Most common source is a ruptured diaphragm in the lift pump- you mentioned you changed the gaskets- did you rebuild the pump and put in a new diaphragm? Probably too much diesel getting into the crankcase to be blowby- rings would have to be so worn that compression would be affected and tractor would start hard and run poorly. About the only other source is leakage through the injector pump, and I don't know enough about that to comment.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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