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Yanmar 6CXM-GTE2 in 05 48 OA

Discussion in 'Engines' started by Rusty Mayes, Feb 1, 2021.

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  1. Rusty Mayes, Feb 1, 2021
    #1
    Rusty Mayes

    Rusty Mayes Member

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    Sep 5, 2019
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    Location:
    Sanfransico Bay area
    A buddy is considering moving from a SeaRay 420 to a 48 Ocean Alexander with 500 hp Yanmars. He has Cummins 480 CEs on his 04 420 and actually dropped a valve seat at 700 hrs... Ouch! I saw a thread on the Yanmar 440s about serious valve issues. Does anyone know if the problem is limited to the 440 HP engines?
    Cummins had big issues with the 480CE and corrected when they went to the 500QSC later.
    Thanks
  2. Esuomm1, Feb 2, 2021
    #2
    Esuomm1

    Esuomm1 New Member

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    Brielle, NJ (Manasquan)
    I think the 6CXM's are rock solid, apart from their cooling system (dissimilar metals, or something like that), which might require more attention than otherwise over the years. A google search will shed some light there.

    They don't have that valve issue you mention for the 440's.

    Good luck
  3. Rusty Mayes, Feb 2, 2021
    #3
    Rusty Mayes

    Rusty Mayes Member

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    Location:
    Sanfransico Bay area
    That is encouraging. Thanks
  4. Trinimax, Feb 3, 2021
    #4
    Trinimax

    Trinimax Senior Member

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    Trinidad and Tobago Yacht club
    we have the 465 hp versions in a 43 Ocean, and so far have been happy with them. The cooling system appears to be quire robust, just has about a dozen anodes, so keep in top of those. At one point I found the temps were creeping into the low 180's while at cruise, found I only had 3 out of 7 blades left on the impeller, I know shame on me for not checking impellers more often. Also I see that this model is not offered in pleasure rating anymore and is only sold as a commercial model which is encouraging.
  5. Boatbuilder, Mar 11, 2021
    #5
    Boatbuilder

    Boatbuilder Member

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    Jun 27, 2011
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    The valve issue was for a certain number of early serial numbers on the old 440hp Yanmar. Still a good engine, but if you are buying a boat with these you must determine if the valves have been replaced, generally a swap out of the heads.