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Thread: Raw water pump

  1. #1
    Join Date
    Dec 2017
    Posts
    7

    Default Raw water pump

    My boat came with no water pump as it was removed, buying new would cost me 500 if I add another 700 I could get a new engine! The question is, I got two jabsco water pumps which can pump more water through than the original pump can! Bit I made adapter to make sure my pumps are working and pumping, bit they pump through more water than original should, can this cause any problem to my engine ? Only people who understand are welcome to reply! Pls no guesses! Thanks

  2. #2
    Join Date
    May 2005
    Location
    up on the moors.
    Posts
    32,154

    Default Re: Raw water pump

    The problem might be that the engine is running at too low a temperature, and that leads to poor combustion and wear.

    Are you pumping sea water with pumps designed for fresh ? I am not sure that Jabsco FW pumps are designed for continuous operation e.g. for an hour or two.

    What make and model is the engine please ?
    I think, therefore I am. I am, therefore I sail.

  3. #3
    Join Date
    Jan 2016
    Location
    Ipswich & Southwold
    Posts
    772

    Default Re: Raw water pump

    Maybe pop a post in the practical forum, more people are likely to see it there
    Electrics & electronics Suffolk & Southwold Boatyard
    Custom Panels + Eberspacher/Webasto

  4. #4
    Join Date
    Jun 2011
    Location
    Suffolk
    Posts
    3,712

    Default Re: Raw water pump

    Oddly enough a ‘different’ poster did just that yesterday.

    http://www.ybw.com/forums/showthread...rpump-question
    You can’t make me, I’m retired.
    You sort it out.

  5. #5
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    7,812

    Default Re: Raw water pump

    deleted
    It is all down to the fact that my wife does not understand me !!

  6. #6
    Join Date
    Oct 2010
    Posts
    676

    Default Re: Raw water pump

    My father, a life time steam engineer ,said you can restrict the output of an impeller pump, with no problems, but if you restrict the input side, it eats impellers quickly .

  7. #7
    Join Date
    Sep 2010
    Location
    Where life is good
    Posts
    11,788

    Default Re: Raw water pump

    The raw water pump also needs to be matched to the exhaust gas volume. Too much raw water could lead to flooding the exhaust system and choking the engine... or even worse causing a hydraulic blockage backing up to the engone itself.

    PS Sorry, but I don't know how to calculate such things.
    Life is too short to drink bad wine.

  8. #8
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    7,812

    Default Re: Raw water pump

    Has op disappeared -----again!!!
    It is all down to the fact that my wife does not understand me !!

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