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  1. 01-25-2013, 02:23 PM #1
    mjdupre
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    Yanmar 1500 (Red)

    Default 1500 loses power when hot

    I have a 1500 that starts like a champ but once it gets hot it loses power.
    I suspected the head gasket, coolant looks really dirty shortly after I changed it though I don't see any coolant in the oil.
    Assume that a quick compression test on it may shed some light, though the fact that it starts easy leads me to believe that the compression is fine.

    Anyone have any idea what sort of compression these should have?
    How do you go about checking the compression on a diesel ????? (no seriously how ??)
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  3. 01-25-2013, 02:51 PM #2
    kenmac
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    Default Re: 1500 loses power when hot

    Quote Originally Posted by mjdupre View Post
    I have a 1500 that starts like a champ but once it gets hot it loses power.
    I suspected the head gasket, coolant looks really dirty shortly after I changed it though I don't see any coolant in the oil.
    Assume that a quick compression test on it may shed some light, though the fact that it starts easy leads me to believe that the compression is fine.

    Anyone have any idea what sort of compression these should have?
    How do you go about checking the compression on a diesel ????? (no seriously how ??)
    Hot as in temp light on hot?? Doubt you have a comp. problem as, you state it starts right up. To check comp. you have to pull injectors. Hoye sells a test kit
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  4. 01-25-2013, 05:31 PM #3
    winston1
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    Default Re: 1500 loses power when hot

    Crank it cool with the radiator cap off and watch for bubbles in the radiator. Bubbles will indicate a bad head gasket. Is your level in your overflow bottle staying the same? Starting right up is a good indication there is nothing wrong with your compression.
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  5. 01-26-2013, 11:51 AM #4
    clemsonfor
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    Default Re: 1500 loses power when hot

    how old is your fuel filter?
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  6. 01-26-2013, 07:21 PM #5
    careyo63
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    Default Re: 1500 loses power when hot

    Quote Originally Posted by clemsonfor View Post
    how old is your fuel filter?
    No mention of any loss of Antifreeze. A bad HG. you usally have a Loss of Antifreeze.Out the Exhaust or in the oil. If no loss of Antifreeze and your not pressuring up the Radiator. No mention of that is why I agree with Clemsonfor. Whats up by the way!!!!
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  7. 01-27-2013, 09:00 AM #6
    clemsonfor
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    Default Re: 1500 loses power when hot

    We don't know if he has antifreeze loss or not, so not knowing that is why I just thinking filter maybe??
    Bad filter will cause loss of power.
    Been doing good, busy here with work. Staying warm in this cool snap?
    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
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    1991 Javalen 17ft w/same year 150 Johnson GT
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  8. 01-27-2013, 10:31 AM #7
    careyo63
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    Default Re: 1500 loses power when hot

    Staying warm in this cool snap?[/QUOTE]
    Have to. Still about like Sunlight to a Vampire.
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  9. 01-27-2013, 04:56 PM #8
    kenmac
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    Default Re: 1500 loses power when hot

    Well, he hasn't been back so, I guess it's not too important
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