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  1. #1
    Gold Member
    Join Date
    Mar 2011
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    356
    Location
    Florida Ma.
    Tractor
    Ford 1720 SSS 4x4

    Default Yanmar, converting fixed speed Yanmar to variable speed.

    I found a small fixed speed 3 cylinder Yanmar Thermo-king diesel that has no throttle lever for speed adjustment. I would like to change it to variable speed by replacing the injection pump. Not much information available from engine tags.
    Does anyone know what is required? Perhaps just a new injection pump with a throttle lever?
    Numbers on block are K6K29977
    Valve cover
    TK3.74
    K29977
    Any info would be appreciated.

    Thanks 90Cummins

  2. #2
    Veteran Member
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    May 2004
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    1,288
    Location
    S.E Texas
    Tractor
    Ym1300d-1401D-1601D , 1610D & Massey Ferguson 1020

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    I have a Hatz diesel with fixed throttle and wanted to change it to variable. I was told that all I needed was to change the governor spring (from a Hatz representative).

    Wonder if that's all you need for your Yanmar??

  3. #3
    Elite Member
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    Jul 2006
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    4,409
    Location
    Northwest, WA

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    Quote Originally Posted by 90cummins View Post
    I found a small fixed speed 3 cylinder Yanmar Thermo-king diesel that has no throttle lever for speed adjustment.
    Positive ?, reason I ask is that all the TK 3.74 that I've worked on had a lever for speed control and a separate fuel shut-off solenoid.

    Like this pic from a TK manual.... yours not the same ?
    Attached Thumbnails Attached Thumbnails Yanmar, converting fixed speed Yanmar to variable speed.-tk3.74.jpg  
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  4. #4
    Veteran Member
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    Jun 2010
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    1,378
    Location
    Southern California
    Tractor
    International Harvester 284, Yanmar 1401D, Yanmar 240

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    What type of flywheel does the engine have? Is it adaptable to a clutch, or does it have an oddball flywheel with a fixed coupling to drive the compressor?

  5. #5
    Gold Member
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    Mar 2011
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    356
    Location
    Florida Ma.
    Tractor
    Ford 1720 SSS 4x4

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    I've only seen the engine in photos, it doesn't have any levers on the injection pump but there is a closure plate where the lever would be.
    The flywheel end has a PTO shaft with pulleys on it so I can't see the flywheel.
    The owner said it is fixed speed with no adjustments.
    I would think (hope) it could be changed with little effort/cost with parts on e-bay.
    90cummins

  6. #6
    Elite Member
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    Jul 2006
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    4,409
    Location
    Northwest, WA

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    Well somethings up then cause if it was indeed on TK refrigeration unit it WOULD have a high/low speed lever.

    See if you can find out the model unit it came from and I'll dig up a manual.
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  7. #7
    New Member
    Join Date
    Sep 2013
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    2
    Location
    vicksburg michigan
    Tractor
    ih cub cadet 147-cub cadet 1872

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    Can anybody help find the HP and torque rating on this engine. Also is it similar to any other non thermo king yanmar engine. Thanks

  8. #8
    New Member
    Join Date
    Sep 2013
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    Location
    vicksburg michigan
    Tractor
    ih cub cadet 147-cub cadet 1872

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    Looks like its only 12.6 HP? Why is this so heavy?

  9. #9
    Bronze Member
    Join Date
    Apr 2004
    Posts
    54

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    The HP rating is likely at a lower rpm than L&G engines. Once you figure out the throttle/governor issue and raise the speed the HP will also go up.

    Sorry, can't help with the speed issue.

    Try this guy: Sheaffer's Town & Country Tractor. He's very knowledgeable and has great parts contacts.

  10. #10
    New Member
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    Nov 2013
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    Location
    amsterdam
    Tractor
    jd317

    Default Re: Yanmar, converting fixed speed Yanmar to variable speed.

    www green tractor talk com/forums/attachments/general-repair/21736d1379382866-yanmar-engine-questions-332-430-engine-specs.jpg

    http://golftechs.us/Manuals/JD220dieselengine.pdf
    Attached Thumbnails Attached Thumbnails Yanmar, converting fixed speed Yanmar to variable speed.-yanmar-motors-3tn66-332-430  
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