diesel slobber from exhaust

johnald · Nov 10, 2014

I have a Kubota l245h that has been running fine until the other day I was cultivating carrots and black dieselish liquid started running out of the exhaust stack. I thought it was oil at first but I'm pretty sure it was diesel with soot mixed in. It spattered a little onto the hood but mostly ran down the stack.
Today I took the injectors apart and cleaned them, changed the oil and filters. The fuel filter had lots of gunk in it. I let the line run for a bit and some more gunk came out. Let it run till not much more came out and put new filter on and bled the lines. It fired up and sounded much better than before. I ran it for about 30 min. It ran great but still had some black liquid coming out the stack. No splatter on the hood but it was steadily oozing down the stack. I'm not sure if this is just leftover from before or if I didn't fix the problem. It starts fine and runs fine but I don't want diesel getting into the oil or for something bigger to go wrong and leave me stranded.
I'm thinking I might need to have the injectors tested/replaced but I'm not sure what that costs. The #2 injector was a little sticky when I took it apart. Any advice is much appreciated.
Oh I forgot to add that this happened after filling the tank with green diesel. Before it had off road in it. Might just be a coincidence.

old · Nov 10, 2014

I bet you do not really make it work hard do you?? A diesel need to be worked hard or they will in fact do just what yours is doing. Work them hard and put them away wet like the old saying about a horse

russ1 · Nov 10, 2014

Work it hard and it should go away. This
condition when the engine doesn't get up to
operating temperature long enough.

bison · Nov 10, 2014

You can stiII have a bad injector.
Taking injectors apart for cIeaning shouId after reassembIy be foIIowed up with testing on a pop tester for correct opening pressure and Ieak down.
A bad nozzIe that streams Iike taking a pizz instead of a fine atomizing spray causes poor combusting and can be the cause of fueI sIobbering from the exhaust
.

Motorcraftman · Nov 10, 2014

I have a Mahindra E-350 03 Model, with about 100Hrs on it Now, But a Few Yrs ago it did that same thing... But has Quit, when someone also told Me to Run the Snot out of it...And YES they don't like to be loafed around RUN IT! I guess the Rings hadn't seated or something... Larry

buickanddeere · Nov 10, 2014

(quoted from post at 18:40:17 11/10/14) I have a Kubota l245h that has been running fine until the other day I was cultivating carrots and black dieselish liquid started running out of the exhaust stack. I thought it was oil at first but I'm pretty sure it was diesel with soot mixed in. It spattered a little onto the hood but mostly ran down the stack.
Today I took the injectors apart and cleaned them, changed the oil and filters. The fuel filter had lots of gunk in it. I let the line run for a bit and some more gunk came out. Let it run till not much more came out and put new filter on and bled the lines. It fired up and sounded much better than before. I ran it for about 30 min. It ran great but still had some black liquid coming out the stack. No splatter on the hood but it was steadily oozing down the stack. I'm not sure if this is just leftover from before or if I didn't fix the problem. It starts fine and runs fine but I don't want diesel getting into the oil or for something bigger to go wrong and leave me stranded.
I'm thinking I might need to have the injectors tested/replaced but I'm not sure what that costs. The #2 injector was a little sticky when I took it apart. Any advice is much appreciated.
Oh I forgot to add that this happened after filling the tank with green diesel. Before it had off road in it. Might just be a coincidence.

As Bison pointed out. Unless the injectors are pop pressure tested and the spray pattern inspected. All bets are off.
What is the coolant temperature? 195F is good.
Also as previously pointed out. Diesels are designed to run in a HD application at or near rated power and rpms. Where you putting along at about 1/3 to 1/2 of rated redline?

Ray · Nov 10, 2014

Gear down and give it more rpm.You can't lug a diesel.

jm. · Nov 10, 2014

The very first line of your post told me what was probably going on. You have it idled down for too long. Get it out and open it up. Try to run it hard and maybe under load a little. When I saw the H after the model I knew it probably has not been worked. See this happen more than once a year. Just open it up and work it awhile hard. Note it may take 30 minutes or more because you have slobber in the muffler that has to be burned out.

