There are seven factors that affect cylinder sealing, including cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide wear, cylinder gasket damage, valve clearance and other issues.
For the measurement of cylinder compression pressure, it is mainly the pressure at the end of compression in a four-stroke gasoline engine. Due to factors such as the cylinder pressure and the viscosity of the engine oil, as well as the cylinder piston group, whether the adjustment of the valve mechanism is correct, the sealing of the cylinder gasket, etc., when measuring the pressure of the cylinder of a Petrol Car engine, the cylinder can be diagnosed. The sealing condition of the piston group, if the piston ring, valve, and cylinder gasket sealing is good, then the valve clearance must be appropriate.
2. Muffler firmness testing
The muffler is composed of an outer cylinder and an inner honeycomb part. The two parts are combined by a mechanical wrapping process due to the special environment such as high temperature and vibration. We know that the quality of this process depends on the precision of the design. If the connection is not firm, it will loosen or fall off due to high temperature, vibration and other factors when using Roewe Car. However, what reassures us is that the relevant quality departments have put forward quite strict requirements on this technical aspect.
For the actual testing method, the testing tools in the industry use a universal material testing machine and a pressure-resistant disc clamp to subject the two components of the silencer to the upper and lower related shear forces. The repeatability error of the measured results should be less than 5%.
3. Interior inspection
The interior includes seat forming materials, interior box decoration materials and bonding adhesives. Mainly detect its safety:
① Harmful nature of gas
②Flame retardancy.