What are the symptoms of cylinder scuffing in a diesel engine?
1 Answers
Diesel engine cylinder scuffing symptoms include a drop in RPM, reduced power output, and in severe cases, the engine may stall on its own. After stalling, it becomes difficult or impossible to crank the engine manually; the diesel engine emits heavy abnormal noises; the cooling water temperature, cylinder temperature, and oil temperature rise significantly; smoke emerges from the crankcase, and a burnt oil smell can be detected. Below are the reasons for diesel engine cylinder scuffing: 1. Improper assembly during overhaul leading to cylinder scuffing: The vehicle's engine and its components are precisely matched. Any improper assembly or coordination of parts (including piston rings and cylinder liners) during a major overhaul, or prolonged high-speed or overload operation without proper break-in after the overhaul, can cause engine failures such as cylinder scuffing. 2. Air filter: A poor air filter can lead to excessive engine wear and even cylinder scuffing accidents. The reason is that dust in the air can pass through a faulty air filter into the combustion chamber and be carried into the crankcase by the piston's reciprocating motion, mixing with the lubricating oil. The dust mainly contains silicon compounds, which are harder than the cast iron or steel piston rings and cylinder liners, thus causing cylinder scuffing. Therefore, dust poses a significant hazard to the engine, and numerous vehicles in China undergo engine overhauls annually due to such failures.
