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Kubota B6000E Smokie Exhaust

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Steve Mahler
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2002-04-12          37319


I have a late 70s B6000E in mint condition that seems to always run a little smokey. Under normal conditions you cannot see the blue tint to the exhaust, but on a sunny afternoon it is quite visible. The machine runs great, and I am told by the previous owner that the injectors are only a year or two old. Is this normal for an older diesel?



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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-04-12          37324


Diesels can make white, black and gray smoke as well as blue. Each colour may indicate a different type problem. Blue is oil, which might be expected on a high hour engine. However, an engine can run years burning a bit of oil. One solution is just wait for the compression to get so low that it becomes hard to start.

A bit of gray exhaust that puffs during acceleration and warm up is fairly normal. My 600-hour tractor doesn't have blue exhaust. However, diesels like to run hard, and mine will start puffing more gray exhaust if it's been doing a lot of chugging around loader work. It used to puff a fair bit before I found that the thermostat was stuck partially open. The engine wasn't coming up to operating temperature under most workloads. Diesels also may cool down below operating temperature if idled at low rpm’s for extended periods. Then they start smoking. For that matter, they don’t warm up at low rpm no matter how long the warm-up.

Setting the valve clearances further reduced the puffing. These things are prety easy to check and adjust, and they will make a diesel smoke if they're out of adjustment. An injector spill time adjustment also could be performed but the procedure is more complex.

....


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Steve Mahler
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2002-04-18          37595


Now that Spring has arrived with a heat wave, I spent 3 solid hours mowing at high RPM, and the smoking seems to have stopped. Is it possible that I am running around a low RPM too much, never letting it warm fully and burn off carbon? The little diesel has so much torque down low that I never even approach half throttle for pulling a wagon, pushing snow, etc. Maybe I need to throttle up once and a while? ....


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Murf
Join Date: Dec 1999
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2002-04-18          37598


Steve, I think you hit the nail on the head, as my friend (neighbour?) TomG put it, they like to work, not just idle around. I would suggest that "mint" also probably means 'really low hours' and 'never really worked hard'. The other aspect is that if indeed you don't put much time on the little beast the fuel is probably not fresh, and the rings may be a little sticky. IMHO, I would add a generous amount of top-quality fuel additive and find an excuse to give it a good run now & then (tell your wife I said so). Best of luck. ....


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Morgan
Join Date: Jul 2003
Posts: 126 Albany, NY
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2002-04-18          37605


I have a B6200 similar to B6000E and I always run it a full engine speed. It torques the implements better and gives the hydraulics the pull pressure. To adjust speed I just change gears.

Also starts better at full throttle. I always keep it set on full rabbit and no turtle. (Except when I get off the tractor to move a rock, etc.) ....


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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-04-19          37619


Glad a bit of a run seemed to fix it up. I think of operating temperature and load as more important than just high RPM, but maybe somebody knows for sure. However, all these factors tend to overlap anyway.

Almost all of diesels puff a bit on acceleration even when warm, but I know mine almost completely stops puffing for several weeks following my ten mile road trips to our camp. I keep the RPM near max, and my 650-lbs. forklift and loader I carry plus some sizable hills give the engine a pretty good run. I suppose plowing or rotary cutting would be better runs.

I'm not sure that full throttle gives the highest torque on many engines. I'd guess that engineers would tend to peak up the torque around PTO RPM, but then there's often not a low of difference between the max no-load rpm adjustment and PTO RPM. Fairly high throttle settings do help starts--especially in cold weather. It's sort of like a diesel choke--more fuel instead of less air. What the higher throttle positions do is keep the governor from reducing the fuel supply as soon as the engine catches and starts gaining rpm's.
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DRankin
Join Date: Jan 2000
Posts: 5116 Northern Nevada
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2002-04-19          37641


Check the link below. I am really impressed with this stuff. I get mine from the local NAPA auto part store, but it is also available online. It cut the smoke output on my engine by 95 percent, makes starting much easier and made the engine so much quieter that I can hear the valve train now. ....


Link:   

Click Here


 

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Morgan Wright
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2002-04-19          37654


Steve, your smoking came from incomplete combustion of diesel fuel. Maybe there were carbon deposits in the valves or something, but they have burned through now. Sounds like promblem is solved.

