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John Deere Tractors Discussion Forum
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4255 turbo

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Joe

11-06-2003 15:45:52




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Friend has a 4255 fwa. Had oil coming out from where turbo mounts to the exaust manifold. He had the turbo replaced. About 2 months later it started having oil coming out the same place. The tractor works good and is used for hard pulling so it does not sit around idling much. My question is could the new turbo be bad or does he have other problems? Thanks for any help.




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Brokenwrench

11-07-2003 08:03:53




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 Re: 4255 turbo in reply to Joe, 11-06-2003 15:45:52  
One more thought, what is the condition of the air filters? I have seen them clogged so bad that the turbo will suck oil past the seals causing a slobbering/leaking condition that you are describing. As dry as it has been in some areas it only takes 3-4 hours to choke a set of filters.



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WTW

11-07-2003 07:01:21




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 Re: 4255 turbo in reply to Joe, 11-06-2003 15:45:52  
Joe, Lets take the common sense approach to your problem. First thing there is a very good chance there is nothing wrong with your turbo. If this residue that you are seeing is oil from the engine or turbo, a large amount of oil consumption would be a tattle tale factor to consider that problem is engine or turbo related due to turbo seals, piston rings or valve seals. Hard starting would support the possibly of poor rings. Good chance that the engine condition is not a factor either. Being the tractor runs good under load I would have it dynoed to see if fuel setting has been tampered with and if it has this could be causing the engine to wet stack prematurely more so than a normal fuel setting would. Most likely the black oil residue that you are seeing is tar from un-burnt fuel causing wet stacking. Things that cause wet stacking are injectors in need of service and thermostats in the engine cooling system not allow the engine to warm up enough at idle or no loads. Cold running engines will not effectively burn the fuel (possibly excessive fuel). When put under load extra heat generated from the engine will over come the cold running condition and engine will burn clean again. If the engine will not reach operating temperature after starting without loading the engine it needs thermostats. Some things to check and consider. Hope you get it figured out. Good Luck, Dave W.

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G-MAN

11-07-2003 11:56:25




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 Re: Re: 4255 turbo in reply to WTW, 11-07-2003 07:01:21  
I thought that what I posted was pretty common-sense, but maybe I was wrong. With excessive overfueling, wouldn't you expect to see some other symptoms, such as excessive blowby and low power from washed-down and scuffed liners? If you're getting enough fuel to have it coming out of the exhaust, the oil film in the cylinders isn't going to stand a chance. I'm not diasgreeing with you - it could very well be fuel related, but I think my suggestion about pulling the exhaust manifold would be the easiest quick-check. Fiftenn minutes after the hood is off, that manifold should be laying on the bench. Pulling nozzles is also cake, but a little more involved. Either way, I think we do agree that it isn't the turbo.

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WTW

11-08-2003 06:26:38




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 Re: Re: Re: 4255 turbo in reply to G-MAN, 11-07-2003 11:56:25  
G-man, The excess fuel may not be so much that it would be causing the effects that you mentioned but be enough to cause the engine to slobber at an idle especially if it was running cold. It could do what you said if they really had her opened up allot but I agree there would be other signs indicating that. When he mentioned it seem to run fine under load is what made me have the opinions I did. I guess I shouldn't have used the word excessive and rather said turned up. Another one I have seen on chore tractors that do allot of idling around and never get pulled hard is these engine will slobber themselves to the point the exhaust port will be restricted. I do not feel that is true in this case as he mentioned it ran good under load and he didn't say it was a dog either. Removing the manifold as you suggested would clarify this pretty fast though. DW

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G-MAN

11-08-2003 09:28:59




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 Re: Re: Re: Re: 4255 turbo in reply to WTW, 11-08-2003 06:26:38  
I definitely agree with your theory, but he did say that the tractor does not spend a lot of time idling, and it does get worked hard. One way or another, it shouldn't be too hard to diagnose. It's too bad he spent big bucks replacing a turbo that may not have been faulty, even though fixing the actual problem probably won't be cheap either, be it a fuel problem or weak engine.



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Joe

11-06-2003 19:00:23




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 Re: 4255 turbo in reply to Joe, 11-06-2003 15:45:52  
I forgot to mention the turbo is a brand new from Deere. The tractor only has 2500 hours. I was thinking it was the engine. But what could cause the engine to slobber oil out the exhaust? Broken rings? I was told to reset the valves,but I dont know if it will help.



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G-MAN

11-06-2003 16:06:17




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 Re: 4255 turbo in reply to Joe, 11-06-2003 15:45:52  
The fact that the turbo has been replaced once seems to suggest that the turbo isn't at fault, or at least wasn't, although the new one COULD have failed. Is it a rebuilt, new or what? Who from? Brokenwrench has a point about the drain tube being plugged, You might be able to get the drain tube wrangled out of there enough to blow some air through it and see if it is plugged, but I've personally never seen one plugged yet. If the oil is coming from the turbo itself, it should either be getting blown out the exhaust, or pulled into the intake and burned. It would very hard for oil leaking from the turbo to make it's way back to that joint, against the flow of exhaust. That it's coming out where the manifold meets the turbo would suggest to me that the oil is coming from the engine. I would warm the engine up good, remove the exhaust manifold (you'll have to remove the intake, which will provide an opportunity to check it for oil leakage as well), plug off the turbo supply line and start the engine with the manifold off. Look for oil slobbering out of the exhaust ports, due to worn rings or valve guides.

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Brokenwrench

11-06-2003 15:58:52




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 Re: 4255 turbo in reply to Joe, 11-06-2003 15:45:52  
The turbo could be bad or the return line and or passage back to the engine may be clogged causing the oil to bypass out the turbo.



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Alvin n Ms.

11-07-2003 05:57:49




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 Re: Re: 4255 turbo in reply to Brokenwrench, 11-06-2003 15:58:52  
I thought all tractor turbos did that. I owned a 1135 MF that was so bad that I removed the turbo and ran without.



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