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over-revving the engine can cause it, i think it is most common with the 2stroke diesels, but im pretty sure it can happen to most if not all. basicaly the motor has no butterfly to shut down air to the motor, (like a gas engine), and since it doesnt need spark, there is no way to stop the ignition of fuel.. once it reaches a certain RPM, it pulls combustible fluids from wherever it can. ive heard of turbo seals blowing, and motor running on its own oil, and also i believe the motor if revving fast enough can suck oil through the valve seals, etc... (maybe even pull fuel through weak injectors?)
I talked to a guy that over revved a brand new rebuild because on iniitial startup its sucked a bunch of oil out of the intercooler that had apparently been deposited there when it originally blew up. Apparently its pretty easy to do if you are not careful....
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