Question about John Deere 420,1020,2010,2020,2510,2520 Tractor Float

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I have a 1969 John Deere 4020 that is cold blooded. It turns over fast, but won't start without being pluged in or using ether below 70 degrees. What are the potential problems?

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Cylinder Compression Low, Valves worn ... not seating properly, valve stems.
Injector nozzles worn ... dribbling rather than precise squirts, injection pump worn.

First and easiest thing to do: pull all nozzles and have them tested, pull the injection pump and have it rebuilt and re-calibrated.
*NOTE: you can pull these, but are components that proffessional need to rebuild and calibrate. Truck shop, or farm tractor shops have places that specialize in this type of work.

If it is gasoline, I would look towards pistons, rings, valves.

Posted on Nov 12, 2009

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Posted on Jan 02, 2017

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