I'm interested in learning about the B6000E, you say it's from the 1970's when Kubota first started selling tractors over here. How big is the engine (in cc's, it should be marked on the tractor). My B-6200 is a little 3 cylinder job with 855 cc's. It falls midway in size between the modern B-7500 (1001 cc's) and the B-7400 (741 cc's) ....


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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-04-20          37667


Thanks for the link Mark. I saved it to rear later. I'll try to compare the product to what I use, but mine also has anti-gel. The shrinking seal issue might be important to think about. ....


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Steve Mahler
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2002-04-30          37972


My B6000E is a 2cyl, 12.5hp with 6F 2R manual; 2WD. The original owner ordered it new with the 48" Woods belly mower and 42" Kubota (woods designed) tiller. He had a john deere 214 with a snowblower so never used the machine in the winter, stored in a heated garage/shop etc. The deere died, he bought a new BX with a snowblower, and sold me the mint little B6000E. I was looking for something larger, but the price was right and the condition hard to pass on. I have added a back blade, dirt scoop, and boom pole to round out it's duties on my 40 acres of trails and fields. I will look at the plate and post the exact displacement. Nice little rig that I will probably keep even after purchasing a more appropriate (deere 790 or L-series kubota) tractor. ....


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D Wilburn
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2002-05-03          38100


I have a B6000, 4WD, with a front-end loader. It also smokes heavily (blue/gray smoke). Also, the engine lugs in 3rd gear going up hill. Dirty fuel injectors? The Red Line fuel additive described above sounds interesting. I'm going to take off the injectors this weekend and have a look at them. I'll also check the oil bath air cleaner for blockage. How do I check the compression? I believe the cylinders should pump up to more than 400 psi. Is there a special pressure gauge with fitting that I attach to the fuel injector port?

I also have a b6000E (2WD) that overheats. When I first start the engine, the oil pressure is 55 psi. After mowing the grass for an hour, the oil pressure drops to less than 10 psi. This is usually accompanied by steam/antifreeze spitting out of the overflow tube from the radiator. The radiator was re-cored recently and the system flushed (it was really dirty). The radiator trash screen does become clogged quickly from grass/leaf debris and I blow it off with compressed air. I shouldn't have to stop mowing every half hour to clear the radiator screen. Any suggestions?

Lastly, I'm looking for a tiller for my tractor. You probably all know that the B6000 has a non-standrad counter-clockwise PTO that is 10 spline and smaller diameter. I bought two adapters from Hub City that makes the PTO shaft the stanadrd 1 3/8", 6 spline, but the rotation direction is still an obstacle. People have suggested using a standard tiller and runing it backwards, turning around the tines, or reversing the gearbox. I'd really rather have an OEM tiller. I've looked everywhere and can't find one. Any suggestions? I have a 36" bush hog that I'd sell or trade. It is made for the B6000 (correct PTO direction and spline size).
I can be reached at daniel.wilburn@sealedair.com
or at (864) 433-2944 in Spartanburg, SC.
Thanks,
Dan ....


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DRankin
Join Date: Jan 2000
Posts: 5116 Northern Nevada
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2002-05-03          38106


I have the notion that injectors are the most sensitive part of the system and just handling them improperly can damage them. Maybe I have that part wrong, but if there is any part that I would want a very experienced person to work on it would be injectors. And maybe you have that experience. If it were my engine I would try to clean up the system with a high quality fuel additive first. My $.02, for what it's worth. Could be a $5.00 fix instead of a $500.00 headache. ....


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DH83
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2002-05-04          38154


HERE ARE SOME QUICK RULES FOR DIESEL SMOKE
WHITE SMOKE IS UNBURNT FUEL(cold winter start up)
BLUE SMOKE IS OIL GETTING INTO THE COMBUSTION CHAMBER
BLACK OR GREY SMOKE IS BURNT FUEL WITH THE LACK OF AIR
(dirty air filter,worn injector tip holes overfueling
the engine,late injector pump timing,injector pump
out of calibration,worn geartrain to injector pump)
I WOULD ALSO CHECK THAT THE ENGINE IS RUNNING AT LEAST
180 DEGREES F.IF THE ENGINE IS USING OIL AND BLOW BY
LOOKS EXCESSIVE GET THE CHECK BOOK OUT.GOOD LUCK ....


