What are the causes of cylinder scuffing after an engine overhaul?
1 Answers
When cylinder scuffing occurs in an engine, the following are the detailed reasons for its occurrence: 1. Improper assembly during overhaul leading to cylinder scuffing. The components of a vehicle engine and their combinations are highly precise. Any improper assembly or coordination of parts (including piston rings and cylinder liners) during disassembly and overhaul, or prolonged high-speed or overload operation without proper break-in after the overhaul, can cause engine failures such as cylinder scuffing. 2. Poor air filter condition can lead to excessive engine wear and even cylinder scuffing incidents. 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 reciprocating motion of the piston, 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 significant harm to engines, and numerous vehicles in China undergo engine overhauls annually due to such failures. 3. Under normal circumstances, if the lubricating oil quality is poor, bearing seizure is more likely to occur earlier than cylinder scuffing. This is because bearing operating conditions are more demanding, requiring high-quality oil to ensure lubrication; whereas cylinder liners are made of better materials and, barring special circumstances, cylinder scuffing usually does not occur first. Cylinder scuffing incidents can be caused by mechanical failures or lubrication system issues, but they are less related to oil quality. The key lies in how the engine is maintained and used on a regular basis.
