What Causes Oil Spray from the Exhaust Pipe?

[SanIker]

It is normal for a diesel engine's exhaust pipe to have slight oil spray or a small amount of oil at the outlet. However, severe oil dripping from the exhaust pipe is abnormal. The exhaust pipe is usually connected to the crankcase or valve cover. Possible reasons include: 1. The crankcase ventilation valve is aging, or there is a malfunction in the piston, cylinder liner, piston pin, or piston rings, leading to a loss of sealing effect and causing oil spray. 2. Severe wear between the valve stem and valve guide creates excessive clearance, resulting in oil leakage downward. 3. The design itself has defects, leading to oil spray from the exhaust pipe.