What causes black smoke from a Weichai engine when accelerating?
1 Answers
The reasons for black smoke appearing momentarily when accelerating a Weichai engine are as follows: 1. Combustible mixture: The combustible mixture is too rich. 2. Engine oil quantity: Excessive engine oil in the fuel. 3. Piston rings or crankshaft: Poor sealing of piston rings or crankshaft oil seals. 4. Fuel: Presence of water in the fuel. 5. Spark plugs: Faulty spark plugs. Fault diagnosis and troubleshooting: 1. Inspection and diagnosis of an overly rich combustible mixture: Focus on checking the carburetor and air filter. 2. Incorrect mixing ratio of mixed oil and engine oil: Or using the wrong grade of engine oil. If the mixed oil contains too much engine oil or the engine oil quality is poor, the engine oil in the combustible mixture cannot burn completely, resulting in black smoke. For two-stroke engines with separate lubrication systems, an improperly adjusted oil pump supplying too much oil can also cause this phenomenon. In this case, the oil pump should be inspected and adjusted as per regulations to ensure proportional supply of lubricating oil at different throttle openings. 3. Excessive wear or breakage of four-stroke engines, as well as excessive oil in the crankcase: Both can cause oil to enter the combustion chamber, leading to excessive oil in the mixture. If the crankshaft oil seal of a two-stroke engine is damaged, it can also allow oil from the transmission to enter the crankcase and subsequently the combustion chamber with the mixture.