TomR Ont · Nov 10, 2014

johnald,

When I left my Yanmar out in the rain I had three problems -
1) water entered the steering column it froze come -0 temperatures, lucky no busted cast.
2) water ran down the shifter under the boot and in the transmission which is also the hydraulics for the bucket, and froze.
3) water went in the muffler (upright muffler no cap) it slobbered all over its self, and got me, when this stuff got on skin or clothes it sunk in and spread.

gbs · Nov 10, 2014

if you disassembled the injectors best stop while your ahead pull them back out and have then pop tested you will be lucky if their set any where near right

John A · Nov 10, 2014

johnald, You are idling it too much. Sounds like you had up shifted and throttled back!
You engine is Wet Stacking Not enough cylinder heat to totally burn the fuel in the cylinders Also some oil will get by the rings too!
The Fix......Like others have said
Put a heavy plow on it, and sink it deep, them work the snot out of her for a couple of hours Should clear right up on nothing flat!
Most IH engines are ceseptable to Wet Stacking when Idleing/Working for extended periods of time
My old 966 with a D-414 will start slobbering if I am doing light chore work for over 2 hrs so I do not do much of that sort of work on her.
She is happiest when working, the engine screaming at the top of her Lungs under load!!!
Hope this helps!
Later,
John A.

FBH44 · Nov 11, 2014

I agree. On my Perkins 3-cylinder, I actually sat down and read the manual. It says to warm it up at 1200 rpm, for 3 minuutes, not just idle it and lug it along. And operate at 1700 rpm, not just idle it. I bet yours is similar.

Texasmark1 · Nov 11, 2014

Even though I live in TX. I never start and run my tractor without
running it till it gets good and warm. Sometimes in the winter I'll
put a piece of cardboard across the radiator to help her get up to
temp. Takes a few minutes but it's worth it and agree on getting
the rpms up. I too read that idling is bad for an extended time and
I think it too was in my MF 35 manuals with a Perkie 3 banger.

Mark

johnald · Nov 11, 2014

thanks for the replies. I'll start giving it a little more throttle. I mainly use the tractor for cultivation so it doesn't ever really pull a heavy load. I'll find a chore for it to do every now and then to really work it. Also, I've only had it for a short time. Only ran one tank of fuel through it.
I pulled the exhaust manifold off and it has a ridiculous amount of carbon build up. Like almost a half an inch thick. Any ideas on how to clean it out where I can't reach with a scraper?

Texasmark1 · Nov 12, 2014

I know that water leaking into a cylinder on a 1966 Chev 6 cyl
from a cracked head will clean up the cylinder and piston crown
like it was brand new.

I know in years past they had a water injection system that was
supposed to increase gas mileage. Most folks thought it a scam
at the time. Don't know if it worked.

Also had outboard motor folks say the same thing when they
had a corrosive pin hole in the side of the cylinder into the water
jacket.

Best I can do.

Mark

johnald · Nov 12, 2014

thanks for the info. I found a wire brush that just happened to be the right size to fit in the manifold. Between that, a screwdriver and some carb cleaner I was able to get it pretty clean. There was enough crud to fill up a mason jar and the manifold isn't very big. We'll see how it runs now.

buickanddeere · Nov 12, 2014

(quoted from post at 09:59:44 11/11/14) thanks for the replies. I'll start giving it a little more throttle. I mainly use the tractor for cultivation so it doesn't ever really pull a heavy load. I'll find a chore for it to do every now and then to really work it. Also, I've only had it for a short time. Only ran one tank of fuel through it.
I pulled the exhaust manifold off and it has a ridiculous amount of carbon build up. Like almost a half an inch thick. Any ideas on how to clean it out where I can't reach with a scraper?

Imagine how stuck and carboned up the rings, combustion chambers and the ports are ?
Wide open throttle, redline revs, max load , pull the air cleaner and spray water into the intake until it bogs a little then keep spraying until the engine cleans up.

diesel slobber from exhaust

johnald

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old

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russ1

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bison

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Motorcraftman

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buickanddeere

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Ray

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jm.

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TomR Ont

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gbs

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John A

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FBH44

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Texasmark1

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johnald

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Texasmark1

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johnald

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