What are the causes of engine cylinder scoring?
1 Answers
There are several reasons for engine cylinder scoring: 1. Hard objects falling into the combustion chamber. 2. Intake or exhaust valve spring breakage, causing the valve to drop into the cylinder. 3. Replacement pistons with incorrect geometric dimensions during major overhaul. 4. Excessive thickness of replacement connecting rod bearings or gaskets during major overhaul. 5. Failure to form an oil film between the cylinder wall and piston rings/piston, resulting in poor lubrication or even dry friction. Engine cylinder scoring refers to noticeable longitudinal mechanical scratches and abrasions on the cylinder wall within the piston ring's movement range. In severe cases, it can lead to adhesive wear, causing difficulties in engine starting or spontaneous stalling. Cylinder scoring is a major engine failure.