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ECMN | If you run the tractor wide open do you think you could feel the blow by if you placed your hand on the ground directly below the tube? If not I would say you do not necessarily have excess blow by on that older engine. Drips on breather tubes are not that uncommon on a JD tractor engine of that era with reasonable blow by. Unless at idle you can feel pulsing from the tube from one cylinder I doubt you can determine that the engine will have a catastrophic failure if worked in the field. As far as it starting well when you have it plugged in for an hour and a half that is a fair bit of time for the block heater to warm up the engine in at least one area. If just the top of one or two cylinders near the heater have been brought up to the temperature that it normally starts at reliably in warmer/cool weather it will start. Once that cylinder fires and the cranking RPMs speed up the piston speed speeds up and raises the combustion air temp that the injector is introducing the fuel in. Then other cylinders follow suit firing even if they are not as warm as they would be in a regular ambient temp start. | |
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Blowby in 4620 tractor vs. good starting
