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Old 04-05-2017, 09:33 AM
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Default Detroit 3-71 diesel engine.

I am looking a purchasing a 45kW generator, 3 phase. It has a
Detroit 3-71 diesel engine for power. Is that a good engine? It
is a former military generator.
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Old 04-05-2017, 11:17 AM
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It's a Detroit and former military. How can you go wrong? Military does not buy junk.


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Old 04-05-2017, 11:25 AM
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In it's day it was a great engine use to power almost every thing within tis power rating . It is a two stroke engine with a roots style blower meaning that it is a pressurized engine that will leak oil as it runs. They convert 60 % of the fuel to noise 25% is used to create carbon in the exhaust system which mixed with the oil pumped into the exhaust because it is a two stroke leads to spectacular soot and ember emissions when they light off. They also consume fuel faster than an Irishman drinks beer on St. pats day. Other than that they are good reliable units.
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Old 04-05-2017, 11:32 AM
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Quote:
Originally Posted by terry lingle View Post
They also consume fuel faster than an Irishman drinks beer on St. pats day. Other than that they are good reliable units.
This is why you only see them as emergency back up gensets.
The local gravel pits all run other engines, as it was explained to me:
"The amount of extra fuel they use, at the end of a years running,
you can literally float the genset on the extra fuel"

You want a back up genset that you kick in the ass, and it'll run ?
You want one that a 14 year old Amish kid with a crescent wrench can get running ?

Yes the Detroit on both counts.
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Old 04-05-2017, 12:51 PM
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Yup...good engines.

Noisy as the devil, thirsty as an Irishman and reliable as snot.

My father-in-law was a mechanic all his life and he always used to say that the 3-cylinder jimmies were so noisy because they were p*ssed they didn't get a fourth cylinder and had to run that much harder to keep up.

Sweet sound when you first rev 'em up but it wears on you if you have to listen to it for too long. Back when we were tractor pulling there was a local guy who used to run a big Oliver tractor in the stock classes. He had her tuned pretty nice and when he cranked her up and headed down the track she really had a sweet tone to her exhaust. Trouble was, when he wasn't competing they used his tractor for a pull-back rig--even though he wasn't running her full out the sound got to you after a while--drowned out everything else. They call 'em "screamin' jimmies" for a reason...
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Old 04-05-2017, 12:51 PM
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I run two drip-troits a 6-71 and a 6V-92. Yes they both leak oil (They are marking their territory.) The 6-71 is 64 years old and in a 20,000lbs vehicle gets about 10.5 mpg. The 92 series at 40,000 gets about 6mpg, at 41 years old. They start easy, don't smoke excessively and are easy to maintain. If I were running them in a business, I would probably run something more efficient, but for what I do with them, I can't complain. You'd only laugh anyway.
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Old 04-05-2017, 12:59 PM
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Quote:
Originally Posted by Norm W View Post
but for what I do with them, I can't complain. You'd only laugh anyway.
Making the world a better place by hauling 40,000 lbs of accordion's,
banjo's and bagpipes to the dump ?.....
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Old 04-05-2017, 01:46 PM
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Probably a good unit/buy. I'd be more worried about the alternator than the engine. The engines are pretty good to go. Leave the god damn muffler on it and you won't really be bothered too bad by noise. I would plan to have it a good distance from habitable buildings though......

If you can get your hands on a megger or a good DVM with insulation resistance tester (hipot) you tell the health of the windings. Mice, age and moisture are the biggest causes of failure. Also condensate in the bearing on the genend plays hell with some of them.

Can you get a pic of the gen end? How about a pic of the controls? I'm sure it's all old analog stuff which is a tinker-ers wet dream.........
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Old 04-05-2017, 02:02 PM
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Here is a 15KW

https://lubbock.craigslist.org/tls/6066049812.html
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  #10  
Old 04-05-2017, 03:42 PM
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Quote:
Originally Posted by GWIZ View Post
Too expensive...
Too small...
Too far away...

But thanks for the search.
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Last edited by Shade Tree Welder; 04-05-2017 at 03:51 PM.
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