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  1. #1
    Sr. Apprentice Bikeman's Avatar
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    Apr 2009
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    Charlotte NC
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    Default Help with John Deere diesel?

    Maybe not the right venue but figure worth a shot. I have a mid 80s John deere diesel, 2 cylinder. I'm not sure off hand what model but its larger than a lawn tractor but not as big as a farm tractor.

    Anyway, after it gets warm it runs bad, gets leaner and leaner till finally it will quit after about 25 minutes. I'm thinking its the injection pump. I have changed all the obvious stuff...fuel filter, air filter etc...

    thoughts and ideas would be great.

    Thanks

  2. #2

    Default

    Check for air leaks into the low pressure fuel side. Before the filter. replace any cracked hoses.

  3. #3

    Default

    Let the engine get up to temp and spray a little WD-40 around the intake manifold gasket. Be careful not to let your spray go into the air filter as that would give you a false reading. If you have a leak the engine should respond by a change in RPM. Sounds like you're getting an intake leak after the metal expands.

    2009 Crew Cab Colorado
    Lowered 3" front and back
    Xenon body kit (sides only) with stock bumpers
    Snug Fit smooth side cap
    Custom paint
    Custom powder coated Boss 20" rims
    Toyo tires

  4. #4
    Legend Mean_Green_95's Avatar
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    Apr 2009
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    Baton Rouge, Louisiana, United States
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    Default

    Make sure your fuel bowl is seated properly. My '95 Deere 1070 actually caught an air bubble in the secondary bowl and wouldn't let the system get primed.
    2010 Equinox LT
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    1995 Cheyenne C1500 ext. cab(my baby, my first truck)
    5.0, 5 speed, Silverado appearance package, power nothing, bucket seats and console Silverado, painted black interior, eBay halo headlights, eBay chrome tails, eBay cai, dual Flowmaster 40's w/no cats, 15x7 American Racing Hopsters, Walmart fog lights, SS mirrors

  5. #5
    Jr. Apprentice
    Join Date
    Mar 2009
    Location
    Edgerton, OH
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    22

    Default

    As someone that has owned 5 Merc diesels I can tell you of some fuel supply oddities. You could have a hair line crack in a line or seal. I had a situation where I had a very fine crack in an o-ring. For the most part it would run OK. When, you started it was fine, but a few minutes later it was sucking air for a few seconds causing loss of power until it made it through the air gap (self priming pump).
    1997 K1500 Silverado 5.7L
    1985 MB 300D 'Margaret' 253,000 miles
    1985 MB 300D California version 'Maybellene' 268,000 miles (death by deer at high speed)
    1981 MB 300D 'Madeline' 238,000 miles
    1991 MB 300SE 'Alarice' 158,000 miles

  6. #6
    Sr. Apprentice Bikeman's Avatar
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    Default

    Thanks, I will check those items today and with some luck be able to do some yardwork.

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