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Identifying a flexible coupling on a Nauticat 331

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  • #75942
    Andrew Hollway
    Participant

    My Nauticat 331 has a flexible coupling between the gearbox and propeller shaft. The engine is a Yanmar 4JH 3TE and the gear box is KM4A. The attached photo shows the coupling. Can anyone identify the make and model? I’ve been given various suggestion, Bullflex or various Vetus ones but they are all subtly different. Thanks. Andrew

    #75944
    Paul Jepson
    Participant

    I believe it is a Vetus Uniflex coupling type 13 or 16.
    Paul Jepson

    #75961
    Andrew Hollway
    Participant

    Thanks Paul for the suggestions. It looks similar to a type 13 but Vetus indicate this is only suitable for up to 45 HP and the 331 is 75HP. The type 16 appears very different on the vetus website. The whole question arose from a minor vibration in the propeller shaft and the suggestion that the rubber bushes in the coupling might be worn. All the advice I have is that this is unlikely and much more likely to be either a worn cutlass bearing and/or P bracket bearing. The boat comes out of the water next month so we’ll be able to investigate further.
    Thanks
    Andrew

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