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  1. #1
    Member
    Join Date
    Oct 2010
    Posts
    41
    Location
    SE Ohio
    Tractor
    Kubota MX5100, Massey 231

    Default New MX5100 smokes/coughs on startup

    Just took delivery of a new MX5100 this past week (thanks again to all who helped me to pick the tractor out). I'm having one curious issue which I thought I might ask opinions of here before calling my dealer back.

    I park the tractor outside, under cover, on a slightly unleveled surface. I find that, when I start the tractor cold, it coughs a bit (like it's missing), and smokes for about 5-10 seconds. The smoke clears soon after, and it runs fine from this point on. I feel like there may be either excess fuel (or oil?) burning off. Again, this only happens after sitting 24 hours. I can shut it off for lunch, and after sitting an hour or so, it starts just like my old Massey Ferguson 231 - without a hitch.

    I backed the tractor into it's parking spot this past evening, which leaves the exhaust a few inches higher (rather than a few lower) than the main engine block to see if it makes any difference.

    To be clear, we aren't talking about parking on a steep slope, just an uneven bit of ground - which cannot be leveled in case you are curious. Do I call the dealer, or does somebody here have an idea?

  2. #2
    Silver Member
    Join Date
    May 2008
    Posts
    237
    Location
    SW Washington
    Tractor
    L2550

    Default Re: New MX5100 smokes/coughs on startup

    Are you using the glow plugs for cold starts? What color is the smoke?

  3. #3
    Member
    Join Date
    Oct 2010
    Posts
    41
    Location
    SE Ohio
    Tractor
    Kubota MX5100, Massey 231

    Default

    Yep, using the glow plugs for 3-5 seconds. It's happened each of the 3 mornings I've started it, with the nights hitting mid 40s, and temps up to probably 55(?) by the time I started it. Smoke appears white.

  4. #4
    Platinum Member
    Join Date
    Jan 2011
    Posts
    573
    Location
    Richmond, IN
    Tractor
    Kubota MX5100

    Default

    That's pretty normal for these EPA friendly diesels with the injection timing retarded. The white or gray smoke indicates cool combustion temperatures.
    Kubota MX5100
    '95 Ram 2500 CTD
    Stihl MS441 ported
    Stihl MS280 ported

  5. #5
    Elite Member 4shorts's Avatar
    Join Date
    Jul 2008
    Posts
    3,179
    Location
    Bay Roberts, Newfoundland
    Tractor
    Big & Small one :)

    Default Re: New MX5100 smokes/coughs on startup

    Yep. Normal. Enjoy your tractor
    ...Excellence is not a skill. It is an attitude...

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  6. #6
    Veteran Member Code54's Avatar
    Join Date
    Aug 2005
    Posts
    1,696
    Location
    Putnam Co. West Virginia
    Tractor
    Kubota MX5100, Kubota BX25D, MULE Fxt Pro

    Default Re: New MX5100 smokes/coughs on startup

    I mostly heat my glow plugs for about 15-20 seconds and that seems to help a bit
    Kubota MX5100
    Kubota BX25D
    1985 Mule 500
    Mule FXT Pro

  7. #7
    Veteran Member MHarryE's Avatar
    Join Date
    Feb 2009
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    1,486
    Location
    Northeastern Minnesota
    Tractor
    JD 7720; Kubota M135GX, NH TS115A; JD 6230; Kubota L5740

    Default Re: New MX5100 smokes/coughs on startup

    Although your instrument panel is much different than mine, I assume it has a glow plug lamp. Turn the key to run until the light goes out, then start it. It should clear up more quickly although in colder temps it will still smoke and run a little rough for a bit. Mine is now in an unheated machine shed. It starts and runs even for a couple seconds, then runs rough as the glow plugs are cooled off by incoming air, then back to smooth running as it warms up. Nothing unusual. Indirect injection engines like Kubotas under 60 hp have a lot of combustion chamber surface area to heat up.
    JD7720; KubotaM135GX; NH TS115A; JD6230; KubotaL5740

  8. #8
    Silver Member Pharm's Avatar
    Join Date
    Sep 2012
    Posts
    109
    Location
    Middle Tn
    Tractor
    Kubota mx5100, MF 1080

    Default Re: New MX5100 smokes/coughs on startup

    Mine blows white smoke briefly on first start up of the day - no coughing though. I've not had to use the glow plugs yet. Smooth start every time so far.

  9. #9
    Platinum Member bucktaker's Avatar
    Join Date
    Apr 2010
    Posts
    838
    Location
    Sw Ohio
    Tractor
    Kubota L5740

    Default Re: New MX5100 smokes/coughs on startup

    Sounds Normal to me just like my L5740 Always a puff of smoke/stumble on first start more so the colder it is How does this tractor compare to the mf 231 you used before?
    Kubota L5740 La854
    MF 35 Deluxe gas wloader...For sale

  10. #10
    Veteran Member JJZ 109's Avatar
    Join Date
    Feb 2009
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    1,518
    Location
    Near Lake Ontario
    Tractor
    Bobcat S185 skid steer - Ferris IS500Z - JD GT235

    Default Re: New MX5100 smokes/coughs on startup

    When I had a B3030 I'd also glow it for a few seconds after the engine started. That would seem to take the roughness out of the initial start up.
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