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  1. #1
    Bronze Member YM1720D's Avatar
    Join Date
    Mar 2012
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    53
    Location
    Ocala, FL
    Tractor
    Yanmar 1720D

    Default Cylinder head casting

    For you all that have head the valve cover off I have a question.
    I was checking my valve clearance yesterday on my 1720 and cast into the head was 3t72. It was between to sets of valves. The tag on my valve cover says 3t75. I was a little thrown off by that and am now wondering if that is normal? Maybe 3t72 and 3t75 heads interchange? Or maybe it means nothing and I'm paroniod
    Anyone else seen the engine model cast into the head?

  2. #2
    Bronze Member YM1720D's Avatar
    Join Date
    Mar 2012
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    53
    Location
    Ocala, FL
    Tractor
    Yanmar 1720D

    Default Re: Cylinder head casting

    I went back outside and checked and I do have 3t75 stamped on my block. I was hoping I didn't have the wrong motor in my tractor lol. Is it possible I have the wrong head on my engine?

  3. #3
    Platinum Member Neat 1500's Avatar
    Join Date
    Aug 2009
    Posts
    593
    Location
    Melbourne,Australia
    Tractor
    Yanmar YM1500 Red & YM14 MkII

    Default Re: Cylinder head casting

    apparently thats common, some model engines have shared heads between them. nothing to worry about.
    Paul YM1500 & YM14 MkII

  4. #4
    Advertiser
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    Jun 2005
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    199
    Location
    Washington

    Default Re: Cylinder head casting

    was your tractor a Vietnam recon tractor???
    Coldwater Tractors, Inc.
    www.coldwatertractors.com

  5. #5
    Bronze Member YM1720D's Avatar
    Join Date
    Mar 2012
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    53
    Location
    Ocala, FL
    Tractor
    Yanmar 1720D

    Default

    No not a Vn. I wrote Aaron at hoye and he said that Yanmar does that from the factory and casting numbers rarely march. Some even have John Deere casting numbers. So nothing to worry about. I knew I was being paranoid for nothing lol good info to know

  6. #6
    Elite Member Car Doc's Avatar
    Join Date
    Mar 2009
    Posts
    3,246
    Location
    Kansas
    Tractor
    YM3810D Yanmar

    Default Re: Cylinder head casting

    fwtw my engine casting is different than my cyl head also and I wondered the same thing and ended up finding out it was correct.
    Yanmar YM3810D, LT duty 3pt hoe, 6' KK2 tiller, 6' KK box blade, 6 1/2' KK disc, 5' Howse bush hog, 5' Howse back blade, 9" Yellow PHD, 3 Husky chain saws 346XP NE, 359, 372XP. 07 HD Heritage Softail, Crack injectors, check compression, take 2 beers and call me. "Hey you didn't build that."

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