I got a Diesel problem...
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  1. #1
    Join Date
    Jun 2007
    Posts
    196

    I got a Diesel problem...

    First I gotta say I sure don't know much about diesels...

    I have a Kubota tractor that started dropping one cly if not running
    under full throttle. Wide open it ran fine. Then it started dropping one
    cly until the engine warmed up. I was thinking it was an injector. So I
    bought one .... No help... Then it started whistling at me. I was thinking
    bowed head gasket and I thought it was blowing air out the radiator cap.
    So I took the head off... Gasket looked good. All I found was some detonation
    pits on the head. No water in the oil and no oil in the water... Any guess
    what might be my problem?

  2. #2
    Join Date
    Mar 2011
    Location
    Western Washington
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    3,839

    Re: I got a Diesel problem...

    Something with the injector pump????


    If you're a member of HEF heavyequipmentforums.com ping thepumpguy with the symptoms and he should know if this is a pump problem or something else... also post as much detailed info as possible ie.. model number size of engine, model numbers of pump,engine,etc...

  3. #3
    Join Date
    May 2008
    Location
    Orange, TX
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    Re: I got a Diesel problem...

    Can't offer anything on the "whistle" with the info provided but Kubota injector pumps do have a habit of their plunger springs breaking causing a dropped cylinder.
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  4. #4
    Join Date
    Mar 2017
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    bar stool
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    Re: I got a Diesel problem...

    Kevin, when did you last change the fuel filter?

    Have you got the creepin crud in the bottom of the fuel tank or black fuel?

    Did you feed it any bioDiesel?

  5. #5
    Join Date
    Mar 2005
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    Under a Rock
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    4,651

    Re: I got a Diesel problem...

    Not sure its the fuel but algea in the fuel will give you fits.

    Bio kleen works good to clean it out
    Also,Check out this forum
    They may help.

    http://www.orangetractortalks.com/forums/


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  6. #6
    Join Date
    Feb 2011
    Location
    CT
    Posts
    24

    Re: I got a Diesel problem...

    I've got an old Kubota and have first hand knowledge with some running problems.

    Bought tractor for pretty cheap. It ran like crap. Valve lash was waaay out, like 0.030 over spec on all three cylinders.

    Ran some Lubro-Moly Diesel purge through it and it would run really smooth.

    A year later I kept getting an intermittent miss. Changed out the injectors which helped, but was still running poorly. Went to change the fuel filter and when I dropped the bowl there was a big gob of algae on the inlet (tank side) of the fuel filter housing. Flipped open the petcock on the fuel filter and almost no fuel came out. Shot some air back up into the tank and it cleared out the blockage. Now everything runs like it should.

    That said, does your radiator have the whistle in the overflow tube?

    http://www.orangetractortalks.com/fo...ead.php?t=7447

    Best of luck.

  7. #7
    Join Date
    Mar 2005
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    I got a Diesel problem...

    Good call on the overflow...

    Kubota has a recall on newer tractor caps...

    I checked mine and indeed it was clogged. (with plastic flashing)
    Easily fixed with a twist drill and some common sense.
    but if you bring it to the dealer they will install a new cap for you.

    .





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  8. #8
    Join Date
    Jun 2007
    Posts
    196

    Re: I got a Diesel problem...

    I'll check the filter...
    The new head gasket made no difference. It does not even try to run on
    cly No. 2...I set all the valves.

  9. #9
    Join Date
    Dec 2013
    Location
    Mount Tabor VT
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    5,940

    Re: I got a Diesel problem...

    Compression test to rule out a valve, then look to fuel delivery.
    An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.

  10. #10
    Join Date
    May 2008
    Location
    Orange, TX
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    17,323

    Re: I got a Diesel problem...

    If you crack the injector line nut at the injector or pump end do you get a forceful spurt of fuel? If not, refer to post #3.

    You could also have a stuck needle in the injector tip and you can confirm/rule out an injector by switching cylinders with the #2 injector. If the miss follows the injector that's the problem. If not then refer to post #3.
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  11. #11
    Join Date
    Jul 2014
    Posts
    141

    Re: I got a Diesel problem...

    Seafoam. Copious amounts. It's cheap and worth a try. Has fixed a lot of fueling issues for me in the past.
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  12. #12
    Join Date
    May 2013
    Posts
    42

    Re: I got a Diesel problem...

