801D smoking

[rabbit-1]

Hey gang,I just bought the tractor I been looking for for a long time. A 801 they say, I haven't checked the # yet. Diesel, power steering, live power. I know just enough to mess thing up, thats why Im here. I got a lot of good help from everyone with my 8n, and I look forward to learning about the 800. This unit starts great, runs great at lower rpm, but after it warms up it smokes grey and runs rough at higher rpms. This sure burns your eyes like diesel smoke. I cleaned the breather good and it still does it. Where do I go next? Thanks and have a Great Day

 

[old]

Gray??? If diesel it should be black if it smokes. May need to start with changing the fuel filters and see if that helps. Gray smoke says water or coolant in the system some place. 801 is the series by the way and the model will be 841 or 851 or 861 etc. Unless it has an SOS transmission it sound like you have an 861 since you said live PTO which would be a 5 speed transmission

 

[rabbit-1]

Thanks Old. I changed fuel filter this morning, and it helped some but still smoking. Haven't worked it yet just a few minutes at a time around the house. I dont mind rebuilding it, I just dont want to get ahead of myself if its a fuel related problem. Should I work it for a few hours and see what happens? Would it hurt anything? Thanks again and have a gooden...... Rabbit

 

[old]

Babying it may well be the problem. Diesels like to be run hard and put away wet as the old saying goes. Take it out and work it good and hard for an hour or 2 and I almost bet the smoke will go bye bye

 

[showcrop]

I have a 971d that I have used for raking hay for about eight years. after it is warmed up it makes very little smoke. lately I have had it on the kicker baler with wagon behind working hard, and it does make some black smoke when it is pulling hard. When I am on the road with the baler behind pushing the tractor down hill it makes white smoke. The engine is very low hours but the pump is high hours. The rough running at high speeds sounds like an injection pump problem to me.

 

[Larry NCKS]

My best bet: If it's been awhile since it's had one, it needs a new governor retainer ring and the pieces of the old one cleaned out of the pump. That is, unless it's been converted to the new style governor.

 

[rabbit-1]

Thanks show, thats what Larry is thinking. The guy at the junkyard says it could be out of time. It starts like a new one. Could timing be it? I have an extra pump thats been sitting for a while, but it should be good. Thanks and have a gooden

 

[Hal/Eastern WA]

You don"t want to rebuild it unless you HAVE TO, unless you enjoy wasting money.

Like Old wrote, the diesels tend to work better after they have been worked hard for a while. Diesels smoke some, and the exhaust always smells like diesel smoke to me. If that is not what you can accept, maybe a diesel is not a good fit for you.

Assuming the tractor has plenty of engine oil and also assuming that the oil pressure always stays above about 20 psi, I would find some job to challenge the tractor, like plowing or running a fair sized brush hog through tall weeds. After a couple of hours doing such a job, your diesel should have popped out any carbon buildup in the exhaust system and should run a whole lot better.

If during this hard work, the tractor gets a bunch hotter than you think it should, or if the oil pressure gets much below 20 psi, maybe you have a problem and maybe you should stop working it that hard.

Warning, when a diesel has been idled and babied for quite a while, there can be carbon buildup in the exhaust system, from partially burned fuel. When you work such a tractor hard, the carbon can come out in chunks that are red hot, and capable of causing a brush fire (this has actually happened to me several times!!!). So you need to plan for that possibility and be ready to put out any fire that occurs. For that reason, I like to plow after dark, so I can enjoy the free fireworks!

Something else a diesel can do when it is working hard is to slobber unburned fuel droplets through the exhaust. The droplets are messy, so you don"t want to wear clothing that you care a lot about. But my experience with a slobbering tractor has been that after running it hard a while, it tended to stop or at least slow down on the black rain. I suspect that working the injectors hard makes them seal better.

Anyhow, working a diesel hard is a reasonable step in deciding just what the tractor needs fixed. And a diesel is a heck of a lot more expensive to fix than a similar problem on its gas powered cousin. Good luck, hope it works out well for you.

 

[Larry NCKS]

If one is adept at mechanics, a kit which contains the troublesome governor retainer ring, the pump drive shaft seals (umbrella seals) and all other seals and gaskets for the pump can be had for around $30.00. The only special tool that may be required, depending on the style of advance stem the pump has, is a bristol bit. In its absense, a T-45 Torx bit can be ground down to do the task. The only other necessity is cleanliness.

Injectors do not seal better with work. Injectors deliver a set amount of fuel commensorate with engine RPM. Two things happen at low load to cause the slobber. Working the diesel engine alleviates both of these. They are: less than optimum operating temperature (which is likely the big culprit); and more fuel delivery than the engine needs to meet the power required of it.