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The nozzle will leak and let fuel squirt into the intake manifold. No one really knows how the fuel gets into the crankcase but it does. I capped off the two fuel lines going to the nozzle and put a couple of pipe plugs in the nozzle itself. Look at your intake manifold. You'll see a sparkplug...

Do you have the manifold fuel heater? That's how my deuce made oil. But on the bright side, I bet that gallon of diesel in there helped clean the crankcase.