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Vibration on 10V 1050hp Man engine

Discussion in 'Engines' started by Ringleader, Jan 21, 2011.

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  1. Ringleader, Jan 21, 2011
    #1
    Ringleader

    Ringleader Guest

    Looking for some probable causes and solutions for a vibration that I am experiencing on a Man 10V 1050hp diesel engine. My problem is that when the engine is in the warming up mode a vibration is felt in the 650 -900 RPM range and appears to decrease as the PRM is increased ... waiting for some feedback ASAP ... thanks ... Michael.
  2. Beau, Jan 21, 2011
    #2
    Beau

    Beau Senior Member

    Joined:
    Jan 15, 2010
    Messages:
    2,261
    Location:
    Beaufort, NC
    I have 1998 Man 820's 10cyl. Mine don't, but some can vibrate at low rpms because of the cylinder cut out feature. Below 1000rpm they run on about 5 cyclinders. Could that be the source?
  3. Capt J, Jan 21, 2011
    #3
    Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    14,434
    Location:
    Fort Lauderdale

    Every single pair I've run have vibrated at those speeds when cold and even when warm, expecially in SF's where you have large engines in a small boat, like a 50' SF I ran with them. The vibration decreases as engine speed increases because they only run on 1 bank of cylinders (left bank I believe) until they get to around 1000 rpms or so.

    But, needless to say, check all of your motormounts and such as well as harmonic balancer. Also, have they been maintained properly. Major things on MAN's are changing fuel injectors, adjusting valves (1000 hrs), and heat exchangers/aftercoolers. If the valves need adjusting they can run rougher when cold and run a little better when they warm up and the metals have expanded a little.