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TomG
Join Date: Feb 2002
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2002-05-05          38158


Dan: That's a bundle of problems, and a little difficult to sort out in one bite. My repair manual gives a slightly different take on exhaust smoke colour an problems than DH's, but that's basically the idea.

I'd ensure that the right oil for the tractor is used and the level is right. I'd change the fuel and air filter if there's any doubt about their condition, and check for fuel line and intake manifold obstructions as well. If the tractor sat for awhile, I'd change the oil and drain the fuel tank too, and I'd probably use fuel and oil additives for awhile. Red line is mentioned as well as Marvel Mystery Oil (or something like that). Finally I'd check that the engine was coming up to operating temperature, and I might check the valve clearances.

When warm, diesels puff a bit on acceleration. If heavier exhaust smoke persists then other causes of smoking need to be checked. Compression testing a diesel does require a special gauge and fitting. I can't say if a compression test for the tractor would use an injector or a pre-heater port, but one of them has to be removed. Faulty injectors or bad timing certainly can cause exhaust smoke, but it's generally better to check alternative causes that don’t require tear-down first.

Regarding the 6000e: Off the top of my head, the problem may be a bad head gasket or cracked head. It could be something else like a bad water pump, loose belt and any number of other causes. One thing for certain though, running an engine on 10-lbs. oil pressure isn't good. What ever is the cause, it needs some immediate attention.
....


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Steve Mahler
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2002-05-06          38201


This has become a fun string for an antique bota owner. First, I would love to buy the mentioned 36" brush hog, but I dont want to give up my tiller. Plus I live in northern NY...as for the tiller, you will have a hard time finding one for sale. I wouldnt advise running a tiller backwards - they are chain driven, and the spring loaded tensioner will not last long if pushed the wrong direction. As for the bota with the overheating problem, these machines use the thermo-syphon cooling system - no water pump. Be very careful that the antifreeze/water mix is correct. Check manual, I dont remember. It is a very simple system, so if the fluid is fresh and correct, and you are overheating - there is blockage somewhere. My dust screen gets coated when mowing with no problems. Hope I have helped. I forgot to look up the displacement - it is not on the plate anyhow; I think the official name of the engine is ZL60. I would post pics but I dont have a website. ....


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D Wilburn
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2002-05-08          38307


Thank you all for the comments on the smoking and overheating problems with my Kubota B6000 tractors.
I fixed the smoking problem by cleaning the air filter (oil bath type). It was clogged up good. This made a tremendous difference. It doesn't smoke at all now.
Concerning the overheating, I found that there was dirt clogging the radiator fins. I haven't run the tractor hard since cleaning the radiator, but I'll test it this weekend.
By the way, the 2 cylinder engine in a B6000 is a ZL600.
Thanks,
Dan ....


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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-05-08          38339


Good to hear that most things seem straightened out without a lot of aggravation. It's particularly good to hear that my head gasket idea wasn't it.

The idea did bring something to mind though. When I hear of coolant being expelled out the cooling system I automatically start thinking head gasket. However, checking or replacing the rad cap might be a good idea if coolant was being expelled and the gauge or light wasn't indicating a hot engine. A weak cap that doesn't hold pressure will let coolant boil at normal engine temperatures. Of course, oil pressure dropping to 10-lbs. does suggest a hot engine, and maybe light oil. It might be good to check further if a gauge or light doesn’t indicated a hot engine.

I forgot about the thermo-siphon systems--no water pump, belt etc. I hear they work OK though. Rads can clog in surprisingly short times in dusty conditions like hogging. I don't know if the rad is covered with a screen, which I think makes cleaning a bit easier. My 1710 rad is covered by a screen, and I blow it off and also the fins from behind every ten hours or so. Few of my operations are very dusty.
....


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billtreat
Join Date: Oct 2011
Posts: 21 los alamos calif
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2011-10-02          180667


i have an L3410 kubota run it at 3500rpm all the time. 550 hrs.,no smoke. have

many implements. ....


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kthompson
Join Date: Oct 2005
Posts: 5275 South Carolina
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2011-10-03          180677


Bill very glad to have you here and like the way you are chiming in. No idea if you are aware the date something is posted is just above the name of the poster. Don't let that stop you from hitting old threads though for have seen people come back and make comments following such. Again keep chiming in.

You will find some very fine people here but we like to know implements??? pictures...tell us more. ....


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