What Causes Oil Spray from the Exhaust Pipe of a Weichai Engine?

[StNathan]

Reasons for oil spray from the engine exhaust pipe: 1. Cylinder: Blow-by gas in the cylinder causes oil spray. 2. Breather: A clogged or damaged crankcase breather leads to oil spray. 3. Pressure: Excessive crankcase pressure results in oil spray. 4. Ventilation valve: Oil spray from the engine exhaust pipe is likely due to aging of the crankcase ventilation valve. 5. Piston pin and piston ring failure: Loss of original sealing effect causes oil spray. More relevant information is as follows: Note 1: While driving, try to keep the engine speed below the red mark on the tachometer. Avoid overloading the engine, and for manual transmission vehicles, refrain from lugging the engine. Note 2: Preheat the engine before cold starts. Only by ensuring the engine operates at normal temperature can the operational resistance, wear, and stability between components reach optimal conditions. Note 3: Refuel immediately when the fuel tank is down to one-third of its capacity to ensure proper heat dissipation of the fuel pump inside the tank, thereby guaranteeing a sufficiently long service life for the fuel pump.