Auto parts performance testing

  Sealing test of engine cylinder

  There are seven factors that affect the tightness of the cylinder, mainly including cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide tube wear, cylinder gasket damage, valve clearance and other aspects.

  What are the commonly used diagnostic methods? It mainly measures the cylinder pressure, crankcase blow-by volume, cylinder leakage volume and leakage rate, intake pipe vacuum, and vibration measurement of the abnormal noise caused by excessive wear of the cylinder piston group. The wear metal in the crankcase is the particle content Of determination.

  For the measurement of cylinder compression pressure, it is mainly the pressure at the end of four-stroke engine compression. Due to factors such as the pressure of the cylinder, the viscosity of the engine oil, and the cylinder piston group, whether the adjustment of the valve train is correct, the tightness of the cylinder gasket, etc., when measuring the pressure of the engine cylinder, the cylinder piston group can be diagnosed If the sealing performance of the piston ring, valve and cylinder head gasket is good, the valve clearance should be appropriate.

  Second, the silencer soundness detection

  The muffler is composed of an outer cylinder and an inner honeycomb. The two parts are combined together by mechanical buckling process due to the high temperature and vibration. We know that the quality of this process depends on the precision of the design. If the combination is not strong, it will be loose or fall off due to high temperature, vibration and other factors in the use of the car. But let us rest assured that the relevant quality department has put forward quite strict requirements on the technical aspects.

  For the actual testing method, the testing tools in the industry all use material testing machines, and use pressure plate clamps to subject the two components of the muffler to related up and down shear forces. The repeat error of the measured result should be less than 5%.

  Three, interior inspection

  The interior includes materials for forming seats, decorative materials for interior boxes and adhesives for bonding. Mainly check its properties: 1. Gas harmfulness 2. Flame retardancy.