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White Smoke from Older Diesel at Higher RPMs
The engine in my boat is the original Volvo MD17D from 1985. All indications are that the engine has always been regularly maintained, has fairly low hours for its age (about 1500), and has neither required nor undergone any major surgery. The engine looks, starts, stops, runs, and sounds very well. The Volvo manual specs the engine at 3000 RPM, but I alway run it below 2500 RPM, usually at 2200 to 2300.
Once warm, the engine exhaust does have a very small amount of gray smoke when running between 1800 and 2300 RPM. Above 2400 or 2500 RPM, though, a larger amount of white smoke is visible in the exhaust.
Both the 2 micron Racor and the fine Volvo/Bosch filter on the engine are clean and almost new. Coolant and oil seem OK.
Any experience to suggest the cause of the white smoke?