The fact that it ran away a couple times is concerning, if you could stop it by shutting it off with the key that indicates that it isn't ingesting oil from somewhere else, but probably due to a malfunctioning injector pump, or it could be a governor.
Well, Got it started yesterday. it ran fine for about 5 minutes or less and then it started reving really high and blowing alot of smoke. And it looks like it is blowing some type of oil out of the tali pipe and on the engine. got to shut down. waited a about 20 minutes started it back up and it ran fine again for about 3 minutes and then started reving and smoking again. parked it and left it alone . IS this thing shot or could it be something fixable? I never had a diesel engine before so i don't know what to look for?
How old if the fuel? I see you were looking for a filter, did you change it with the new one filled. Sounds like a leak before the pump but could be the Governor like the previous person said.
Fuel is new. The old fuel filter was not even dirty but i replaced it anyway. It doesn't seem to want to shut off . it shut off by itself while reving really high and smoking alot of really thick smoke. . left it sit for awhile, its started right up and did not smoke . i just parked it. i am sure it would start reving high and smoking again if i keeo it running. i don't know what to look for. Very scary when it it does this and you can't get it to shut off.
Is it a turbo motor? if the seals are bad, it could be sucking up oil, making it run away and smoking badly, it would explain the oil out the exhaust too.....
Anyone know if there is a PCV valve on a 3610 gehl diesel? if so where might it be on the engine. Someone told me to check it went bad?
Here is the manual for the next size up from yours, it might help. https://www.manualslib.com/manual/837457/Gehl-Sl3640e.html