I've got a Perkins
4108 diesel engine
with unknown hours. Had it inspected last year when I bought the boat and it passed with flying colors. I've not used the engine
much since, but run it about once every couple of weeks as a matter of routine.
A few weeks ago when I checked the oil
level it was higher than the recommended level and the oil
seemed thinner. The oils color was black but didn't smell particularly different from other oil. So I pumped out the excess oil until it was exactly at the required level. Today I checked the oil level and, again, it was above the required level. Still black in color but smells kind of like lighter fluid. I ran the engine for a few minutes and noticed a small sheen of fuel
coming out of the exhause. I also noticed that one of the brass fuel
line connections (between the tank and the fuel pump
, but in the engine compartment) has a very minor leak. I can only think of two things that would cause the oil level to rise, a blown head
(allowing coolant/water into the oil pan) or a fuel leak. I suspect that somehow fuel is leaking into the cylinders while the engine is turned off, and that fuel is ending up in the oil pan.
Any idea what might cause this and how do I fix it? Could it be that minor leak in the fuel line? Or a defective fuel pump