See auto parts if the trademark signs are complete. The outer packaging of the authentic product is of good quality, the handwriting on the box is clear, and the overprint color is bright.
Packing boxes and bags should be marked with product name, specification model, quantity, registered trademark, factory name, address and telephone number, etc.
Some manufacturers also put their own marks on the accessories. Some important components, such as generators, distributors, fuel injection pumps, etc.
Are also equipped with instruction manuals, certificates of conformity and inspector stamps to guide users in proper use and maintenance.
When purchasing, you should carefully recognize it to prevent you from buying fake and shoddy products.
See if there is any deformation of the geometric dimensions. Some parts are prone to deformation due to improper manufacturing, transportation, and storage.
When inspecting, you can roll the auto parts along the glass plate to see if there is light leakage at the joint of the part and the glass plate to judge whether it is bent; when choosing the clutch driven disc steel plate or friction plate, you can use the steel plate and friction plate.
Hold the sheet in front of your eyes to observe whether it is warped; when purchasing an oil seal, the end face of the oil seal with a skeleton should be in a perfect circle.
Which can be attached to the plate glass without bending; the outer edge of the non-frame oil seal should be straight and deformed by hand , It should be able to return to its original state after letting go.
See if the joint is flat. During the transportation and storage of spare parts, due to vibration and bumps, burrs, indentations, breakages or cracks are often generated in the joints, which affect the use of parts. Pay attention to check when purchasing.