First, the engine cylinder sealing test

There are seven factors affecting cylinder sealing, mainly cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide wear, cylinder gasket damage, valve lash and other aspects of the problem.

What are the common diagnostic methods ni? There are mainly measurements of cylinder pressure, crankcase blow-by, cylinder leakage and leakage rate, intake pipe vacuum, vibration measurements of rattles caused by excessive wear of the cylinder piston group, and determination of the content of particles of wear metals in the crankcase.

The measurement of cylinder compression pressure is mainly the pressure at the end of compression in a four-stroke engine. Due to the cylinder pressure and the viscosity of the oil and the cylinder piston group and so on with the situation, whether the adjustment of the gas distribution mechanism is correct, the cylinder gasket sealing and other aspects of the factors, so, in the measurement of the engine cylinder pressure, you can diagnose the sealing situation of the cylinder piston group, if the piston ring, the valve, the cylinder gasket sealing if good, then the valve lash should be appropriate.

Second, the muffler firmness test

Silencer has an outer cylinder and internal honeycomb components, the two parts of the high temperature, vibration, and other special environments is to rely on the mechanical package buckle process combined together. If the combination is not firm, it will loosen or fall off due to high temperature, vibration and other factors in the use of automobile. However, we can rest assured that the relevant quality departments have put forward quite strict requirements on the technical aspects.

For the actual test method industry testing tools are used in the material testing machine, with the pressure plate fixture, so that the silencer two components by the upper and lower relevant shear force. Measured results should be less than 5% repeatable error.

Third, the interior testing

Interior trim including seat formation materials, interior box decorative materials and adhesive bonding with sticky.