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Yanmar 4JH3 Raw Water Pump Impeller

Discussion in 'Big Boats' started by Sjorskye, Aug 24, 2017. Add this thread to a FAQ

  1. Sjorskye

    Sjorskye

    Joined Aug 10, 2017
    2 posts, 0 likes
    Perry Cutter 47
    GC USA GC
    Has anyone else used the relocation kit by [SeaSpaceMarine.com] to relocate their raw-water pump?
    My daughter's boat requires lifting the engine and removing the pump completely just to check the impeller. So instead of repeating this process every year, I am thinking of relocating the pump now and be done with this hassle. What a pain!!!!
    Would be interested in anyone's experience.
     


  2. Don Lucas

    Don Lucas

    Joined Jan 12, 2011
    675 posts, 14 likes
    Hunter 410
    US Salem MA
    Never even heard of such a thing but was interested in seeing it. But I couldn't find in on web site you indicated so maybe a link would be helpful in getting answers.
     


  3. justsomeguy

    justsomeguy

    Joined Feb 20, 2011
    5,486 posts, 479 likes
    MacGregor, Island Packet 35
    US Tucson, AZ/San Carlos, MX
  4. artboas

    artboas

    Joined Jun 1, 2009
    943 posts, 23 likes
    Hunter 49
    ca toronto
    Ok
    So they say imitation is the sincerest form of flattery
    Well, if you look on the forums, I did a 20 page write-up on how to refit this pump to your engine.
    I sincerely doubt this is a "patent pending" system
    Now, I agree that mounting the F5B-9 is the way to go. I spent a lot of time engineering the solution
    What this guy is leaving out is a critical part of the equation, and that is how to keep the pump from rotating.
    I am not sure what he is selling, other than an aluminum plate.
    And you should not remove the harmonic balancer bolts as he's suggesting
    I think you should look at my previous post.

    Good luck
     


  5. justsomeguy

    justsomeguy

    Joined Feb 20, 2011
    5,486 posts, 479 likes
    MacGregor, Island Packet 35
    US Tucson, AZ/San Carlos, MX


  6. artboas

    artboas

    Joined Jun 1, 2009
    943 posts, 23 likes
    Hunter 49
    ca toronto
  7. justsomeguy

    justsomeguy

    Joined Feb 20, 2011
    5,486 posts, 479 likes
    MacGregor, Island Packet 35
    US Tucson, AZ/San Carlos, MX
    If you can prove prior art, that "patent pending" business from SeaSpaceMarine could be a non-starter?
    Anyways, nice to read about how engineering gets done. Mother of invention and all.
     


  8. artboas

    artboas

    Joined Jun 1, 2009
    943 posts, 23 likes
    Hunter 49
    ca toronto
    So, here's the reality.
    Firstly, there are lots of guys who claim "patent pending" on stuff, when there is, in fact no patent application. Basically, it's a bluff which is neither provable, or disposable.
    Having designed & published this upgrade on the Hunter Owners site, I frankly see nothing remotely patentable.
    Furthermore, it's not finacially viable to do so.
    The pump is off the shelf, and there are many ways to mount it to the crankshaft pulley. Honestly, I find the adapter plate a poor choice, as:
    Is far more expensive than the threaded stud design I documented
    It mandates pulling all the crankshaft pulley bolts, which is a bad idea.
    Also, the threaded stud design allows you to very easily pull the pump, and re-install it without messing around with spacers, etc.
    What I find confusing is that this company didn't address the issue that the F5B-9 is designed to work with 1-1/4" hose. I am fairly confident that this won't work.
    I have a Hunter 49, and my hose size is 1". It was a huge issue to consider adapting my 1" through hull fittings to 1 1/4" hose. Both very expensive, and possibly unreliable.
    It took a lot a thinking to come up with the stainless BSP adapter fittings I documented in my posting.
    So, I'm the first guy to admit that someone bettered my design, and endorse it. But, thus "patent pending kit" simply won't work as advertised, and that's the issue. If someone is handy enough to facilitate this upgrade, they will see the benefits of a simpler & cheaper methodology
     


  9. SEMPERAVANTI41

    SEMPERAVANTI41

    Joined Jun 15, 2012
    276 posts, 9 likes
    Hunter 50 AC
    US Greenport, NY
    Art,
    This adapter looks like it would fit on my 4JH4-HTE. Am I correct?
     


  10. artboas

    artboas

    Joined Jun 1, 2009
    943 posts, 23 likes
    Hunter 49
    ca toronto
    Possibly.
    You'd have to verify with them for dimensions.
    If your crankshaft pulley has 6 bolts, it won't work; that much I know.
     


  11. SEMPERAVANTI41

    SEMPERAVANTI41

    Joined Jun 15, 2012
    276 posts, 9 likes
    Hunter 50 AC
    US Greenport, NY
    Art, I know my crankshaft pulley has one large bolt in the center, and 3 threaded 10 mm holes in a circular pattern.
     


  12. artboas

    artboas

    Joined Jun 1, 2009
    943 posts, 23 likes
    Hunter 49
    ca toronto
    Might work.
    I suggest you get dimensions from the mfg.
    I'm still not keen on removing all the bolts at once though
     


  13. SEMPERAVANTI41

    SEMPERAVANTI41

    Joined Jun 15, 2012
    276 posts, 9 likes
    Hunter 50 AC
    US Greenport, NY
    Have tried to contact "Sea Space' . No reply. Anyone able to contact?
     



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