What Causes White Smoke from Diesel Engines?
2 Answers
The following are the possible reasons for white smoke from diesel engines: 1. Incomplete combustion of diesel: The diesel evaporated in the combustion chamber does not burn completely; 2. Coolant entering the cylinder: The engine consists of: valve train; crankshaft connecting rod mechanism; ignition system; cooling system; lubrication system; fuel supply system. 3. Engine maintenance items: Regularly change engine oil and oil filter; maintain good crankcase ventilation; clean the crankcase regularly; clean the fuel system regularly; maintain the radiator regularly; maintain and clean the fuel system. 4. Function of the engine: Convert the thermal energy of gasoline or diesel into mechanical energy by expanding gas after combustion in a sealed cylinder, thereby pushing the piston to do work.
I once encountered a situation where my diesel engine emitted white smoke, which happened while driving in winter. The smoke was particularly thick after starting, and I initially thought it was a normal phenomenon due to the cold weather. However, when it persisted, I began to worry. After inspection, it turned out to be mainly an issue of incomplete combustion, caused by several factors: water mixed into the fuel, especially during humid seasons or when using poor-quality fuel; or a damaged cylinder head gasket, allowing coolant to seep into the combustion chamber, where it evaporates into white smoke under high temperatures. Additionally, faulty fuel injectors or a malfunctioning high-pressure pump can cause uneven fuel spray, increasing the risk of white smoke. At the time, I drove to a repair shop for diagnosis, and the technician recommended always using high-quality diesel from reputable gas stations and avoiding sudden acceleration in low temperatures. Ignoring the issue could lead to engine overheating or even a blown engine, resulting in costly repairs.
