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  1. #1

    Default "We recently purchased a 38

    "We recently purchased a 38' sailboat with a 1993 Perkins Prima 50. Engine starts fine but water is someone getting into the engine. Engine was pressure tested & head gasket is ok, exhaust seems to be set up correctly also. Any suggestions would be appreciated."

  2. #2
    Join Date
    Sep 2009
    Westwood, New Jersey, USA

    Default Re: Perkins Prima 50hp water in engine

    At the end of last season the internal tubing of my heat exchanger rotted and I began sucking river water into the block. The engine kept running as it was well cooled but the antifreeze and any water that wouldn't fit in the block forced itself through the filler cap and into the bilge. It might be something to look at.

  3. #3
    Join Date
    Jul 2009
    Orange Park, FL, USA

    Default Re: Perkins Prima 50hp water in engine

    Check to see if you have an anti-siphon loop between heat exchanger and exhaust elbow and that it is not stuck or clogged.

  4. #4

    Default Re: Perkins Prima 50hp water in engine

    These M50s are a PITA

  5. #5
    Join Date
    May 2015

    Default Re: Perkins Prima 50hp water in engine

    Probably a leak in the heat exchanger. Most of the time, the oil pressure is higher than the raw water, so only a little water transfers at startup. You should see some oil loss and a sheen in the exhaust water.

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