Posted by fixerupper on February 26, 2008 at 20:13:47 from (216.51.182.132):
In Reply to: john deere 620 problems posted by Caleb in pa on February 26, 2008 at 16:40:44:
Worn valve guides will cause it to smoke out the muffler when the throttle is pulled back. Worn compression rings will cause crankcase pressure and blowby. Sometimes the compression rings can be leaking compression but the oil rings will still be good enough to keep the oil consumption down to an acceptable level.
I had a tractor that had a fair amount of blowby at idle but no blowby under a load. I was told by a mechanic that when it was loaded the increased combustion pressure would force the compression rings out against the cylinder walls and help them to seal better. Jim
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