If the vent system is restricted for any reason, this can build up excess crankcase pressure that will force oil up past the piston rings and cause oil burning and the resultant blue smoke. Is your crankcase breather system plugged or blocked? Any engine needs to breath. This needs to be corrected ASAP, otherwise engine crankshaft seals are at extreme risk of damage as crankcase pressure could end up being high enough to invert these seals and cause major damage.
#MARINE DIESEL ENGINE COOLANT STOP LEAK FULL#
If the reading you get is above the full mark, you or someone else may have added too much oil to the engine. Did you overfill the engine’s crankcase with oil? Check the oil dipstick. Your engine may be near the end of its useful service life. In either case, an experienced mechanic will be needed to make a definitive diagnosis. With a high-hour engine, things like valve seals and piston rings that are worn out can be a cause for excess blue smoke emission from your exhaust.
If you do see blue smoke, here are some of the possibilities. As for oil smoke in a diesel, you shouldn’t expect to see any of that until the engine has many, many hours of run time and is nearing the end of its life expectancy. With modern engines, either two- or four-stroke, there should be no reason to see smoke from the exhaust. The big question here should be “where’s the oil coming from?” In the old days of two-cycle outboard engines, before computer controls and super-precise oil injection systems, outboards could be smoky beasts. Blue Smoke Most people who have owned engines have probably heard that blue smoke is generally indicative of oil burning within the engine’s combustion chambers. It may take some detective work to figure out the cause.
This boat has a bad case of black smoke, a sure sign of excess, partially combusted fuel.
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