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Blue smoke 2006 jd 240d

Discussion in 'Excavators' started by Erik corra, Jan 16, 2020.

  1. Erik corra

    Erik corra Member

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    We are looking at buying a 2006 John Deere 240d with 6000 hours on it. Very tight and clean machine. However it smokes blue on start up and for a good 5-10 min after depending on the temp outside (-15-+5 Celsius).None of our other hoes do this (Volvo & hitachi). Is this a common thing? Is it something to be concerned about? Reading online it says it can be many different things. Thanks in advance.
     
  2. Mbar

    Mbar Well-Known Member

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    What’s the shape of the air filter. Jd’s are bad about clogging air filters. May be worn turbo, valve guide seals. Does it start rite up or spin longer than normal
     
  3. Erik corra

    Erik corra Member

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    Fires right up. I’ve been hearing from a lot of ppl that the Deere motors are done at 6000 hours? What’s your opinion on that?
     
  4. Mbar

    Mbar Well-Known Member

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    I’ve built them at half that and I’ve seen them go way longer. All boils down to maintaince. I think the air filter setup on Deere’s is a weak point as we had to blow them out daily in the summer
     
  5. Welder Dave

    Welder Dave Senior Member

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    Reasonably maintained diesels are generally good for 10,000 hrs.+ unless it's a known problem engine like some of the Perkipillars.
     
  6. Erik corra

    Erik corra Member

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    This machine is from a pipeline maintenance company. from what they told us the machine had been over maintained. As it always needed to be ready to go at a moments notice.
     
  7. Welder Dave

    Welder Dave Senior Member

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    Wonder if it spent a lot of time idling? What's it like when it warms up and has been working hard for a couple hours?
     
  8. Erik corra

    Erik corra Member

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    They told me it had a lot of idle hours. Once it warms up there is no blue smoke. Gives the odd small puff of black if you bog it down.
     
  9. Mbar

    Mbar Well-Known Member

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    I worked for a pipeline company where I got my Deere experience. Those machines get the snot worked out of them. Most of the have high travel time on the under carriage and are always lifting against the reliefs
     
  10. terex herder

    terex herder Senior Member

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    A neighbor just tore down a 8.1L deere from a 850 dozer. 14,000 hours, I don't think the valve cover had ever been removed. Lots of blowby. Problem was 5 of the top rings were broken. Probably to much ether. I don't think think you have to worry nearly as much about the number of hours as you do the treatment during those hours.
     
  11. Erik corra

    Erik corra Member

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    Thanks for that.
     
  12. Welder Dave

    Welder Dave Senior Member

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    It could just be from excessive idling and needs to be worked hard. Keep track of oil consumption.
     
  13. Erik corra

    Erik corra Member

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    Thanks. I’ll keep an eye on that.
     
  14. Mobiltech

    Mobiltech Senior Member

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    Check the blowby. Could indicate bad rings. Usually blue smoke on a cold diesel is either low compression or a fuelling problem .
     
  15. Erik corra

    Erik corra Member

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    How would I check for blowby? Thanks
     
  16. terex herder

    terex herder Senior Member

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    Read the slobbery deere thread in the shop talk forum.
     
  17. joeblow

    joeblow Well-Known Member

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    Usually blue smoke on start up means a dribbly injector.Does it sound like it is missing a bit?
     
  18. Erik corra

    Erik corra Member

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    Runs smooth. Sounds a bit loud but every Deere we have looked at was loud imo
     
  19. mg2361

    mg2361 Senior Member

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    A little blue smoke (that would be oil) at start up usually indicates some worn rings, worn valve stem seals/valve guides or the wrong grade of oil. Even oil that is thinned out from possible fuel contamination (leaking injectors which could also wash down the cylinders). Did you do an oil sample? When cold the ring's could "unseat" slightly due to deposits in the ring grooves plus glazed cylinder liners. When things warm up the rings seat again solving the issue (temporarily). With valve seals they might be getting a little brittle and when cold allow oil to get into the cylinder. Again when it warms up they seal stopping the cause of the smoke. It could be the turbo, but a turbocharger tends to allow oil in all the time (usually). But it doesn't hurt to remove the inlet and outlet from the turbo to look for oil (it doesn't cost anything but your time to inspect that).

    The hose that runs off the valve cover and sticks out the bottom of the machine below the engine. Does it huff and puff like an old steam engine train or does it just barely have anything visual coming out?

    If it is loud is it the fan running at full speed all the time?
     
  20. Erik corra

    Erik corra Member

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    Thank you for the information. I find it hard to believe the rings or valves could be worn out at 6k hours. Seems early to me. But I’m not Deere guy I’ve only owned one other Deere and it had a yanmmar in it.

    I’ll check the blowby this week. We are going to take another look at it as the temps will be warmer. They also told us that the fuel filters needed to be replaced ave that it had “summer” fuel in it. They are replacing the filters and putting “winter” fuel in it. Not sure if either of those two things would cause it to smoke blue?