What Causes Black Smoke from Diesel Engine Exhaust?

[VanOmar]

Diesel engine exhaust emitting black smoke may be caused by the following reasons and solutions: 1. Exhaust pipe blockage. Solution: If the exhaust pipe is blocked by excessive soot, it should be cleaned. 2. Incorrect valve clearance adjustment or poor valve sealing line contact. Solution: Check the valve clearance, valve springs, and valve sealing condition. 3. Uneven or excessive fuel supply from the high-pressure fuel pump to each cylinder. Solution: Adjust the fuel supply to achieve balance or keep it within the specified range. 4. Delayed fuel injection. Solution: Adjust the fuel injection timing advance angle. 5. Poor performance or damage of the fuel injector. Solution: Remove, clean, and inspect the fuel injector. 6. Incorrect fuel injector model selected. Solution: Replace with the correct model of fuel injector. 7. Poor diesel quality or incorrect grade. Solution: Use clean and qualified light diesel. It is recommended to choose diesel grades as follows: No. 0 or +10 in summer; -10 or -20 in winter; and -35 in extremely cold regions.