Detroit 6-71N Questions - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 01-16-2009, 10:16 PM Thread Starter
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Detroit 6-71N Questions

Not having owned one,

Is the 1975 Detroit 6-71N engine a good design? I have read that in some applications it is highly regarded. I purchased a generator set with one recently, and was wondering if there are things I should know about their care and maintainace. It has 650+ hours on it, and has been inside and exercized weekly. We have mostly Cat and JD diesels with a couple of E7 Macks as well. Never had a 2 stroke Detroit before. Need advise on engine oil, and change intervals...Thanks Kirk

Last edited by 300 H&H; 01-17-2009 at 03:24 AM.
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post #2 of 8 (permalink) Old 01-17-2009, 06:26 AM
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The 6-71 detorits been around for many moons {years } and they are pretty dependable.

Yeah they are damm good noisemaker for sure anyway here a quick basic majorty of detroits like to run straght weight oil typically 30W is most common expect they hold about 35 Liter of engine oil in there and for oil change time useally 150 ~250 hours running time.

The crictal item it don't matter which diesel engines is wetstacking do not run the engine unloaded any longer than have to and I useally from time to time run them in load bank { a monster sized toaster if ya get the idea } to load up the reason why I do that so that way keep the exhaust pretty much clear of wet fuel/lube oil in the muffer if have one.

And the other thing make sure the airbox drain is not blocked otherwise it can make the engine runaway once you get plenty lubeoil in the piston.

Some of the detorits do have air shut off valve right front of the blower the only time you can used if the engine start to get serious overspeed and the air valve will close the intake { at the same time the fuel rack should be in zero fuel postion }

If you have more question few of the members in here will answer for ya.

Merci,Marc
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post #3 of 8 (permalink) Old 01-17-2009, 04:46 PM Thread Starter
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Thanks French,

Sounds like I had better find the air box drain....is it under the super charger? Front or back end of the engine? This engine has only had warm up times when it was exercized, and there is fuel on the exhaust side of the block. Sounds like it could use a good work out to get it good and warm, keeping the exhaust dry. But with this low of hours and weekly starting, wonder if this is not hard on this engine, and will it shorten it's life? I have read here about cylinder glazing idling these engines. Great records have been kept, with oil sampling, I need to read through all of these. Thanks Kirk
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post #4 of 8 (permalink) Old 01-18-2009, 03:16 AM
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Typically most inline detorits the airbox drain typically are located toward to the flywheel side { rear } but some case not often but you will find two { the only time you will see more than two is the vee type engines }

I will suggest that you get ahold of electrician or generator tech person so they can able rig up a load bank so you can able load the heck out of the engine { I do that pretty often unless the building system that the generator load can take it at least 70% full load other wise run the building system plus load bank so you can able get up to the max KW rating }

You can able goggle Detorit Diesel engine and it will come up alot of good points related to this engine and good tips for mantance work.

Merci,Marc
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post #5 of 8 (permalink) Old 02-28-2009, 04:51 PM
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You can find air box drains at all four corners of the block sometimes. They are a small fitting at about middle height with a drain tube that runs down to about oil pan level. They will run forever if decent maitenance is done. Oil capacity depends on pan, use 40 wt oil. 650 hours is just the begining for this engine.
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post #6 of 8 (permalink) Old 03-01-2009, 04:38 AM
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at the drain tube(s) put a coffee can under each one to catch oil if you decide to run it for any amount of time. it will save you a mess and a few bucks on oil.

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post #7 of 8 (permalink) Old 03-01-2009, 06:17 AM
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Quote:
Originally Posted by ddctech View Post
You can find air box drains at all four corners of the block sometimes. They are a small fitting at about middle height with a drain tube that runs down to about oil pan level. They will run forever if decent maitenance is done. Oil capacity depends on pan, use 40 wt oil. 650 hours is just the begining for this engine.

DDCtech.,

You say 650 hours that IMO it pretty long for detorits if only start up and run for few minutes { if run for exersize only } from my past experince typically 250 hours sound right if only used for stand by use but for prime running time that can get that far without much issue if keep the lube capicty full if have automatic lube filler ya it can go much further.

up in cold area 30 wt oil work just fine in most case unless you have combation of block heater and oil heater then you can run in 40 weight oil.

I know the larger detorits { 149 and larger } typically take 40 weight oil and can go much heveier much as 60 weight Most EMD's seems happy with 50 weight oil.

Merci,Marc
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post #8 of 8 (permalink) Old 03-02-2009, 03:52 PM
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Yea buddy SAE60 Detroits love SAE60. . .
I have SAE60 AMSOIL synthetic on every unit i own sept the sled n ATV n the Stude, as its in clean out stage will be getting AMSOIL this summer.

Example:
My 6.5-T used 1qt of 15w-40 Dino oil every 1,500miles with a double shot of lucas. Now with AMSOIL SAE60 it's more 1/4QT every 3,000 miles with no lucas.

Plus with it being synthetic the SAE60 slow better in Winters cold temps better and faster then the 15w-40 Dino oil. . .

The 62 GMC n 77 Ford don't use or leak a drop always full.

The 59 Mack uses about a 1qt-1.5qt between filter changes, with lucas only about half that.

The 69 AMX n 92 T/A always full always clean.

All of my Vehicles get the same service intervals:

Oil filter every 3,000 miles.

Fittings greased every 6,000 Miles.

Oil change every 9,000 miles.

Fuel filter Air filter Coolant filter every 18,000 miles.

Gear Lubes changed every spring unless they get wet.

Coolant every other spring.

Mike

1953 REO M48 w/w.
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