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  1. #1
    Bronze Member
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    Mar 2002
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    85
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    Lakeland, Fl
    Tractor
    MF 1428

    Default Bubbling around injector

    I opened the hood on my L245 today while she was running and found bubbles around the front injector. Going to tighten it tomorrow but can it be worse than a loose injector?

  2. #2
    Elite Member
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    Oct 2000
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    3,044
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    Windham County, Conn
    Tractor
    Ford 2120 , New Holland TN75D, Hitachi UH083LC Excavator

    Default Re: Bubbling around injector

    Sure, but I doubt it. I usually find mine leaking a week or two after I blead them. I tighten it while it is running so that I can see when it stops leaking.

    Andy


  3. #3
    Bronze Member
    Join Date
    Oct 2003
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    60
    Location
    Paso Robles, Ca
    Tractor
    Ford 9n/ IH Cub/ Case VAH/Husquavarna riding mower

    Default Re: Bubbling around injector

    If tightening it does not help, then you will need to change the seal (copper washer). But that is not that difficult of a job. Just remove line and return line then unscrew the injector. Clean off injector and clean out hole and replace washer. Then put it back together and bleed injector lines and thats it.

    (When removing the hard line from the injection pump, be sure to use a backup wrench to hold lower fitting)

    J.D.

  4. #4
    Platinum Member v8dave's Avatar
    Join Date
    May 2004
    Posts
    617
    Location
    Northern, Calif.
    Tractor
    Kubota 7610

    Default Re: Bubbling around injector

    Besides the danger of engine fans and belts, etc., if you decide to work on the injector/fuel system while the engine is running, please wear eye protection and leather gloves. Fuel injector systems run very high pressure and can inject fuel through your skin. This has the potential to be a fatal injury.

    A good way to check for fuel spray is to pass/wave a piece of cardboard all around the injector and lines. If it comes out dry, go ahead if you are so inclined. If it comes out streaked with spray--shut off the engine.

    Regards,

  5. #5
    Veteran Member
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    Jun 2004
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    1,368
    Location
    N.E. KY
    Tractor
    Century 3035

    Default Re: Bubbling around injector

    </font><font color="blue" class="small">( Sure, but I doubt it. I usually find mine leaking a week or two after I blead them. I tighten it while it is running so that I can see when it stops leaking.

    Andy

    )</font>

    I'm a diesel newbie so be warned, why would you be bleeding the injector lines?

  6. #6
    Platinum Member v8dave's Avatar
    Join Date
    May 2004
    Posts
    617
    Location
    Northern, Calif.
    Tractor
    Kubota 7610

    Default Re: Bubbling around injector

    </font><font color="blue" class="small">( I'm a diesel newbie so be warned, why would you be bleeding the injector lines? )</font>

    Two reasons come to mind. First is bleeding the air out after running out of diesel. Second is to bleed out water/fuel mixture from a bad batch of diesel.

    Some engines have a way to automatically bleed air after running out of diesel. My kubota isn't one of them.

  7. #7
    Platinum Member
    Join Date
    Nov 2003
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    800
    Location
    Winn Parish, LA
    Tractor
    Case 380B, Super C

    Default Re: Bubbling around injector

    The main thing to remember when bleeding fuel lines is bleed air from tank all the way to the pump. Fuel is the lube for pump, I've seen guys just crack line at injector and crank and crank and freeze pump plungers from lack of fuel. Once fuel pump is primed, the fuel is going to come out the injector. It just takes a little longer to compress air in lines to cause inj to open. I do always crack lines for tappet style inj that produce their own pressure, but they are on larger diesels.

  8. #8

    Join Date
    Apr 2001
    Posts
    23
    Location
    Vermont
    Tractor
    L3010HST

    Default Re: Bubbling around injector

    One other thing to keep in mind is that you do not want to wire brush the end of the injector. It will be somewhat carbon and that is best left alone. If you are concerned about the spray pattern then take it to a diesel pump shop and they will do whats called a pop off test on the injector. This is a gauge that tells them at what pressure the injector opens and they can see the spray pattern. All of the small holes on the spray tip are very critical to your fuel systems performance.

  9. #9
    Gold Member
    Join Date
    Jan 2002
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    305
    Location
    Northwest GA USA
    Tractor
    Kubota L3710DT & Yanmar 186D

    Default Re: Bubbling around injector

    Also, changing fuel filter may require bleeding fuel lines but I have found that you usually only have to bleed up to the injection pump and rarely ever the injector lines.

    Jeff

  10. #10
    Veteran Member 1bush2hog's Avatar
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    Jul 2003
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    1,086
    Location
    Georgia
    Tractor
    NH TN75

    Default Re: Bubbling around injector

    I just finished 50hr service on my tractor and had to blled injectors after changing fuel filter. I am a newbie too and understand from some of the pro's that this may not be necessary, but in my case it was the only way I could get tractor going again.

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