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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

help with detroit in an excavator

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mike

01-21-2004 17:17:40




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Help i need a second (or 3rd) opinion on what may be wrong with a detroit 8v71 i'm looking at. heres what happened motor was overheated bad total loss they said they went and bought a motor that was supposed to be a good runner but the injectors were out of it a friend was working for them and put this motor in the machine (he is very capable mechanic)put new inj in the motor and put the ind. bellhousing on got it all together and fired the motor fired right up ran about 20 seconds and he shut it down to put water in it filled it with water and restarted it and it dumped the water into the pan we suspect a split copper inj. tube or one missing what do you think thanks for any info and ideas mike

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Wayne

01-21-2004 19:51:00




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 Re: help with detroit in an excavator in reply to mike, 01-21-2004 17:17:40  
Hey Mike, the only way I know of on 71 series Detroit for it to dump water like you are saying it did is either a split injector tube, several of the water jacket seals leaking, or a cracked block or head, or both. I have to agree with Greg, the best way to determine where it's coming from is to pressurize the cooling system and look for the leak. If it's coming from a split tube, then you can probably pull the valve covers and see the leak from the top, since it seemed to be going directly to the pan. If it was going out the bottom end of the injector tube it would have pooled on top of the piston before it went to the pan and should have locked the engine down if you tried to turn it. Too if the effected piston was down at the time you'd probably have seen some water running out of the airbox drains before it got past the rings and on to the pan. Whatever the problem, it's not gonna be an easy or cheap fix. Like Bob said, you get a "good running" engine that's missing parts, it's always suspect...I mean why rob parts, especially a set of used injectors, from a good engine? Just my .02

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Bob/Ont

01-21-2004 18:09:41




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 Re: help with detroit in an excavator in reply to mike, 01-21-2004 17:17:40  
Mike, you gotta be suspicious when you get a good engine the injectors are pulled out of or anything else is apart. Have to start from page one now I think. Later Bob



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GregD

01-21-2004 17:30:32




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 Re: help with detroit in an excavator in reply to mike, 01-21-2004 17:17:40  
Me thinks your friend isn`t as good a mechanic as you think he is. How about filling the cooling system BEFORE starting the engine?????!!!!! I don`t recall the ammount of time it takes to crack a head without water in the system but it isn`t very long at all. True you could have a copper leaking, but by what you describe, I would lean toward other problems. Pull the oil pan and pressurize the system and try to see where it is coming from. Good luck.

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Russ

03-07-2004 13:45:19




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 Re: Re: help with detroit in an excavator in reply to GregD, 01-21-2004 17:30:32  
Detroit in XKvator; I agree with the GregD approach. If moneys a problem what is it worth
as scrap metal?



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goofus fr L.A.

01-25-2004 07:49:59




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 Re: Re: help with detroit in an excavator in reply to GregD, 01-21-2004 17:30:32  
Greg, 20 seconds without water didn't hurt the engine. If it did, I would still be chasing down a pair of mules, and hooking up the wagon, every time I take my mother n law back home. goof



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