1. Introduction
Scuffing is a common automobile engine failure. The so-called “Scuffing” refers to a cylinder inner wall is pulled into deep grooves, piston, piston ring and cylinder wall friction loss of tightness, resulting in the compression cylinder pressure is reduced, power loss; lower crankcase blow-combustible gas mixture pressure increases, the crankcase can cause serious explosion; cause oil burning phenomena occurring within the cylinder went to the lubricating oil; severe smoke exhaust duct; abnormal engine noise; engine stall does not even work. Scuffing mainly automobile engine failure is:
2 due to
1, the engine cooling system due to leakage, water, caused by failure to replenish engine overheating; [123 ]
2, piston rings breaking, scratch the cylinder wall;
3, piston pin collar off, scratch the cylinder wall;
4, due to carbon deposition stuck piston rings in annular groove, the loss of sealing effect;
5, piston pin out, scratch the cylinder wall;
6, the foreign matter enters the cylinder;
7, the piston and cylinder wall the gap is too small;
8, piston pin assembly too tight, causing deformation of the piston;
9, thermal deformation of the piston top severe burn or melt;
10, the engine length time high speed or overload and so on.