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Man CR 900 engine mounts/isolators

Discussion in 'Cabo Yacht' started by Breckster, Jan 7, 2026 at 4:30 PM.

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  1. Breckster, Jan 7, 2026 at 4:30 PM
    #1
    Breckster

    Breckster Member

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    Anyone have a source or recommendation for Engine isolators (motor mounts) for Man CR900’s. I was quoted $2200 a piece for MAN but that seems a bit pricy? Assuming someone other than MAN manufactures them? I did a quick google search but really didn’t come up with much :(

    thank you for any assistance
  2. captholli, Jan 7, 2026 at 6:25 PM
    #2
    captholli

    captholli Senior Member

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    Megi used to supply the mounts for MAN, don't know if they still do but try Megi or Meinert marine engine mounts. Also, you can try Rubber Design marine engine mounts. $2,200 doesn't sound that high depending on HP and model. Either way, quality long lasting mounts aren't going to be cheap.
  3. Capt Ralph, Jan 7, 2026 at 6:26 PM
    #3
    Capt Ralph

    Capt Ralph Senior Member

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    Last edited: Jan 7, 2026 at 6:31 PM
  4. Capt J, Jan 7, 2026 at 11:18 PM
    #4
    Capt J

    Capt J Senior Member

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    It's the $ to Euro exchange rate which is driving the price up.
  5. mapism, Jan 8, 2026 at 12:28 AM
    #5
    mapism

    mapism Senior Member

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    Unless rust ate them badly, there should be a small plate on the side of each mount, showing the part #.
    It might be hard to see that from a photo, but if the OP can read those plates, it's relatively easy to look for some alternative supplier.
    Just be aware that even if the mounts look identical, their part # could be different, due to possibly different hardness of the rubber part between the front and the rear of the engines.
    Just for reference, the OEM MAN p/n are "51.96210-70xx", whereas in the "xx" bit (according to their official EU price list) there are 22 different numbers, all with different prices, ranging between 680 and 1800 Euro. I kid you not!

    That aside, Breckster, if you don't mind me asking, I'd be interested to hear why you must replace those mounts.
    What makes me curious is that my engines (V8/800), even if very different because they were the very last of 100% mechanical MANs, as opposed to yours which were the very first fully electronic CR, are almost identical from the mechanical/dimensions viewpoint. So, I would think your mounts are very similar if not exactly the same as mine.
    But if I look at the conditions of mine, I would hope they will outlive me - even if already 22 years old by now!
    BTW, pretty sure your engines can't be older, since IIRC the CR900 was introduced in 2005, so it can't be a matter of age...
  6. JWY, Jan 8, 2026 at 7:27 AM
    #6
    JWY

    JWY Senior Member

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    I'm sorry I can't help Breckster and I have no mechanical knowledge to add to this thread, but Mapism's response is such an outstanding example of what makes YachtForums great and the quality of our posters. It's why I read every thread and am appreciative that I learn so much, even if not particularly relevant for me.
    mapism, Capt Ralph and motoryachtlover like this.
  7. Breckster, Jan 8, 2026 at 9:15 AM
    #7
    Breckster

    Breckster Member

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    One of the bolts (isolator) was snapped. It was recommended to replace all or at a minimum both in the same position; ie front/back. I’m not near the boat, it is sitting at Caison’s in NC: bringing it to Michigan from Puerto Rico.

    I do appreciate the assistance and knowledge of this group. I’m always amazed at the quick and knowledgeable responses back.. thank you.

    Mapism…. I will see if I can get a picture/serial number.
  8. mapism, Jan 8, 2026 at 1:20 PM
    #8
    mapism

    mapism Senior Member

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    Wow. A snapped bolt on an engine mount is something I'm glad I never experienced!
    In principle, I would agree with the recommendation you got, but it may be worth also investigating further the reason for the failure.

    I mean, the best case is a defective part or a bad installation of that particular mount, and the replacement would fix that for good.
    But if the bolt snapped due to fatigue, triggered by excessive vibrations, load, or whatever, it might be just a matter of when the new one will snap again...

    In your setup, do the engine mounts withstand also the propeller thrust?
    In mine, there's a jackshaft connecting the gearbox to a separate V-drive unit, which takes care of transferring the prop/shaft thrust to the hull stringers.
    So, what the engine mounts must deal with is only the engine weight and its vibrations while running, but without any additional longitudinal load from prop/shaft.
    There's a big difference in engine mounts wear, between the two alternatives...