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  1. #1
    Bronze Member BurningBushFarm's Avatar
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    Nov 2010
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    99
    Location
    WNC
    Tractor
    YM2000D

    Default Overheating

    I can't find the post I thought I just posted.

    Bush hogged today. Fun.

    Problem: Temp light came on after about 20 minutes.

    Before going out we had cleaned the screen in front of the radiator, blew out the air filter, and the level of the radiator water was fine.

    Came back inside and checked the manual and this forum.

    Will check flow @1500 rpm. Will flush it out.

    Any other suggestions?

    Thanks.

  2. #2
    Silver Member adjusterr's Avatar
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    Oct 2010
    Posts
    236
    Location
    Western Maryland
    Tractor
    Kubota L2500 & 1010 John Deere

    Default Re: Overheating

    If what you do doesn't work, check the thermostat. The temp light will have a sending unit, that might be bad. Does the engine seem hot or is the red light simply on?

  3. #3
    Super Member California's Avatar
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    Jan 2004
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    5,747
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Overheating

    If the overheating is real you may notice a burned smell. Don't open the radiator cap, that's the same as opening a pressure cooker! The top of the radiator shouldn't be to hot to touch for a moment unless you were running it real hard.

    Incidentally these need to be run at good speed, over 1800 rpm or preferably over 2000 to circulate coolant through the radiator when working hard. Pushing it hard at low rpm will cause overheating.

    I bought this little Harbor Freight infrared thermometer on sale under $10. Various parts of the radiator and engine show different temperatures but I've never found the radiator over 200 or the engine head over 250 except maybe right at the exhaust manifold. This can verify if you simply have a bad warning light sensor.

    This model Yanmar doesn't have a thermostat.

    One test you can perform is: with the engine cold then mid-warm, look in the radiator for bubbles (engine running) which would indicate a head gasket leak (or less likely, cracked head). Exhaust leaking into the coolant will overheat it quickly. This might be accompanied by loss of coolant too, but not necessarily. You should see water circulating, showing that the water pump is ok, but not bubbles.

    If there is any question of losing coolant be sure to spin the engine before starting using the compression release, to blow any water out of the cylinders since water is incompressible.

    It isn't unusual for these 30 year old tractors to have a plugged radiator. A radiator shop can likely rod it out, or a new radiator should be under $300.

  4. #4
    Bronze Member BurningBushFarm's Avatar
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    Nov 2010
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    99
    Location
    WNC
    Tractor
    YM2000D

    Default Re: Overheating

    I was making sure I was running at ~ 2400.

    I was in 5th, but then went to 3rd the second time out after I read about making making sure I was moving enough coolant through the radiator.

    If there is no thermostat what triggers the temp light?

    Thanks for the Harbor Freight tip.

  5. #5
    Super Member California's Avatar
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    Jan 2004
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    5,747
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Overheating

    A thermostat is a temperature-sensitive valve just before the upper radiator hose that holds water in the engine until the set temperature, maybe 170 - 190. Then it opens to let the coolant reach the radiator. But these old Yanmars don't have one.

    The warning light sensor is an electrical switch that closes around 235 degrees warning of imminent boil-over.

    And the radiator cap is nearly identical to a pressure cooker regulator - it holds pressure until 13 lbs. This allows up to some 240 - 250 degrees coolant temperature, still liquid, before it boils and spits out the coolant. Engines run more efficiently at higher temperatures.

  6. #6
    Elite Member
    Join Date
    Mar 2002
    Posts
    3,512

    Default Re: Overheating

    You should post your model # on every thread. The YM2000 runs notoriously cool, about 160*, and with all things right, should never overheat.
    I have a Ym2000B, with a factory temp gauge, and the first tool to go in my toolbox was a whisk broom. When mowing, as soon as I see any rise above normal on the gauge I know it is time to clean the rad screen. It normally never reaches the 1/4 mark.

  7. #7
    Platinum Member MikeInEburg's Avatar
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    Feb 2008
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    958
    Location
    Emmitsburg, MD
    Tractor
    Kubota B7800

    Default

    After years of brush mowing, the actual passages thru the radiator can become plugged. Even though we have the same debris screen, every five years or so I have to remove the radiator from the tractor and carefully hose out all passages. Huge difference.
    Mike

    "As you go through life, make this your goal: watch the donut, not the hole"

    Kubota B7800
    BH-75A Backhoe
    Rhino 60'' finish mower

  8. #8
    Super Member clemsonfor's Avatar
    Join Date
    Sep 2009
    Posts
    6,466
    Location
    Greenwood Co., SC
    Tractor
    Yanmar YM2000

    Default Re: Overheating

    Quote Originally Posted by adjusterr View Post
    If what you do doesn't work, check the thermostat. The temp light will have a sending unit, that might be bad. Does the engine seem hot or is the red light simply on?
    Have not read all posts so forgive me if i repost this.

    Your tractor does not have a thermostat.
    YM2000. MF dirt scoop,4' Jbar bushhog,boompole, LMC 12-16 disk harrow, 4' Atlas boxblade (with rippers). 1980 chevy K10,1990 ford ranger 2wd (285K miles),1997 saturn SL2 (twin cam!!),2001Toyota Higlander
    1986 Cobia 177 sunskiff w/1981 Johnson 60 hp
    1991 Javalen 17ft w/same year 150 Johnson GT
    Troybuilt 4 cycle & Echo 2 stroke,cold natured(need carb rebuild),MS390 Stihl, Northern tool pressure washer, mixes water into the oil in the pump(now dead, motor on a tiller). 5000 watt generator.

  9. #9
    Super Member clemsonfor's Avatar
    Join Date
    Sep 2009
    Posts
    6,466
    Location
    Greenwood Co., SC
    Tractor
    Yanmar YM2000

    Default Re: Overheating

    You have a problem, there is no reason to overheat at this temperature unless you have an issue. I would second a head gasket proble, maybe, or most likely a blocked radiator which basically means that only part of it will be cooling right with correct flow. Another thing is make sure your belt is not slipping, it needs to turn the same speed as the crank pully not be slipping causing the waterpump to turn at a slower speed.
    YM2000. MF dirt scoop,4' Jbar bushhog,boompole, LMC 12-16 disk harrow, 4' Atlas boxblade (with rippers). 1980 chevy K10,1990 ford ranger 2wd (285K miles),1997 saturn SL2 (twin cam!!),2001Toyota Higlander
    1986 Cobia 177 sunskiff w/1981 Johnson 60 hp
    1991 Javalen 17ft w/same year 150 Johnson GT
    Troybuilt 4 cycle & Echo 2 stroke,cold natured(need carb rebuild),MS390 Stihl, Northern tool pressure washer, mixes water into the oil in the pump(now dead, motor on a tiller). 5000 watt generator.

  10. #10
    Silver Member
    Join Date
    Mar 2008
    Posts
    208

    Default Re: Overheating

    Quote Originally Posted by clemsonfor View Post
    Your tractor does not have a thermostat.
    Does it have a water pump or convective flow? That will make a lot of difference in how to operate it.

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