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Man CR900 how would rubber chunks get into my oil cooler

Discussion in 'Technical Discussion' started by CSkipR, May 1, 2018.

  1. CSkipR, May 1, 2018
    #1
    CSkipR

    CSkipR Member

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    Had the engine oil cooler removed to have the gasket replaced because of a slight oil leak. When they removed the oil cooler they found chunks of rubber inside that appear to have been a broken up round rubber gasket. Any idea how this would have traveled to the oil cooler and what it maybe. No other oil leaks.
  2. 30West, May 1, 2018
    #2
    30West

    30West Member

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    Round rubber gasket like an O-ring, or like a flat gasket? Was it on the water side or oil side?
  3. CSkipR, May 1, 2018
    #3
    CSkipR

    CSkipR Member

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    It looked like it was more a round flatter gasket possibly tapered. Not like an o-ring. Going to have to confirm today but pretty sure it was the water side.
  4. Capt J, May 1, 2018
    #4
    Capt J

    Capt J Senior Member

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    It might be the gasket on the end of the heat exchanger......do not quote me on this as I'm not that familiar with the insides of MAN's but I believe they have a rubber isolater gasket on each sides of the heat exchanger and that's how they get away without using any zincs in the raw water cooling system......
  5. CSkipR, May 1, 2018
    #5
    CSkipR

    CSkipR Member

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    Yes it was definitely the water side.
  6. motoryachtlover, May 1, 2018
    #6
    motoryachtlover

    motoryachtlover Senior Member

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    CSkipR are you done with Comachee Cove? I would like your thoughts on your experience there. If you would rather not post here, you could PM me. Hope all went well.
  7. CSkipR, May 1, 2018
    #7
    CSkipR

    CSkipR Member

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    I kind of think it might have been the thermostats that we replaced two years ago. Two of the three a portion of the rubber was missing and chewed up.
  8. CSkipR, May 1, 2018
    #8
    CSkipR

    CSkipR Member

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    Sent you a pm.
  9. Capt Ralph, May 1, 2018
    #9
    Capt Ralph

    Capt Ralph Senior Member

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    Is the usual tech still working on your MANs?
  10. CSkipR, May 1, 2018
    #10
    CSkipR

    CSkipR Member

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    No
  11. Capt Bill11, May 5, 2018
    #11
    Capt Bill11

    Capt Bill11 Senior Member

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    Is the cooler raw water cooled?

    If so, sounds like pieces of the raw water pump impeller to me.
  12. Capt Ralph, May 5, 2018
    #12
    Capt Ralph

    Capt Ralph Senior Member

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    Now that that slob is off of your boat, Clean all up and go boating with a smile.
  13. ychtcptn, May 6, 2018
    #13
    ychtcptn

    ychtcptn Senior Member

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    Raw water impeller pieces
  14. Pascal, May 6, 2018
    #14
    Pascal

    Pascal Senior Member

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    What's the raw water flow? If the oil cooler is before the heat exchanger, chances are you find impeller pieces a lazy mechanic (or captain) didn't bother looking for
  15. ranger58sb, May 7, 2018
    #15
    ranger58sb

    ranger58sb Senior member

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    Something useful to know about Comachee Cove?

    -Chris