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Oil consumption? For small diesel engine.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by bzinger, Mar 25, 2023.

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  1. Mar 25, 2023 #1
    bzinger

    bzinger Road Train Member

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    Engine is a kubota z482 in my apu , I have owned this since nearly new and it has been religiously serviced well before the recommended drain intervals .
    About a year ago it started using a small amount of oil like half a qaurt every 500 hours , this engine has 21000 hours on it so I wasn't concerned.
    So a couple months ago it just slowly stopped using any oil ..WHY ? ...I haven't changed oil brands or weights and the operating conditions are the same .
     
    bzinger, Mar 25, 2023
    bzinger, Mar 25, 2023
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    JoeyJunk Thanks this.
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  3. Mar 25, 2023 #2
    AModelCat

    AModelCat Road Train Member

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    Maybe you had a sticky piston ring that freed up?
     
    AModelCat, Mar 25, 2023
    AModelCat, Mar 25, 2023
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    Rideandrepair, Hammer166, stwik and 4 others Thank this.
  4. Mar 25, 2023 #3
    bzinger

    bzinger Road Train Member

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    Thats what I was thinking too ..thanks !
     
    bzinger, Mar 25, 2023
    bzinger, Mar 25, 2023
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  5. Mar 25, 2023 #4
    Magoo1968

    Magoo1968 Road Train Member

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    Does paper towel show a fuel ring if you drip some oil on it .. engine started sealing better or fuel is replacing oil burned .
     
    Magoo1968, Mar 25, 2023
    Magoo1968, Mar 25, 2023
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  7. Mar 25, 2023 #5
    bzinger

    bzinger Road Train Member

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    I've actually never checked it that way but I have oil samples pulled on it when I change the truck oil and they keep coming back clean .
     
    bzinger, Mar 25, 2023
    bzinger, Mar 25, 2023
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  8. Mar 25, 2023 #6
    bzinger

    bzinger Road Train Member

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    I will also add that i bought that unit with 7605 hours on the clock very cheap and know the 1st owner routinely ran well beyond the recommended 1000 hour drain intervals, I've never ran it over 800 hours without a drain.
     
    bzinger, Mar 25, 2023
    bzinger, Mar 25, 2023
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  9. Mar 26, 2023 #7
    Arctic_fox

    Arctic_fox Experienced mx13 execrator

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    If oil samples are good then its likely a sticky piston ring as others have said. I would also let it all settle for a while and check to ensure its not got water in it as well incase that is the issue. Unlikely with oil samples but hay better safe then sorry.

    Otherwise if the samples are clean just run it and keep checking for water and fuel. My guess is it ran harder then usual one night due to say slightly bad fuel, high elevation, extrme condtions whatever and got JUST hot enough to free stuff up or just worked itself loose.
     
    Arctic_fox, Mar 26, 2023
    Arctic_fox, Mar 26, 2023
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  10. Mar 26, 2023 #8
    wore out

    wore out Numbered Classic

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    #### Brad I forgot to send you the bill on that repair sure am glad you reminded me.



    I would think a ring stuck would use more oil than that. However that’s bout the only answer I can think of that would self heal.
     
    wore out, Mar 26, 2023
    wore out, Mar 26, 2023
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  11. Mar 26, 2023 #9
    bzinger

    bzinger Road Train Member

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    I appreciate the replies , it's really just a curiosity thing and half a qaurt over 500 hours isn't much , I've just never seen an engine go backwards on oil consumption without some help.
    With good maintenance these Kubotas are good to around 35000 hours so having paid 2500.00 for the unit it doesent owe me a dime .
     
    bzinger, Mar 26, 2023
    bzinger, Mar 26, 2023
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    JoeyJunk, wore out, Feedman and 3 others Thank this.
  12. Mar 26, 2023 #10
    Oxbow

    Oxbow Road Train Member

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    I wonder about how these engines get broken in.

    I bought a new 95 f 350 with the first powerstroke. It always used a bit of oil until I went to California and hauled a trailer back to Idaho. After pulling that 17 mile pull from Baker to Stateline on I 15, and really working the engine for the first time, oil consumption went away.

    I wonder how they seat the rings on these small engines?
     
    Oxbow, Mar 26, 2023
    Oxbow, Mar 26, 2023
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    JoeyJunk, Rideandrepair and bzinger Thank this.
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