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Thread: Yanmar 10GM

  1. #1

    Default Yanmar 10GM

    Hi all, I have a seawater cooled Yanmar 10GM and it has a habit of setting off the 'water' alarm. It seems to dislike turbulent water but it will also happily run for an 1 1/2 quite happily and then go off for no apparent reason. I have checked the impeller and the seacock filter and there is always water coming out the back when the alarm goes off. I put it into neutral and after 30 secs or so the alarm goes off and I carry on for maybe another half hour or so and the same thing happens again. Its about 50 hours 'old' and probably needs a service but can anyone help with this specific problem . . . . ?

    Thanks in advance.

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  2. #2
    Join Date
    Feb 2002
    Posts
    604

    Default Re: Yanmar 10GM

    If the engine is only 50 running hours old then you've either got not enough water coming through (Crippled intake pipe?), a faulty thermostat, or a blockage/constriction before/after the impellor.

    Take it back to the installer and get them to sort it out.

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  3. #3
    Join Date
    Jul 2003
    Posts
    122

    Default Re: Yanmar 10GM

    maybe the belt is slipping and reducing the amount of water needed.

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  4. #4
    Join Date
    May 2001
    Posts
    841

    Default Re: Yanmar 10GM

    Hi Jeep
    I also have a 1GM10 and although I like the engine this is I think a weakness,
    Occasionaly my engine has refused to prime on starting or more rarely has perhaps sucked in airated water when motor sailing.
    I have had the boat around 4 years and find some impellors are better than others although I like the idea of the Globe run dry impellors and have used them succesfully in other engines they dont seem to like my Yanmar.
    Now I carry several OEM impellors but when I find one that is working well I dont change it anually as I have found my probs usually start after a impellor change.
    Just a point though are you sure you do not have a faulty temp sender you could easily check it with a multimeter and a pan of hot water (I think the raw water senders switch around 55 to 60 degrees)
    I bought a fresh water one recently and it cost 49
    and dont be tempted to carry on unless you are sure its a faulty sender as I burnt out the exhaust hose after about 3 mins( it totally delaminated )inside

    Pete


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  5. #5
    Join Date
    Feb 2002
    Posts
    604

    Default It\'s direct drive (nm)





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  6. #6
    Join Date
    Feb 2002
    Posts
    2,431

    Default Re: Yanmar 10GM/Impellor Problem?

    I seem to remember that Yanmar had a problem with their impellors in the past in that the rubber vanes became unbonded from the central bush, causing the cental bush to spin but not drive the vanes - thus causing low water flow. Could this be your problem? Might be worth checking that the rubber is still bonded to the centre....


    <hr width=100% size=1>dickh
    I'd rather be sailing... :-) [img]/forums/images/icons/smile.gif[/img]
    dickh
    I'd rather be sailing... :-) [img]/forums/images/graemlins/smile.gif[/img]

  7. #7

    Default Re: Yanmar 10GM/Impellor Problem?

    Thanks for the info all, I shall check all the points out next time I'm on the boat. Going back to the original supplier isn't really an option though; its only 50 hours old but also several years if you get my drift!

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  8. #8
    Join Date
    Jun 2001
    Posts
    52

    Default Re: Yanmar 10GM

    there was a thread on this a while ago and I seem to remember that it was due to a faulty connection somewhere behind the Yanmar control panel.
    John

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  9. #9
    Join Date
    May 2001
    Posts
    29,898

    Default Re: Yanmar 10GM

    yes, i also have this problem (with a raw water cooled 3GM30). in the past it would suddenly overheat while under way in choppy conditions but lately it won't deliver any water unless i manually prime the pump but once started it runs ok.

    i've been thinking about a new pump body but maybe i should try different impellors. the engine has about 1500 hours on the clock.

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    One hull good, two hulls better.

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