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 - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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