when it happened yes it is a turboed engine on a 276 verastile tractor with a snow blower on that had a work out the last little while
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post #8 of 13 (permalink) Old 04-09-2018, 07:42 AM
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It will buff out....

Ant...
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post #9 of 13 (permalink) Old 04-09-2018, 08:15 AM
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Dad used a high nickel rod on a JD 5010 forty years ago, I think it's still running.

I'd mig it it's a lot cooler than arc
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post #10 of 13 (permalink) Old 04-09-2018, 08:25 AM
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We'd probably weld it and get it planed.

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Why is there never time and money to do it correctly but there's always plenty to do it again
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