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Help with John Deere diesel?

Discussion in 'General Chevy & GM Tech Questions' started by Bikeman, May 26, 2009.

  1. Bikeman

    Bikeman New Member

    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. Z71pilot

    Z71pilot New Member

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

    powdercoater New Member

    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.
  4. Mean_Green_95

    Mean_Green_95 New Member 1000 Posts

    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.
  5. ncof300d

    ncof300d New Member

    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).
  6. Bikeman

    Bikeman New Member

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

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