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  1. #1
    Join Date
    May 2001
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    Default Useful life of an engine?

    Here is the serial plate from a MAN engine which seems to state that the useful life of the engine is 5000hrs/10yrs



    First time I've seen anything like this. Anyone care to guess what it actually means? Is it 5000hrs or 10yrs or 5000hrs and 10yrs (the latter perhaps being more understandable I suppose)

  2. #2
    Join Date
    Jun 2006
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    711

    Default Re: Useful life of an engine?

    I think it means the useful life of the emissions certification is 5000 hours or 10 years,and after that the engine cannot be guaranteed to meet its certified emissions.

    I dont think it means the engine itself is not expected to last longer than 5000 hours or 10 years

  3. #3
    Join Date
    Oct 2003
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    west yorkshire
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    2,146

    Default Re: Useful life of an engine?

    I had something similar on my D9s. I believe the "useful life" refers to the time/hours that the manufacturer expects the engine to still comply with the relevant emissions regulation. After that time/hours if it was retested it may not pass the relevant emissions test.
    Interesting its 5000 hours on the MAN. It was 1000 hours on the volvo.

  4. #4
    Join Date
    Jan 2002
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    Aberdeenshire, Scotland
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    4,262

    Default Re: Useful life of an engine?

    Quote Originally Posted by julians View Post
    I think it means the useful life of the emissions certification is 5000 hours or 10 years,and after that the engine cannot be guaranteed to meet its certified emissions...............
    Let us add....

    "unless re-built to factory spec",......... in which case you will have another expected 5K hours ...
    Regards, Alf

    I've stopped drinking water .... I have seen what it does to the bottom of our boat!

    "The only time you have too much fuel is when you're on fire."

  5. #5
    Join Date
    Apr 2005
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    13,203

    Default Re: Useful life of an engine?

    Eek,

    23 years and 2,000 hours.
    1994 Ferretti 150 'Seralia'

  6. #6
    Join Date
    Apr 2011
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    Boat- SoF
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    2,913

    Default Re: Useful life of an engine?

    Page 9 —- here , not a tier 2 variant btw
    https://marinedieselbasics.com/wp-co...LE-301-403.pdf

    I,am not sure , look @ your owners hand book it should have an explanation what each number is on the makers plate .
    Obviously like to think it’s reffering to the tier 2 stuff , not the thing in its entirety .
    But ambiguity seems to run through En MAN. Literature .

  7. #7
    Join Date
    May 2001
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    Default Re: Useful life of an engine?

    Quote Originally Posted by julians View Post
    I think it means the useful life of the emissions certification is 5000 hours or 10 years,and after that the engine cannot be guaranteed to meet its certified emissions.
    Thanks. Didnt know that and its not something I've seen on industrial diesel engines. However not being able to meet emissions standards implies that the engine has deteriorated so what sort of deterioration are we talking about? Piston rings? Injectors? Fuel pump? Or worse?

  8. #8
    Join Date
    Nov 2001
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    Medway
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    17,598

    Default Re: Useful life of an engine?

    Seem to recall reading somewhere 10,000. hours on a Perkins M135.

  9. #9
    Join Date
    Jun 2006
    Posts
    711

    Default Re: Useful life of an engine?

    Im no expert,but im guessing its something to do with this below, and i think the useful life period is decided by the us government based on some sort of average use of the engine. It might well have no actual bearing on the wear of the engine at all.

    This below seems to relate to road going engines,but i guess the principle is the same for marine stuff.

    http://www.transportpolicy.net/stand...uty-emissions/

    Id guess its in the manufacturers interest to try and get as low a useful life figure as possible.
    Last edited by julians; 16-10-17 at 19:41.

  10. #10
    Join Date
    Dec 2009
    Posts
    246

    Default Re: Useful life of an engine?

    This is epa. It should be complient for this number of hours. Next step is 10 or 20 000 h. Epa demand a endurance test to document the emissions deviation a sertain persentage of useful life. So the engine maker needs to run an engine and measure emissions to see the drift. On a common rail it must be a nightmare. At least im told so by people doing this tests.

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