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Old 12-27-2013, 04:34 AM
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jksweld jksweld is offline
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Default Big 40 Diesel tryin to die!!!!

Well my Big 40 is giving me trouble, dont have the serial number but its a 99 model. Was using it as a gen after Sandy went thru when the trouble started. Had been running it 2-3 days on and off, mostly in middle of the day. Kept a good check on the oil and coolant as I was running it, since it was 100 deg here everyday. It has the 120v duplex receptacle, was running a tv, sat box, 120v window a/c and fridge, a/c and fridge not at same time. Didnt act like it was struggling with the loads, an all of a sudden it lugged way down and started blowing black smoke out the exhaust, like the amps was turned wide open and air arcing with it. Checked out the situation an seen oil burping out the fill tube/dipstick.

I was told to check the oil breather tube for plugging. Couldnt find one.
Someone else said the board was bad, havent checked that yet.
Engine sounds fine, just like it normally would when its under a hard load
Still generates power just fine and welds

It had been setting for probably a year or so untill this

Any Ideas??
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Old 12-27-2013, 07:37 AM
Eremius Eremius is offline
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Seat of the pants diagnosis, sounds like a ring is either sticking or shattered. If it was running at the time I would guess the latter...

Best way to find out is to run a compression check.
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Old 12-27-2013, 08:35 AM
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Fire it up and CAREFULLY loosen one injector line at a time. Take great care not to get fuel mist in your eyes or in your skin. If you have a problem with a cylinder when you loosen a line the engine tone/rpm won't change much. If you get through all the cylinders and each one seems to affect the rpm/tone equally that will be another test.

First and foremost change the fuel filter.

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Old 12-27-2013, 08:52 AM
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Not having a serial number or more specifics...

am going to do some guessing...

you said 99.... so this manual should be close..

http://www.millerwelds.com/om/o474u_mil.pdf

That would give you the Teledyne TMD-20 3cyl watercoolsd diesel for powerplant...

Might be something as simple as a stuck injector or plugged fuel filter...crap fuel??

first thing I would do is replace fuel filter and add some fuel conditioner... with good fuel..

that is where I would start

had it been allowed to run out of fuel??..... partial loss of prime? maybe??... would bleed the injectors...

if you get the serial number from the ENGINE dataplate... you could download the engine Specific service manual... here

http://www.wisconsinmotors.com/support/

and then go from there..

Operators/Service Manual download.. for that engine family here..

http://www.wisconsinmotors.com:8080/...air_manual.pdf


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Last edited by H80N; 12-27-2013 at 09:10 AM.
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Old 12-27-2013, 09:22 AM
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Quote:
Originally Posted by H80N View Post
Not having a serial number or more specifics...

am going to do some guessing...

you said 99.... so this manual should be close..

http://www.millerwelds.com/om/o474u_mil.pdf

That would give you the Teledyne TMD-20 3cyl watercoolsd diesel for powerplant...

Might be something as simple as a stuck injector or plugged fuel filter...crap fuel??

first thing I would do is replace fuel filter and add some fuel conditioner... with good fuel..

that is where I would start

had it been allowed to run out of fuel??..... partial loss of prime? maybe??... would bleed the injectors...

if you get the serial number from the ENGINE dataplate... you could download the engine Specific service manual... here

http://www.wisconsinmotors.com/support/

and then go from there..

Operators/Service Manual download.. for that engine family here..

http://www.wisconsinmotors.com:8080/...air_manual.pdf


Only thing I would change/add from Heiti is...

I would drain and discard the fuel, and get a fresh batch of #1 diesel
and then add the fuel conditioner, at the max treat rate listed but no
more.

If you want to change the oil that would be okay I doubt it would help
anything but it would give you a chance to see if there are any metal
in the oil.
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Old 12-27-2013, 09:30 AM
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Quote:
Originally Posted by Shade Tree Welder View Post
Only thing I would change/add from Heiti is...

I would drain and discard the fuel, and get a fresh batch of #1 diesel
and then add the fuel conditioner, at the max treat rate listed but no
more.

If you want to change the oil that would be okay I doubt it would help
anything but it would give you a chance to see if there are any metal
in the oil.
No argument.. good advice...

Very likely you got some crap fuel post "Sandy"...

so a drain and replace is a good idea..
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Old 12-27-2013, 01:34 PM
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I ran probably 20-25 gallon of fuel thru it before this happened, fuel came from same station and I used same can to transport. As well as I can remember it didnt run out any during this.

Will try loosing the injecter lines and see what that does.

Thanks
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Old 12-27-2013, 02:15 PM
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at the very least..

I would do fuel filters and diesel conditioner..

good quality stuff like the Stanadyne..

http://www.thoroughbreddiesel.com/st...utm_medium=cpc

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Old 12-27-2013, 06:08 PM
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Quote:
Originally Posted by H80N View Post
at the very least.. I would do fuel filters and diesel conditioner.. good quality stuff like the Stanadyne.. http://www.thoroughbreddiesel.com/st...utm_medium=cpc
Stanadyne is available at any cummins retailer btw.



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Old 12-28-2013, 03:15 PM
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Black smoke and lugging down are also symptoms of lack of air. Check your air filters and if it has one the turbo.
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