Go BottomHard to start Kubota
 | Richard Begin
Join Date: Posts: 1 
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2000-10-27 20955
27.5 hp 3 cylinder diesel engine. Takes approx. 10 seconds to start after complete cool down (over night). Glow plug indicator bright red after 20 to 30 seconds. Exhaust very dirty (black pungent smoke) for the first minute or so. Is all this normal? I've owned the tractor 1 month and It only has 700 hrs. Engine lube oil consumption 1 quart after 10 hours full throttle bush hogging. Seems to have plenty of power. This is my first diesel and I don't like that starter cranking for so long.
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| droz
Join Date: Posts: 1
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2000-10-28 20961
That sure doesn't sound normal. Assuming your glow plugs are working, the tractor should start in a few seconds. If it doesn't, it probably isn't preheated enough. The could explain the black smoke. Using a quart of oil in 10 hours sounds bad. It shouldn't use any oil. It also depends on the age of the tractor. My older Bobcat took 20 seconds minimum to preheat and always belched clouds of smoke for awhile. The newer Bobcat and Kubota and John Deere take no preheat (if warmer than 50 degrees) and the exhaust is clean. Since a diesel is a pretty simple engine you either have a glow plug problem of fuel injection problem or compression problem. There isn't much more. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2000-10-30 21027
Too bad, but I guess this is an ominous sounding note. I've never added engine oil to my 600-hour tractor between 100-hour changes--not even close.
You might want to do a compression check. A diesel with low compression doesn't heat up very well, and that could explain the smoking.
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2000-10-30 21029
If I had to guess, and with the info. you gave that's all this is, I would say that you have at least one fuel injector 'leaking down', that is the seal in the injector is not holding pressure and after shut-down the fuel leaks out into the cylinder. When you try to start it it cranks for a long time till the air is all bled back out and pressure builds back up, then it smokes like crazy on start-up because one cylinder is flooded. I am guessing that the smoke dissappears relatively quickly after start-up, or at least changes color to a light grey. If it is a newer style injection system with the engine oil powered injectors (like a Ford Power Stroke engine has) then the oil consumption means you have a VERY bad injector which is also pumping oil into the cylinder as you run it. Have an experienced technician (or injector shop) check all the injectors. Best of luck. ....
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| Bob Booher
Join Date: Posts: 1
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2000-10-30 21033
I know this is a tractor board, but bear with me. I had a Volkswagon Rabbit diesel that was hard to start when cool. Found a loose wire in the glow plug circuit. Tightened the terminal screw and it started like a champ. Stranger things have happened, you may want to inspect the wires in the glow plug circuit. ....
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2000-10-30 21040
Say Murf, I didn't know that Kubota was using those new style injectors....but then I don't keep up with Kubota as much as I should. Relying on you and Bird I think. I sure do like those injectors on the Ford Powerstroke and agree that this would explain everything that is wrong with Richard's tractor. Easy fix, too. Injectors are best removed and then taken to a diesel injector shop for testing. Removal is straightforward unless they are carboned up and then I'm told that it is a struggle to get them out. My experience has been better than that. ....
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