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Mtu 4000 series cylinder head problem.

Discussion in 'Engines' started by vic13r, Feb 11, 2020.

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  1. Oscarvan

    Oscarvan Senior Member

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    Just did a lot of Googling as that seemed odd to me and I can't find anywhere that has them made of cast iron..lots of high tech alloys....... very odd. And disappeared?

    Are you sure they were in there to begin with? :eek:
  2. vic13r

    vic13r New Member

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    Maybe I am wrong about the material of the seats,the sure is that are the same material as the heads as they are machined on the head and they are not a third party material pressed on the head
  3. d_meister

    d_meister Senior Member

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    Can you clarify if this was a complete new installation or if the new engines 2 years ago replaced existing engines of the same make/model?
    You say that the plant is a little tight and that there is no solution to that, so I wonder how intake air and exhaust are accommodated.
    Are the engines turbo or naturally aspirated?
    How is the use of each engine cycled into the group? For example, are there three groups of six that have a rotating duty, with some of the six coming on-line as demand increases? It's been 18,000 hours since the engines were installed, more or less, so how are they used?
    How is the failure discovered? As Capt J suggests; is it during maintenance inspections, or is there a sudden operability issue?
    How many heads of any engine are affected by the failure, and what position on the engines are they?
    Can all 16 on any engines all deteriorate at the same rate?
    How many engine hours before the failure?
  4. Oscarvan

    Oscarvan Senior Member

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    Generally valve seats are a much harder material pressed into the head.
  5. vic13r

    vic13r New Member

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    The engines are 2007 models,they are 65 liters quad turbo 16 cylinders with watercool intercooler.
    On 2017 all cylinder heads replaced with new ones from the factory and the job done by dealer.
    Today they have about 6500 hours to 7500 hours.
    They are working all together with the load depending the asking from the leaseholder.
    The problem is discovered when it's time for valve adjustment or we have serious damage on the heads.
  6. Capt J

    Capt J Senior Member

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    Usually 50 hertz generators run at 1500 rpms and 60 hertz run at 1800 rpms...…..perhaps the engines don't like the 1500 rpms......and would prefer more rpms?
  7. d_meister

    d_meister Senior Member

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    I seem to have misunderstood. I took it from the above that the engines were replaced 2 years ago. Pictures and a detailed time-line would be a great help.
  8. otomakan

    otomakan New Member

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    The seats are machined on the head not a separate piece. And what do you mean disappeared?
  9. vic13r

    vic13r New Member

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    I mean the seats are worn out,if I remember correctly that problem is about valve recession