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  1. #1
    Silver Member
    Join Date
    Sep 2014
    Posts
    129
    Location
    Marbletown NY
    Tractor
    Kubota B21

    Default B21 oil level rising?

    Went to start B21 this morning. Engine oil was over the full mark by about half the distance from "full to add". Seems I recall last time I ran it it was a bit above also.

    I recall on Peugeot 504 diesels, at least with the non bosch fuel pump, this meant the front seal was leaking fuel down into the crankcase. Wondering if the same may be possible here?

    I am going to drain and refill, as I don't want to chance running it on diluted oil, then see what happens from there. I don't run it that often, so may well forget that plan. I know on the Peugeot, I ran for quite a while, thinking how fortunate I was it had stopped using oil. Ah, what bliss is ignorance . . . When it began "gaining" oil, I became concerned.

  2. #2
    Elite Member CobyRupert's Avatar
    Join Date
    Oct 2012
    Posts
    3,245
    Location
    Washington County, NY
    Tractor
    JD 5075E

    Default Re: B21 oil level rising?

    Do you tend to stop and start it often, running it only for short durations so that it never comes up to temp?
    JD5075E, Frontier RC2084 Rotary Cutter, Wallenstein FX65 Skidding Winch

  3. #3
    Silver Member
    Join Date
    Sep 2014
    Posts
    129
    Location
    Marbletown NY
    Tractor
    Kubota B21

    Default Re: B21 oil level rising?

    Quote Originally Posted by CobyRupert View Post
    Do you tend to stop and start it often, running it only for short durations so that it never comes up to temp?
    Varies with what I am doing. As far as it "getting up to temp" goes, it never really seems to get hot according to the gage and I've been told that's normal. I have changed the thermostat with a kubota item.

  4. #4
    Super Star Member Gary Fowler's Avatar
    Join Date
    Jun 2008
    Posts
    10,639
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: B21 oil level rising?

    Gaining oil in the engine crankcase can come from the injection pump or the hydraulic oil pump either of which can blow the back seal and leak diesel or oil into the engine crankcase. The smell test might be the best way to determine which is leaking.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  5. #5
    Silver Member
    Join Date
    Sep 2014
    Posts
    129
    Location
    Marbletown NY
    Tractor
    Kubota B21

    Default Re: B21 oil level rising?

    Quote Originally Posted by Gary Fowler View Post
    Gaining oil in the engine crankcase can come from the injection pump or the hydraulic oil pump either of which can blow the back seal and leak diesel or oil into the engine crankcase. The smell test might be the best way to determine which is leaking.
    I don't really smell anything definite. I think an oil and filter change can't hurt, then I will monitor it closely. I doubt I overfilled it last time, but maybe. Delo 400 is on the self locally, so I may use that.

  6. #6
    Silver Member
    Join Date
    Sep 2014
    Posts
    129
    Location
    Marbletown NY
    Tractor
    Kubota B21

    Default Re: B21 oil level rising?

    Quote Originally Posted by joea99 View Post
    I don't really smell anything definite. I think an oil and filter change can't hurt, then I will monitor it closely. I doubt I overfilled it last time, but maybe. Delo 400 is on the self locally, so I may use that.
    So I ended up doing oil and filter, Rotella 10w 30. The Hydraulic fluid was low, so topped that off. I'll keep an eye on it.

    How much of a hassle is pulling the pump?

  7. #7
    Silver Member
    Join Date
    Aug 2015
    Posts
    237
    Location
    ɹǝpunuʍop
    Tractor
    Kubota B21TLB (B21, TL421, BT751) Toyota SDK4, T116 Bobcat

    Default Re: B21 oil level rising?

    1. Open the bonnet.
    2. Disconnect the accelerator rod
    3. Remove the fuel cut off solenoid
    4. Remove the fuel filter bracket (6) mounting screws.
    5. Disconnect the delivery pipes (2) to the flow priority valve and remove the flow priority valve.
    6. Disconnect the suction hose (7) and remove the hydraulic pump

  8. #8
    Silver Member
    Join Date
    Sep 2014
    Posts
    129
    Location
    Marbletown NY
    Tractor
    Kubota B21

    Default Re: B21 oil level rising?

    Quote Originally Posted by 100 td View Post
    1. Open the bonnet.
    2. Disconnect the accelerator rod
    3. Remove the fuel cut off solenoid
    4. Remove the fuel filter bracket (6) mounting screws.
    5. Disconnect the delivery pipes (2) to the flow priority valve and remove the flow priority valve.
    6. Disconnect the suction hose (7) and remove the hydraulic pump

    g'day. That's for the fuel (injector) pump, yes? I was wondering about the pump for the drive and implements. The suggestion is that is what
    may be leaking into the crankcase, tho I have yet to prove it out.
    Last edited by joea99; 11-04-2017 at 07:04 PM.

  9. #9
    Silver Member
    Join Date
    Aug 2015
    Posts
    237
    Location
    ɹǝpunuʍop
    Tractor
    Kubota B21TLB (B21, TL421, BT751) Toyota SDK4, T116 Bobcat

    Default Re: B21 oil level rising?

    Quote Originally Posted by joea99 View Post
    How much of a hassle is pulling the pump?
    1. Open the bonnet.
    2. Disconnect the accelerator rod
    3. Remove the fuel cut off solenoid
    4. Remove the fuel filter bracket mounting screws.
    5. Disconnect the delivery pipes to the flow priority valve and remove the flow priority valve.
    6. Disconnect the suction hose and remove the hydraulic pump
    Quote Originally Posted by joea99
    That's for the fuel (injector) pump, yes?
    No, the hydraulic pump
    Straight from the manual
    Last edited by 100 td; 11-04-2017 at 08:00 PM.

  10. #10
    Silver Member
    Join Date
    Aug 2015
    Posts
    237
    Location
    ɹǝpunuʍop
    Tractor
    Kubota B21TLB (B21, TL421, BT751) Toyota SDK4, T116 Bobcat

    Default Re: B21 oil level rising?

    You need to remove the fuel filter, rod and solenoid to get access for the rest, just have a look at the right side of engine and you will work it out.

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