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Yanmar

Discussion in 'Yamaha' started by kampuniform, Mar 28, 2019. Add this thread to a FAQ

  1. kampuniform

    kampuniform

    Joined Jan 20, 2017
    78 posts, 33 likes
    Yamaha 33
    Ca Vancouver
    I’ve a Yamaha 33’, and was curious about the difficulty of replacing the stock 2GM with a 3GMD. Can the engine bay incorporate the larger engine?
     


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  2. mermike

    mermike

    Joined Nov 21, 2012
    27 posts, 4 likes
    Yamaha 33
    US Port Ludlow, WA
    Kamp,

    Mine has a 3GM30F. Can't say it's roomy but it fits. Access to the lift pump and secondary strainer is a PITA but doable.

    Mike
     


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  3. kampuniform

    kampuniform

    Joined Jan 20, 2017
    78 posts, 33 likes
    Yamaha 33
    Ca Vancouver

    Outstanding, mate!
     


    Dave Groshong likes this.
  4. Charles Erwin

    Charles Erwin

    Joined Jan 30, 2012
    1,032 posts, 151 likes
    Nor'Sea 27 - "Kiwanda"
    US Portland/Anacortes
    Yes. Except the motor mounts will not match up because the motor is longer/wider. That means shorter shaft or longer stringers and that means you might need additional clearance on the forward/back end maybe both. Do you have the space? Perhaps the width is different so the stringers will be too narrow. Also likely the height will not match either. These all need to match up otherwise one cannot align the shaft to the motor to say nothing of a solid motor mounting structure. Remember the shaft pushes on the motor, thence on the motor mounts, which pushes or pulls the boat so these things need to be paid attention to.

    Just a preview. There are other gremlins in every re-power. They are usually not the nice kind.

    Charles
     


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  5. kampuniform

    kampuniform

    Joined Jan 20, 2017
    78 posts, 33 likes
    Yamaha 33
    Ca Vancouver
    Thanks, Charles. Excellent points. I’m okay on width and height, as the only change is the additional length of a cylinder going from the 2GM to 3GM. The engine bay is relatively roomy with the 2GM, so this might work with a bit of fiddling here and there, and certainly a smoother more reliable ride on three cylinders.
     


  6. Satori

    Satori

    Joined Sep 25, 2008
    9 posts, 2 likes
    Yamaha Y-30 MkII
    Ca Sidney BC
    Kampu, why the change? Problems with the 2GM or just looking for more power?
    I'd love to replace the YSM12 in my 30, but just to get a little more oomph. (currently the mortgage prohibits me from actually pursuing that)
     


  7. StargazerP303

    StargazerP303

    Joined Oct 22, 2014
    254 posts, 80 likes
    Pearson P303 #221
    US RockPort Maine
    One thing I would look at is "Parts available 3GMF". Yes, more and more parts are going, going.. gone! Yes, you can find them but at a very steep price if you noticed for the 2GM series. So if, you have your mind set on doing it make sure you use THE new brand footing and not the old style or original series. 100,150,75 etc. Just take your time and talk around on parts too. Capt Rob 2GMF-13.
     


  8. mermike

    mermike

    Joined Nov 21, 2012
    27 posts, 4 likes
    Yamaha 33
    US Port Ludlow, WA
    I'll shoot you some motor mount photos next weekend.
     


  9. kampuniform

    kampuniform

    Joined Jan 20, 2017
    78 posts, 33 likes
    Yamaha 33
    Ca Vancouver
    The 2GM rating is 13hp when factory fresh, and that fresh glow is decidedly off the unit now. No issues mechanically, but we were compromised by its lack of gusto on one occasion: we needed to get out of some bad weather, and couldn’t gain any purchase against the wind and tide. Fortunately, we found an alternative ad hoc wind/wave break to hide behind, but things could easily have taken a nasty turn had we not found the alternate.
     


    Satori likes this.
  10. kampuniform

    kampuniform

    Joined Jan 20, 2017
    78 posts, 33 likes
    Yamaha 33
    Ca Vancouver
    Cheers mate.

    I shop on eBay and Craigslist for most of my 2GM parts, so that takes some of the sting out of ownership. Hopefully, it’ll be the same with the 3.

    Thank you for the footing info.
     


  11. kampuniform

    kampuniform

    Joined Jan 20, 2017
    78 posts, 33 likes
    Yamaha 33
    Ca Vancouver
    Outstanding!
     


  12. StargazerP303

    StargazerP303

    Joined Oct 22, 2014
    254 posts, 80 likes
    Pearson P303 #221
    US RockPort Maine
    Good, then you have some ideas about what you are going to face down the line $$$. One suggestion here is above all purchase a complete set of gaskets and rings for that engine to keep. when you use one just replace it this way you'll be able to shop around at your leisure and you will SAVE $$$$
    Capt. Rob
     


  13. mermike

    mermike

    Joined Nov 21, 2012
    27 posts, 4 likes
    Yamaha 33
    US Port Ludlow, WA
    Hopefully these help.
     

    Attached Files:



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  14. StargazerP303

    StargazerP303

    Joined Oct 22, 2014
    254 posts, 80 likes
    Pearson P303 #221
    US RockPort Maine
    Mike nice pic's Thank You. Looking at yours and the rusty, you're going to need some yourself. Keep an eye on them.
    Capt. Rob
     


  15. kampuniform

    kampuniform

    Joined Jan 20, 2017
    78 posts, 33 likes
    Yamaha 33
    Ca Vancouver
    It looks like that 3GM kicked up a bit of a fuss getting in there, but it slotted in perfectly in the end. The adaptation seems quite simple, as it only involves a linear translation. Quite doable, I can see. Thanks, Mike!
     




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