If it is full to the filler cap it must be diesel getting in the crankcase, on your fuel pump there should be a thumb lever to manually prime fuel after changing fuel filters etc. With the engine shut off, pull the dipstick or the fill cap and manually pump fuel, if the crankcase overflows then your fuel pump diaphragm is probably bad which is cheap fix plus oil change. If it is internal engine problem -- rings, piston or something then there should be other symptoms -- rough running, obvious smoking -- it could be the injector pump gear seals but then it should run weak and be hard to crank.I would advise against running the engine very much until you figure it out because the diesel will lower your oil viscosity.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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