First, the engine cylinder seal detection
There are seven factors that affect the seal of the cylinder, mainly the wear of the cylinder, the piston ring damage, piston wear, valve seat damage, valve tube wear, cylinder pad damage, valve clearance and other aspects of the problem.
What are the commonly used diagnostic methods? Mainly measuring the cylinder pressure, crankcase blowout gas, cylinder leakage and leakage rate, intake pipe vacuum, cylinder piston group due to excessive wear caused by abnormal vibration measurement, the crankcase wear metal is the particle content Of the determination.
For cylinder compression pressure measurements, the pressure is mainly the four-stroke engine compression end. The cylinder piston group can be diagnosed when measuring the pressure of the engine cylinder due to the pressure of the cylinder and the viscosity of the oil and the cylinder piston group, etc., the adjustment of the air distribution mechanism is correct, the sealing of the cylinder pad, etc. Of the sealing situation, if the piston ring, valve, cylinder pad seal if good, then the valve clearance must be appropriate.
Second, silencer firmness detection
Muffler with outer cylinder and the internal honeycomb structure, two parts due to high temperature, vibration and other special environment is by mechanical package buckle process together. We know that the quality of this process depends on the design of the precision, if the combination is not strong in the car will be due to high temperature, vibration and other factors caused by loose or fall off. But let us be assured that the quality of the first sector has been on the technical aspects of the very stringent requirements.
For the actual detection method industry testing tools are using universal testing machine, with a pressure plate fixture, so that the two components of the muffler from the upper and lower shear force. The measured results should be less than 5%.
Third, interior testing
The interior includes a seat forming material, a car interior trim and a sticky adhesive. Mainly to detect its safety: 1. Gas harmful 2. Flame retardant.