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  1. #1
    Veteran Member General Lee's Avatar
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    Kubota, L4400, BX1870

    Default Smoke from exhaust: what's normal?

    I understand a puff a black or dark smoke on start up is normal on diesels. Here is what I have been noticing on my tractor: I get a puff of smoke which is a real light white when I in crease the rpm's quickly. The puff dissipates quickly but when I drop rpm's and raise them again, the exhaust spits out the smoke. Kinda like if you were revving a motor with a gas pedal.

    Also the other night I was operating my tractor at night and could see a hint of exhaust smoke being illuminated from the tractors headlights. I was simply traveling down the road at about 2000 rpm. The smoke appeared to very light in color and I thought maybe it was visible because hot exhaust mixing the cool outside air? I'm not noticing smoke continually coming from the exhaust while operating, just when you goose the throttle or like I said at night with the headlights on. Tractor only has 36 hours on it. What do you all think? Normal diesel just being a diesel?
    Kubota L4400 - Land pride rear scraper blade, 6 foot landscape rake, 72'' Frontier Box Blade, Land Pride 60'' finish mower, Land Pride Q/A pallet forks, County Line Carryall built to haul and loaded R-1's
    Kubota RTV500
    Kubota BX1870

    Previous Tractors: 1978 B7100, 2009 B3200

  2. #2
    Veteran Member kuboman's Avatar
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    Canada
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    B3200, L5740,

    Default Re: Smoke from exhaust: what's normal?

    Quote Originally Posted by General Lee View Post
    I understand a puff a black or dark smoke on start up is normal on diesels. Here is what I have been noticing on my tractor: I get a puff of smoke which is a real light white when I in crease the rpm's quickly. The puff dissipates quickly but when I drop rpm's and raise them again, the exhaust spits out the smoke. Kinda like if you were revving a motor with a gas pedal.

    Also the other night I was operating my tractor at night and could see a hint of exhaust smoke being illuminated from the tractors headlights. I was simply traveling down the road at about 2000 rpm. The smoke appeared to very light in color and I thought maybe it was visible because hot exhaust mixing the cool outside air? I'm not noticing smoke continually coming from the exhaust while operating, just when you goose the throttle or like I said at night with the headlights on. Tractor only has 36 hours on it. What do you all think? Normal diesel just being a diesel?
    Sounds normal, are you sure it is smoke and not vapor?
    A cold engine will put out a blue/white smoke but once it is warmed up that should stop.
    L5740 LA854 loader
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  3. #3
    Elite Member
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    Feb 2002
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    western,pa.
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    Kioti DK 35

    Default Re: Smoke from exhaust: what's normal?

    I think your fine.
    Sounds normal to me, my tractors do the same thing.
    Vince,
    Kioti DK 35
    Hustler Super Z

  4. #4
    Elite Member whistlepig's Avatar
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    Preble County, Ohio
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    Kubota B7800 with FEL

    Default Re: Smoke from exhaust: what's normal?

    I don't know where you live but if it's in a cold climate a little puff of blue smoke on start up is a healthy sign for a diesel. Just a little unburned fuel. Among other things I take care of the shipping at work. The diesel trucks will smoke in real cold weather if not on fast idle. Diesels have to be hot to burn the fuel.
    I used to do the Hokey Pokey but I turned myself around.

  5. #5
    Veteran Member General Lee's Avatar
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    Default Re: Smoke from exhaust: what's normal?

    Quote Originally Posted by kuboman View Post
    Sounds normal, are you sure it is smoke and not vapor?
    A cold engine will put out a blue/white smoke but once it is warmed up that should stop.
    Vapor is what I could have been seeing passing in front of the headlights. I was getting the white puff when Goosin' the throttle. Engine was thoroughly warmed up, I just finished moving a tractor trailer load of asphalt millings.
    Kubota L4400 - Land pride rear scraper blade, 6 foot landscape rake, 72'' Frontier Box Blade, Land Pride 60'' finish mower, Land Pride Q/A pallet forks, County Line Carryall built to haul and loaded R-1's
    Kubota RTV500
    Kubota BX1870

    Previous Tractors: 1978 B7100, 2009 B3200

  6. #6
    Elite Member whistlepig's Avatar
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    Preble County, Ohio
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    Kubota B7800 with FEL

    Default Re: Smoke from exhaust: what's normal?

    What kind of temps are you operating the tractor at? There are no clues as to your location.
    I used to do the Hokey Pokey but I turned myself around.

  7. #7
    Veteran Member General Lee's Avatar
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    Default Re: Smoke from exhaust: what's normal?

    Quote Originally Posted by whistlepig View Post
    What kind of temps are you operating the tractor at? There are no clues as to your location.
    Mid Atlantic. Yesterdays temps were mild. 50ish and the night time stroll when I could see smoke (appeared thicker than vapor) was mid 40's. Faranhiet.
    Kubota L4400 - Land pride rear scraper blade, 6 foot landscape rake, 72'' Frontier Box Blade, Land Pride 60'' finish mower, Land Pride Q/A pallet forks, County Line Carryall built to haul and loaded R-1's
    Kubota RTV500
    Kubota BX1870

    Previous Tractors: 1978 B7100, 2009 B3200

  8. #8
    Gold Member
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    Dec 2011
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    468
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    nc PA.
    Tractor
    kubota b3200: kubota b7800: kubota rtv900

    Default Re: Smoke from exhaust: what's normal?

    i am not an expert but most all diesels i have seen and operated will put out some smoke right when they are rev'd up. i run dump trucks, front end loaders, backhoes, and my own kubota equipment. sounds normal to me.

  9. #9
    Super Star Member
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    Missouri
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    Kubota, John Deere, Case, Massey Ferguson, Ford

    Default Re: Smoke from exhaust: what's normal?

    Same as others, nothing unusual.
    Thread on helpful tractor abbreviations: http://www.tractorbynet.com/forums/o...-acronyms.html

  10. #10
    Super Star Member Thomas's Avatar
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    Lebanon,NH.
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    Kubota L2800HST w/Frontloader & CC LTX1046

    Default Re: Smoke from exhaust: what's normal?

    Working tractor at low rpm's can cause black smoke also build up..rolling along plus rev's 2000 rpms could loosen build up etc. what your seeing.

    How fresh diesel?

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