what could be the reason for a mazda bongo b 2200 engine to produce white smoke

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i was crossing through a a river that had water and the water was covering the diesel filter and car just cut and could not start. i only manged to start it the next day but the engine was vibrating and producing white smoke which only cleared after travelling about 30 kilometers. the car has power but now its producing a smoke and in the morning i tend to see a white smoke when i start the engine