    Quote Originally Posted by Willie B View Post
    Compression test to rule out a valve, then look to fuel delivery.
    What he said, check condition of motor could be broken ring, scored cylinder, head gasket etc.

  13. #13
    Join Date
    Jun 2007
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    196

    Re: I got a Diesel problem...

    I did everything I know how to do... Off to the diesel mechanic it goes...

  14. #14
    Join Date
    Jul 2013
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    402

    Re: I got a Diesel problem...

    Did they figure this out?

  15. #15
    Join Date
    Jun 2007
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    196

    Re: I got a Diesel problem...

    After about $1700.00 in parts and labor I got it back from the shop.
    I was a bad head. Cracked up inside the combustion chamber.
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  16. #16
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    Re: I got a Diesel problem...

    damn...

    well at least it's up and running again... any clue why that happened? any prior problems with those heads?

    besides the labor, thats not a terrible price.... too bad you didn't know that ahead of time.... swapping the head on those are a snap.
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  17. #17
    Join Date
    Jun 2007
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    196

    Re: I got a Diesel problem...

    Live and learn... Yea I could have done the head easy If I known the problem.
    The internet says this engine has had head problems just like what I had.
    I think the biggest problem is that this tractor has no heat gauge or heat light.
    I bought a digital 12 volt one that take a bolt on thermocouple. I'm thinking
    I'm going to bolt the thermocouple to one of the bolts next to the thermostat.
    Last few years I was running a 6 ft deck in high weeds in the heat of the summer.
    I know it was running a bit warm but it never popped the radiator cap.
    I will be watchen it a bit more now...
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  18. #18
    Join Date
    Jun 2016
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    by a resevior in north central ar.
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    Re: I got a Diesel problem...

    i had a b6200 4x4 and it worked wonders. after 2500 hours i sold and bought a b3200. those old b 5-8200 were great!
    lincoln 125sp
    monkey wards 250 ac/dc
    miller 211 w/spool gun
    ahp 200 sx tig
    lotos ltp5000d
    of course duramax diesel

  19. #19
    Join Date
    May 2017
    Location
    Pitman PA
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    288

    Re: I got a Diesel problem...

    Quote Originally Posted by kbeitz View Post
    Live and learn... Yea I could have done the head easy If I known the problem.
    The internet says this engine has had head problems just like what I had.
    I think the biggest problem is that this tractor has no heat gauge or heat light.
    I bought a digital 12 volt one that take a bolt on thermocouple. I'm thinking
    I'm going to bolt the thermocouple to one of the bolts next to the thermostat.
    Last few years I was running a 6 ft deck in high weeds in the heat of the summer.
    I know it was running a bit warm but it never popped the radiator cap.
    I will be watchen it a bit more now...

    Changing parts is the easy part of being a mechanic...figuring out whats wrong to get to the right part is the hard part

  20. #20
    Join Date
    Mar 2014
    Location
    NH
    Posts
    652

    Re: I got a Diesel problem...

    To pay $1700. at the dealer for parts and labor on a Kubota I think you did OK.

    Quote Originally Posted by gwoade View Post

    A year later I kept getting an intermittent miss. Changed out the injectors which helped, but was still running poorly. Went to change the fuel filter and when I dropped the bowl there was a big gob of algae on the inlet (tank side) of the fuel filter housing. Flipped open the petcock on the fuel filter and almost no fuel came out. Shot some air back up into the tank and it cleared out the blockage. Now everything runs like it should.
    I've been there with fuel quality problems; long ago developed algae in the fuel, had to clean the strainer every 6 hours. Used a variety of fuel additives with some results until an oldtimer told only BioBore or BioCleen or Biosomething would work... used it and it cleared up for a longtime. Recently had the situation return (with a different supplier) and this time steamed the tank, purged the lines, new filters, etc. oddly, it only occurred in that one machine. Keep that old tractor, new engines are NOT tolerant of fuel contamination at all.
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  21. #21
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    Mar 2005
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    Re: I got a Diesel problem...

    Quote Originally Posted by Popeye an old miner View Post
    Changing parts is the easy part of being a mechanic...figuring out whats wrong to get to the right part is the hard part
    Oh, Thats Easy...

    Just plug into OBD2 and check the code on the Google...
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