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  1. #11
    Gold Member Katahdin's Avatar
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    Dec 2010
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    454
    Location
    Scarborough, ME
    Tractor
    Yanmar LX4500, Toro z420

    Default Re: 4tnv88 Block Heater

    I forgot to add regarding hose heaters, there seems to be a problem with most of them tripping circuits in GFCI 110V outlets. I know this is the case with the hose heater that came with my 93' GMC. Naturally all my outdoor outlets are GFCI so I've never used it.

  2. #12
    Bronze Member
    Join Date
    Jun 2009
    Posts
    83
    Location
    Adirondack Mts, Fulton County , NY
    Tractor
    YM 336D

    Default Re: 4tnv88 Block Heater

    Quote Originally Posted by Katahdin View Post
    I forgot to add regarding hose heaters, there seems to be a problem with most of them tripping circuits in GFCI 110V outlets. I know this is the case with the hose heater that came with my 93' GMC. Naturally all my outdoor outlets are GFCI so I've never used it.
    I have two heaters in my 336D, one in the block 750W and one in the transmission / rear-end 1KW. Only problem ever encountered was the rather rude surprise contained in the electric bill. Since my place is mostly for week ends duringthe winter I use a swimming pool timer goes on a noon thrusday and off a midnight Saturday.

    Big savings paid for it self the first month.

  3. #13
    Platinum Member Scotty Dive's Avatar
    Join Date
    Feb 2010
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    775
    Location
    Ct
    Tractor
    Yanmar 2020D

    Default Re: 4tnv88 Block Heater

    Hey Gang....I am hijacking this thread as I believe the original poster worked out his problem....If I need to start a new thread...please let me know.

    So with Winter in full swing in New England, my YM2020D with the 3T82B-N engine struggles but always starts when its really cold...I just don't like the idea of it struggling so much and was thinking of installing a block heater that Hoye Sells - but I do not want to touch the block if there is a significant possibility that I screw something up. In Katahdins original post and picture, he has a plug that has a square hole that would seem logical that it would unscrew. However in my block I only have plugs and something that I am wondering if its possible was designed to accept a block heater. Please see the image below and the plugs are labeled "B" and the mystery area is labeled "A". If I need to pull the plug B - how is that done and do I need to tap that hole? Thats a pretty big hole to tap????. What is "A"? By the way this is the "passenger side of the tractor.

    Thanks,

    Scotty Dive
    Yanmar YM2020D "Git er Done Too"
    Pictures! http://s139.photobucket.com/albums/q...t=dfc00199.pbw
    Yanmar Tractor Database - Click Link, then click file and download the excel file.: https://drive.google.com/file/d/0BxR...it?usp=sharing

  4. #14
    Veteran Member
    Join Date
    Dec 2009
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    2,434
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: 4tnv88 Block Heater

    No idea about A but I would say B is press in freeze plugs. Stupid question I guess but what is on the other side of your block? I thought that was where the screw out plug was. Right above the starter.

  5. #15
    Gold Member Katahdin's Avatar
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    Dec 2010
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    454
    Location
    Scarborough, ME
    Tractor
    Yanmar LX4500, Toro z420

    Default Re: 4tnv88 Block Heater

    I have come across in my research a block heater that looks like it could fit A: Zerostart part number 3500001. Its listed for the Yanmar 3TN66 and 3TN72 engines. Maybe it'll also match up to yours?

    ZeroStart - 350-0001 - Circulation Heater

  6. #16
    Gold Member
    Join Date
    Nov 2004
    Posts
    322
    Location
    Nevada
    Tractor
    John Deere 970

    Default Re: 4tnv88 Block Heater

    I've installed and used both. The inline rad hose install was more of a chalange working in a tight space. It was a Kats, and went into the 3T84 in my YM3000. Had to drain the coolant. Almost the same engine in my JD950 got a screw in block heater. ( 3T90J ) Hex head plug was behind the starter, had to remove the starter to unstick the plug, had to give it a little heat to break it loose. Think the 950 heats up faster with the block heater than the YM3000 did with the hose heater. Think a little more of the heat transfered to the radiator in the YM3000 than with the plug in the JD950. If I have it to do again with my new to me 970, I'll opt to do the screw in heater. I like unplugging the removable cord and getting it out of harms way in the summer.
    Chris

  7. #17
    Platinum Member Neat 1500's Avatar
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    Aug 2009
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    576
    Location
    Melbourne,Australia
    Tractor
    Yanmar YM1500 Red & YM14 MkII

    Default Re: 4tnv88 Block Heater

    A looks to be a cover into the crank area ie"oil behind it,not water" and B we here call them welsh plugs which are in the water jackets. i think you would struggle to tap those big sucker holes, plus i dont think there would be much room behind it either to get much depth?
    Paul YM1500 & YM14 MkII

  8. #18
    Platinum Member Scotty Dive's Avatar
    Join Date
    Feb 2010
    Posts
    775
    Location
    Ct
    Tractor
    Yanmar 2020D

    Default Re: 4tnv88 Block Heater

    Quote Originally Posted by winston1 View Post
    Stupid question I guess but what is on the other side of your block? I thought that was where the screw out plug was. Right above the starter.
    Glad you said something Winston.....I didn't see this even after looking a few times....Its 17 degrees out today....I would hate to have to start the tractor today....So I can assume this is the plug the block heater would go - So, some propane heat the some force and I should be able to get it out? Will I lose all of the coolant or just a bit like Katahdin did?

    Thanks,

    Scotty Dive
    Yanmar YM2020D "Git er Done Too"
    Pictures! http://s139.photobucket.com/albums/q...t=dfc00199.pbw
    Yanmar Tractor Database - Click Link, then click file and download the excel file.: https://drive.google.com/file/d/0BxR...it?usp=sharing

  9. #19
    Veteran Member
    Join Date
    Dec 2009
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    2,434
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: 4tnv88 Block Heater

    I am thinking that plug should measure appx 1-5/16". That is the appx diameter of 1" pipe. Pretty confident that is the thread size on the block heater that Hoye sells. Tapping on a pipe plug can sometimes help in removal. Penetrating oil is next to useless in my opinion because tapered pipe plugs are made to seal and they do. I am not sure I can tell from your picture but that looks like a square head rather than a square socket? I wouldn't think you would loose over half your coolant if that much.

  10. #20
    Super Member California's Avatar
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    Jan 2004
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    5,401
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: 4tnv88 Block Heater

    After a lot of plumbing repairs on a hundred year old farmhouse - unscrewing anything with large pipe threads scares me. It would be my luck to tear the head off that 30 year old plug before the plug unscrewed. And using a huge breaker bar risks bumping unrelated components.

    Approach with caution!


    re losing fluid - first remove the radiator cap to relieve pressure.

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