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  1. #21
    Join Date
    Mar 2017
    Posts
    8

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    Quote Originally Posted by Laysula View Post
    Cheers Dean-Bolton.
    Mines a 3gm30 f so it looks like it should be doable.
    Steve
    Hi Steve,
    It's good news and bad news. The YM pump will bolt on using the upper bolt and the belt aligns perfectly. However, the adjusting slot is miles away from the engine. The factory back plate bracket for the YM series won't fit the GM series at all as the timing cover is a different shape. It looks like it would be possible at least in theory to make a custom back plate that would do the job. Food for thought there.



  2. #22
    Join Date
    May 2011
    Location
    Rochester Kent
    Posts
    54

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    I managed to get a lip seal with 2 lips
    Wasn't sure of stainless spring so fitted a o ring
    After 200 hrs still going good
    Have fun

  3. #23
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    21,592

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    Quote Originally Posted by laurie the sailer View Post
    I managed to get a lip seal with 2 lips
    Wasn't sure of stainless spring so fitted a o ring
    After 200 hrs still going good
    Have fun
    The stainless spring works well. Volvo seals appear to be identical to the Yanmar ones, with a stainless spring instead of a copper alloy one. I had been using the Volvo one for some years, until Marine-power offered me some similar, non-Volvo ones for half the price, since when I have carried them.
    Answers to some technical queries at new website http://coxeng.co.uk

  4. #24
    Join Date
    Jan 2017
    Location
    N. Fambridge
    Posts
    109

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    The basic idea of replacing the standard pump with the Yanmar 128990-42510 version, so the impeller can be changed without removing the pump. Thanks Dean-Bolton for posting those pictures of a GM with it attached, and the older version for comparison. I think it would be fairly simple to modify the backplate by welding on an additional plate for the adjusting slot. The quandry is whether to spend quite a bit of money on the newer version and get welding or not!

    Giles

  5. #25
    Join Date
    Mar 2017
    Posts
    8

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    Would anyone be interested in some sort of group buy? We could have some brackets made that allow existing pumps and also the new style pumps to be fitted. If enough people went for it we could have them zinc plated also so they would look like the factory items.
    Ballpark I would imagine just the bracket would be somewhere between £50 - £100. If enough people were interested in a full kit with new hose and anything else required we could look at that too.
    Should we start a new thread for this?

  6. #26
    Join Date
    Jun 2008
    Location
    Brixham
    Posts
    897

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    Yes I would be up for that.
    Quote Originally Posted by Dean-Bolton View Post
    Would anyone be interested in some sort of group buy? We could have some brackets made that allow existing pumps and also the new style pumps to be fitted. If enough people went for it we could have them zinc plated also so they would look like the factory items.
    Ballpark I would imagine just the bracket would be somewhere between £50 - £100. If enough people were interested in a full kit with new hose and anything else required we could look at that too.
    Should we start a new thread for this?

  7. #27
    Join Date
    Aug 2012
    Location
    Essex
    Posts
    12

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    Hi Dean
    I know this is a old thread but did you ever get any takers for this
    regards
    Mark

  8. #28
    Join Date
    Jan 2017
    Location
    N. Fambridge
    Posts
    109

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    I'm certainly interested!

  9. #29
    Join Date
    Mar 2017
    Posts
    8

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    Quote Originally Posted by masterman ready View Post
    Hi Dean
    I know this is a old thread but did you ever get any takers for this
    regards
    Mark
    Only Giles so far. To make this economical I would think numbers of 6 or more would be required.
    I haven't contacted fabricators yet as there didn't seem to be much interest.

  10. #30
    Join Date
    Feb 2015
    Location
    Erith YAcht Club
    Posts
    424

    Default Re: Substantial money saving tips for Yanmar GM Series owners

    Im in, depending on cost
    Current boat: 1988 Jeanneau Sundream (lifting center board)

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