What Are the Causes of Black Smoke from Diesel Vehicles?
1 Answers
Here are the reasons why diesel engines emit black smoke: 1. Fuel supply system factors: 1.1 Fuel injector: Fuel injector dripping, poor atomization, or insufficient injection pressure; 1.2 Fuel injection pump: Wear of the fuel injection pump plunger or delivery valve, insufficient common rail pressure, or excessive fuel supply; 1.3 Injection timing: Incorrect injection advance angle. 2. Combustion system factors: 2.1 Valve clearance: Incorrect valve clearance; 2.2 Piston rings and cylinder liner: Severe wear of piston rings and cylinder liner, leading to insufficient compression pressure; 2.3 Piston top clearance: Improper adjustment of piston top clearance, resulting in too low compression ratio. More related information is as follows: Notes: Black smoke from direct-injection diesel engines cannot be completely avoided. However, if the engine emits thick black smoke under normal load without overload, it is abnormal and requires further inspection.