I just purchased a used diesel generator at a Richie bros auction. It is a 7kw Kubota powered 1800rpm 3cyl engine, generator assembled by hardi diesel. 2500 hrs. I bought it for a good price, so I thought, with out being able to run it (dead battery). Oil and coolant looked good the thing looked brand new. Got it home charged it up, replaced a couple missing relays and bled fuel system. Got it to fire, watched the RPM climb past 1800 to about 2300 with no sign of stopping I snuffed the air intake with my hand and shut it down. Key switch and pulling the fuel line didn't work. After looking around I noticed the oil was milky white ie water, I'm assuming at that point from it sitting out and rain water going down the straight up exhaust pipe. I'm thinking I didn't notice it at auction because the water separated from the oil and didn't show on the dipstick? I was hoping the water added to the oil caused the volume in the oil pan to be so great that it pushed oil around the rings into the cumbustion chamber and making the engine run away?
I changed the oil and fired it up again same thing, this time very hard to shut down seemed like it was gonna suck the skin off my hand when I plugged the air intake with my hand. Took a lot to get it to shut down it would almost shut down then suck some air from a seem in the aircleaner and gain rpm. Seems like great compression. Pulled the aircleaner off noticed oil in the manifold that the aircleaner mounts to??
What should I do? The thing appears to be brand new I can't see how it could be worn out to the point of sucking oil around the rings to run away on? But I know nothing of the history and it could have ran its entire 2500hrs with out an oil change, but I doubt it. Where else could it be getting oil? One friend of mine is thinking a leaky valve guide seal? I don't have the engine model on me but can get it Monday when I'm at my shop. Do I need a complete rebuild? Should I pull head and have it pressure tested? Could it be governor related? Or some fuel pump seal leaking? Where do I start? Need help thought I found a good deal now I am starting to question this...
I changed the oil and fired it up again same thing, this time very hard to shut down seemed like it was gonna suck the skin off my hand when I plugged the air intake with my hand. Took a lot to get it to shut down it would almost shut down then suck some air from a seem in the aircleaner and gain rpm. Seems like great compression. Pulled the aircleaner off noticed oil in the manifold that the aircleaner mounts to??
What should I do? The thing appears to be brand new I can't see how it could be worn out to the point of sucking oil around the rings to run away on? But I know nothing of the history and it could have ran its entire 2500hrs with out an oil change, but I doubt it. Where else could it be getting oil? One friend of mine is thinking a leaky valve guide seal? I don't have the engine model on me but can get it Monday when I'm at my shop. Do I need a complete rebuild? Should I pull head and have it pressure tested? Could it be governor related? Or some fuel pump seal leaking? Where do I start? Need help thought I found a good deal now I am starting to question this...