Was motoring out of the marina when a bunch of white smoke started coming out of the exhaust at the stern of the boat and the engine activity audibly increased. Closing the throttle did not immediately stop the engine as it usually does. It seems like this would be a "runaway" situation. Turned off electrical power to electric fuel lift pump and tried briefly covering air intake with a binder. The engine eventually stops, perhaps due to no additional diesel being sent by the electric lift pump (maybe?).
Upon inspection of the engine after the engine room smokiness clears, I seem to have some kind of black liquid leaking out of the exhaust elbow (see picture). Not sure if it's due to carbon build up blockage or something else. There is also black gunk inside the air intake so I am thinking maybe that was the unintended fuel source causing all the smoke. Checking the oil shows darker, smellier oil than usual. It seems like a good first step to remove the elbow to check inside (after the engine has cooled). To remove the elbow, do you actually have to rotate the entire elbow piece to unscrew it from the rest of the engine? There seems to be a throttle cable and a wall in the way which is making it hard to unscrew. Is there hope for this engine after this experience?
Upon inspection of the engine after the engine room smokiness clears, I seem to have some kind of black liquid leaking out of the exhaust elbow (see picture). Not sure if it's due to carbon build up blockage or something else. There is also black gunk inside the air intake so I am thinking maybe that was the unintended fuel source causing all the smoke. Checking the oil shows darker, smellier oil than usual. It seems like a good first step to remove the elbow to check inside (after the engine has cooled). To remove the elbow, do you actually have to rotate the entire elbow piece to unscrew it from the rest of the engine? There seems to be a throttle cable and a wall in the way which is making it hard to unscrew. Is there hope for this engine after this experience?
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