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  1. #21
    Member
    Join Date
    Oct 2010
    Posts
    41
    Location
    SE Ohio
    Tractor
    Kubota MX5100, Massey 231

    Default Re: If it were a gas engine, I'd say with confidence that the engine was flooded

    Quote Originally Posted by bucktaker View Post
    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?
    I hope so, although it's had me a bit worried. Like one other poster here noted, if something is amiss, I'd like to address it during the warranty period. Again, it's not a puff of smoke, it's steady smoke for between 5-10 seconds. Rough coughing/missing for the same period. If it were a gas engine, I'd say with confidence that the engine was flooded.

    The MF231 on the other hand, starts much more smoothly, and is running fine in a second or two.

  2. #22
    Member
    Join Date
    Oct 2010
    Posts
    41
    Location
    SE Ohio
    Tractor
    Kubota MX5100, Massey 231

    Default Re: New MX5100 smokes/coughs on startup

    Quote Originally Posted by Ken45101 View Post
    This discussion has me thinking. My skid steer does exactly as described and in cold weather it can take 30 seconds to smooth out and stop smoking. It's done it since it was new. My son (who is a shop foreman at a different dealer) thought it was probably the injectors leaking while it is shut off and allowing fuel into the cylinder. I should have done something about it while it was under warranty but I procrastinated since it wasn't too bad in normal weather. Now I'm beginning to wonder if the glow plug isn't working correctly.

    Ken
    Yep Ken, like your son, I'd kind of wondered if fuel might be leaking into a cylinder/cylinders. It starts quickly, but as I'd posted earlier, it almost seems as if the engine were flooded. If it were a gasoline engine, I'd say with confidence that the engine was exhibiting signs of being flooded.

    As for the glow plugs, am I correct in thinking that these are unnecessary when the temperature is warm - say in the 50F or above? I believe I've read my owners manual correctly.

  3. #23
    Veteran Member Code54's Avatar
    Join Date
    Aug 2005
    Posts
    1,812
    Location
    Putnam Co. West Virginia
    Tractor
    Kubota MX5100, Kubota BX25D, MULE Fxt Pro, Honda Pioneer 500

    Default Re: New MX5100 smokes/coughs on startup

    I think I would just run it in to the dealer and get it looked at when you have a little time you can do without it. Maybe worth it, hate to see something go wrong in the future that could have been prevented and paid for while under warranty.
    Kubota MX5100
    Kubota BX25D
    Mule FXT Pro
    Honda Pioneer 500

  4. #24
    Veteran Member
    Join Date
    Jan 2012
    Posts
    1,854
    Location
    Success Missouri
    Tractor
    Kubota L3800DT, L3750DT Shuttle

    Default Re: New MX5100 smokes/coughs on startup

    My newish L3800 starts smooth and with no smoke every time. And I don't use the glow plugs unless it's below 40f, but do throttle it up a little . I'd have your dealer check it out.
    Don
    Kubota L3750 Hydro Shuttle, 4wd, FEL; L3800 Gear drive, 4wd, FEL
    Husqvarna XP chainsaws 346xp X3, 357xp, 562xp, 359

  5. #25
    Veteran Member MHarryE's Avatar
    Join Date
    Feb 2009
    Posts
    1,616
    Location
    Northeastern Minnesota
    Tractor
    JD 7720; Kubota M135GX, NH TS115A; JD 6230; Kubota L5740

    Default

    Does everyone but me live in warm weather year around? I have started 3 diesels today, 24 degrees this morning, and all of them required glow plugs, stumbled for a few seconds after starting, smoked quite a bit, and then ran like normal once the cylinder walls, manifold, etc., got warmed up. To get a cleaner start in the colder temps you need a direct injected FADEC system.
    JD7720; KubotaM135GX; NH TS115A; JD6230; KubotaL5740

  6. #26
    Platinum Member
    Join Date
    Apr 2004
    Posts
    663
    Location
    Quebec
    Tractor
    Kubota MX 5000

    Default Re: New MX5100 smokes/coughs on startup

    Quote Originally Posted by MHarryE View Post
    I have started 3 diesels today, 24 degrees this morning, and all of them required glow plugs, .
    What do you mean by required? Like they wouldnt start without the plugs?

    My 2005 MX5000 starts fine at 24F with no pre-heat. I even started it cold down to 10F once out of curiosity. 20F is my normal cut-off point on using the glow plugs.

  7. #27
    Platinum Member Buckgnarly's Avatar
    Join Date
    May 2012
    Posts
    529
    Location
    West topsham VT
    Tractor
    Kioti DS3510

    Default Re: New MX5100 smokes/coughs on startup

    Why would you not use the glowplugs? Other than wearing them out, why not help the engine start easier?
    I got the same "why do you need a block heater" from the dealer....sure the tractor will start at 0F, but it sure is easier on it after running the block heater for a few hours.

  8. #28
    Platinum Member
    Join Date
    Apr 2004
    Posts
    663
    Location
    Quebec
    Tractor
    Kubota MX 5000

    Default Re: New MX5100 smokes/coughs on startup

    But I do use them ,from 20f down and the block when it dips to 0f

    That thing is babied

  9. #29
    Platinum Member bucktaker's Avatar
    Join Date
    Apr 2010
    Posts
    870
    Location
    Sw Ohio
    Tractor
    Kubota L5740

    Default Re: New MX5100 smokes/coughs on startup

    to see if your glow plugs are having an effect Turn the key and start with no delay, note your smoke and cough..... next day similar temp cycle your glow plugs twice to see if it starts the same. I'm betting its normal for this type tractor. good Luck
    Kubota L5740 La854
    MF 35 Deluxe gas wloader...For sale

  10. #30
    Gold Member FatTire's Avatar
    Join Date
    Oct 2007
    Posts
    423
    Location
    Colorado
    Tractor
    Kubota MX5100, Unimog 404 w/ snowblower, Deere UTV w/plow

    Default Re: New MX5100 smokes/coughs on startup

    I did that test. Yesterday with temp in the 30's and no glow plug, there was a quite a bit of smoke and coughing for about 5 seconds before it started running smoothly. With glow plugs today (also in the 30's) for 20 seconds there was an initial puff of smoke but it started without any hesitation. I don't see any reason not to use the glow plugs.

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