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  1. #1
    Join Date
    Oct 2016
    Location
    Currently Suffolk
    Posts
    1,076

    Default Cooling Water Strainer

    I've bought a Vetus raw water strainer, the type made of plastic that sits between the inlet seacock and the engine. The chandlers said it should be fitted at or below the waterline and were quite adamant about this. Surely this is duff advice? I think it should be fitted above the waterline and primed before use, thereafter ensuring it has a head of water in it. If it's below water level then it must present a real danger to filling the boat with water if it fails in any way. The boat didn't have one fitted previously so I have nothing to refer back to.

    What do y'all think?
    "I thought my daffodils were yellow until I met Joe Kennedy."

  2. #2
    Join Date
    Jun 2009
    Location
    From the Needles to the Nab, from Cowes to St Catherine's
    Posts
    4,727

    Default Re: Cooling Water Strainer

    Mine is definitely above the water line, but following the last two launches it has needed priming - although that does seem to be a feature of the engine rather than the set up.

    http://www.ybw.com/forums/showthread...ing&highlight=
    1534

  3. #3
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    21,699

    Default Re: Cooling Water Strainer

    Vetus advise that it should be installed 15 cm above the waterline. Search water strainer on their website, you can download the manual.
    Answers to some technical queries at new website http://coxeng.co.uk

  4. #4
    Join Date
    Nov 2009
    Location
    Southampton
    Posts
    35,365

    Default Re: Cooling Water Strainer

    Mine's bronze and I'm not worried about it failing, but I mounted it as high as I could in the engine compartment, above the waterline, so that I can take the lid off to clear the basket without necessarily having to close the seacock.

    (I generally do close it, but at least I won't get a fountain if I forget one day.)

    My raw-water pump is quite capable of pulling the air-bubble through as soon as the engine is started after opening the strainer, so I don't need to do anything in particular to prime it.

    Pete

  5. #5
    Join Date
    Jul 2009
    Location
    North Bucks
    Posts
    698

    Default Re: Cooling Water Strainer

    yes mine is above the waterline, it can then be inspected and cleaned without closing the seacock.
    Andrew

  6. #6
    Join Date
    Mar 2018
    Location
    Aberaeron
    Posts
    1,613

    Default Re: Cooling Water Strainer

    My Vetus strainer is above the waterline and the water pump sees to be able to cope with this.
    My biggest problem is despite only tightening the top down gently trying to get it open again is a real swine.
    I’ve tried a smear of silicon grease on the threads but still it seems to jam solid.

  7. #7
    Join Date
    Oct 2016
    Location
    Currently Suffolk
    Posts
    1,076

    Default Re: Cooling Water Strainer

    Thanks all, you've confirmed my thoughts. I knew I was right, but the chap at the chandlers was so adamant it sowed a seed of doubt in my mind!
    "I thought my daffodils were yellow until I met Joe Kennedy."

  8. #8
    Join Date
    Feb 2007
    Location
    Essex
    Posts
    22,022

    Default Re: Cooling Water Strainer

    Quote Originally Posted by Praxinoscope View Post
    My Vetus strainer is above the waterline and the water pump sees to be able to cope with this.
    My biggest problem is despite only tightening the top down gently trying to get it open again is a real swine.
    I’ve tried a smear of silicon grease on the threads but still it seems to jam solid.
    I have the older non see-through type which is essentially the same. I often have no end of trouble unscrewing it when some macho mechanic has had a go at it. It doesn't need to be screwed very tight at all since that main seal is from the flap inside. Another catch, which may be the same on more modern ones is that the filter seats itself into two grooves down the side. If it is not properly located, the filter distorts and possibly doesn't make such a good seal. If properly installed, my only difficulty is lifting out the flap which only has a small lug to grip and pull against the vacuum, not easy with wet hands.
    Far away is near at hand in images of elsewhere

  9. #9
    Join Date
    Feb 2014
    Location
    Durban, South Africa. 'Elle' Briare FR
    Posts
    432

    Default Re: Cooling Water Strainer

    Quote Originally Posted by prv View Post
    Mine's bronze and I'm not worried about it failing, but I mounted it as high as I could in the engine compartment, above the waterline, so that I can take the lid off to clear the basket without necessarily having to close the seacock.

    (I generally do close it, but at least I won't get a fountain if I forget one day.)

    My raw-water pump is quite capable of pulling the air-bubble through as soon as the engine is started after opening the strainer, so I don't need to do anything in particular to prime it.

    Pete
    Ditto.

  10. #10
    Join Date
    Feb 2011
    Location
    South Oxon Boatat Wicormarine
    Posts
    158

    Default Re: Cooling Water Strainer

    Yes above waterline and works no problem. Getting top unscrewed as others noted can be challenging and mine is very easy access. I made a handle out of 10mm plywood that fits down over the cross on top, much easier to unscrew.

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