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  1. #1
    Join Date
    Oct 2001
    Posts
    430

    Default How to replace Johnson raw water pump

    The F4B-9 pump on my Nanni 21 is dripping from the back, not the cover. It seems like the seal has gone. I think I'll replace the whole pump and refurbish the old one for a spare. I can't find any description of how to do this. Is it difficult? Can anyone point me to a YouTube tutorial or something, I can't find anything. Thanks, Colin

  2. #2
    Join Date
    Jan 2012
    Location
    South Coast
    Posts
    4,991

    Default Re: How to replace Johnson raw water pump

    This manual might help with parts, etc, but they are not very complex.

    https://www.dropbox.com/s/0w6acer1s8...ed%29.pdf?dl=0
    Interested in Corvettes PM me for details of the Corvette Motorboat Association

  3. #3
    Join Date
    Jun 2014
    Posts
    73

    Default Re: How to replace Johnson raw water pump

    very easy repair or replace got the same engine and pump parts from asap and job is straight forward nanni manual or if i recall how to in box of bits just make sure shaft is very clean and unpitted otherwise not fitting new seals think all you need is circlip pliers and screwdriver and a 10mm spanner
    im going to strip mine next week if want a video let me know
    but im sure its on youtube somewhere

  4. #4
    Join Date
    Nov 2011
    Location
    Sydney, Australia.
    Posts
    4,849

    Default Re: How to replace Johnson raw water pump

    You may find a gear puller useful if you intend dismantling the shaft (of the gear). First time I did it, on an Volvo MD2020 (which is bound to be different), I used a wooden mallet - but a gear puller is better (and what I use now).

    Its simple stuff, except on the Volvo you need very small, short, spanners and preferably a monkey as an apprentice. I chopped down spanners to make the job manageable.

  5. #5
    Join Date
    Oct 2001
    Posts
    430

    Default Re: How to replace Johnson raw water pump

    Quote Originally Posted by thegasmannick View Post
    very easy repair or replace got the same engine and pump parts from asap and job is straight forward nanni manual or if i recall how to in box of bits just make sure shaft is very clean and unpitted otherwise not fitting new seals think all you need is circlip pliers and screwdriver and a 10mm spanner
    im going to strip mine next week if want a video let me know
    but im sure its on youtube somewhere
    A few pics or video would be great. I'll PM you.

  6. #6
    Join Date
    Apr 2005
    Location
    Shropshire
    Posts
    8,571

    Default Re: How to replace Johnson raw water pump

    https://www.pbo.co.uk/practical-proj...ter-pump-20635
    This may help or look on YouTube.

  7. #7
    Join Date
    Mar 2008
    Location
    Argyll
    Posts
    6,143

    Default Re: How to replace Johnson raw water pump

    There is a useful site published by Compass Marine called marine how to .com. it gives well illustrated and effective advice on things like rebuilding or servicing water pumps, changing alternators and other stuff that only occasionally needs doing, it is an american site but a good one.
    I am away to google it and should be back with a link soon.

    https://www.pbase.com/mainecruising/raw_water_pump

    update

    https://www.marinehowto.com
    Last edited by Quandary; 18-05-19 at 10:36.

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