Oil & Fuel JD 955 burning engine oil

[tag01]

I started this thread in the JD user forum but was advised to move it to Yanmar, I purchased a 1990 JD 955 with 963 hrs back in January. I changed all the oils, filters and fluids before using. In 10 hours of full throttle medium duty work the engine oil on dipstick went from the full mark to the add mark. Is this normal or is it time for an engine overhaul?

 

[careyo63]

I would keep a eye on it. Check the oil the same way everytime. For me when it sits over night so all the oil drains into the pan. Does it smoke alot when it's running? Look for leaks etc.. If you are using oil and no visual leaks then most likely time for new Piston Rings. IMO.

 

[winston1]

A lot depends on the user. I would say yes, you have a good bit of wear, however, adding a little oil doesn't bother a lot of folks. Some people don't like it at all. Do you have a good deal of grayish smoke when working? Does your vent tube look anything like this? [ame=http://www.youtube.com/watch?v=OLwUS_QGOhU&NR=1]Yanmar 155D Crankcase Vent - YouTube[/ame] Not sure why John Deere refereed you over here but welcome. You have a Yanmar 3tn84rj engine.

 

[284 International]

it seems like the quart or more of oil burning would make significant amounts of blue smoke. Is it possible you're losing the oil somewhere through a leak?

 

[tag01]

Thanks for the replies, It smokes a little during warm up which is normal for any diesel. After warm up when I crack it to full throttle then it puffs a small cloud of bluish smoke then the exhaust clears up. However when I was mowing the other day (full throttle) up against a building on the exhaust side when the exhaust hit the darker background of the building it kind of mushroomed out and I could see a tint of blue. On the video of the vent tube I checked that a couple weeks ago and you had to really look hard to see a tint of blue, but I do not remember if engine was idleing or if it was full throttle when I checked it. I will recheck it tomorrow and get back to you.

 

[clemsonfor]

How many hours are on it? If you said i missed it. It does sound like your burning oil, but honetly unless you want to spend several hundredand pull the pistons etc to re-ring. I think i may just live with that oil use for some years to come. After all how many hours do you put on it a year? If you mow grass each week to the tune of like 5 acres i could see a bunch of hours but i put like 40hours a year on my tractor, so thats like 4 qts through the year which is not that much when you think about it. NOw if your like a farmer or use it in business and run it 10 hours a day, dont think this is the case with this size tractor, but it my be annoying then. But really you should check oil each time you run something so it should not "catch you by suprise" one day and be out of oil if your checking.

 

[homephysician]

hi yall, i looked at the video and while a haven't seen the smoke from the vent tube, i have seen evidence of an oil on the axle where it exits. i am using some oil too and it does smoke while working under load. is the vent residue a ring issue? or is there another repair? thanks, hp

has 780 hrs.

 

[DieselMonk]

When you replaced the engine oil, what kind of oil did you use?
The engine is worn, as there is quite a bit of blow by. Must be a piston ring / cylinder wall issue. Depending on what you want to do with the tractor, keep it for long time or sell it, I'd put on new rings and check the valves, or not.

 

[winston1]

hi yall, i looked at the video and while a haven't seen the smoke from the vent tube, i have seen evidence of an oil on the axle where it exits. i am using some oil too and it does smoke while working under load. is the vent residue a ring issue? or is there another repair? thanks, hp

has 780 hrs.

Put your hand under the vent tube and see how hard or if it is blowing. If so, most likely ring blowby.

 

[tag01]

Mr Winston and others, no blow by out of vent tube. So correct me if i am wrong, the piston is a slip fit inside of the bore of the cylinder and the rings seal up the slip fit clearance to achieve maximum compression. Having said that then where or how is the crankcase oil getting into the cumbustion chamber to exit the engine as light blue exhaust smoke? The tractor is a 1990 JD 955 with 963 hrs. Plus ll JD 15-40 engine oil is what I am using not sure what previous owner used. Other than engine oil going from full to add in 10 hours tractor starts good, runs smooth, plenty of power. Someone from the JD forum said to change oil more frequently and use a high detergent oil for a couple changes. What brand and weight high detergent oil would any of you recomend?

 

[careyo63]

Walmart.com: Super Tech Universal Motor Oil 15W40, 1 gal: Automotive

I would keep oil in it and at 2.75 a QT. every 10 hrs. isn't much to worry about cost wise. IMO.
Run it until it quits. a Eng. rebuild unless you do it yourself Big Bucks. Still costly either way a Shop/Mechanic or do it yourself. It could get better on the oil use the previous owner may not have ever changed it and that may have caused the problem. My bet it won't get any worse for a long time if you keep up with it down to 2.40 a Qt or 25 cents an Hr. if you buy 2 Gal.

 

[Neat 1500]

i use Delo 400 in both mine, the 1500 uses nothing between services but the 14 uses a little, i am surprised it is not more as it smokes a bit but uses little. i also use it in my Landcruiser and swear by it.

 

[clemsonfor]

Mr Winston and others, no blow by out of vent tube. So correct me if i am wrong, the piston is a slip fit inside of the bore of the cylinder and the rings seal up the slip fit clearance to achieve maximum compression. Having said that then where or how is the crankcase oil getting into the cumbustion chamber to exit the engine as light blue exhaust smoke? The tractor is a 1990 JD 955 with 963 hrs. Plus ll JD 15-40 engine oil is what I am using not sure what previous owner used. Other than engine oil going from full to add in 10 hours tractor starts good, runs smooth, plenty of power. Someone from the JD forum said to change oil more frequently and use a high detergent oil for a couple changes. What brand and weight high detergent oil would any of you recomend?

As the oil is splashed up by the crank or from the compression gasses that are blowing by one cyl, into other cyl walls. Your worn rings dont scrape the oil down from the cyl walls and that residual oil is burned in the combustion.

 

[winston1]

Possible you could have a broken oil wiper ring on a piston. Having said that I would probably do as some others have suggested, run it and keep the oil level where needed. I don't believe oil brand change or additives will cure it. Just my opinion. :thumbsup:

 

[clemsonfor]

Yea Oil brand is irrelevant. Any good deisel oil, wether its name brand walmart, gas station oil is going to work just the same.

 

[tag01]

Thanks for explaining the rings. A local JD mechanic told me not to touch it other than maybe do the detergeant oil change a few times.

 

[shawnjvl]

I sent you a PM.

 

[clemsonfor]

Further explaining it, i think there is either 2 or 3 rings per Cyl. I cant remember and am to lazy to go to the Hoye site to look it up. Like they said there is wiper rings that wipe the oil down on the piston down stroke and there is a compression ring. If there is 3 rings i guess you have maybe 2 compression and 1 oil wiping ring. Im no expert either but it works in some combinantion of this.

 

[Car Doc]

I see where you used JD oil that is good long as its not synthetic I am not sure if they even use any but just saying.

I got on here to say if you started using synthetic and it started using oil thats the most obvious reason but maybe not the case. I use Rotella T 15-40 these are old school loose tolerance engines plain old diesel dinosaur oil works the best.

 

[tag01]

I use Rotella 15-40 in my red iron farming tractors so may switch to that after a couple hi detergeant oil changes. Will be interesting to see how many hours I put on it over the summer, boy is it handy I should have made this move years ago.