Classroom explanation of auto parts knowledge

Eight Points for Attention in the Purchase of Auto Parts

　　 1. See if the trademark logo is 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. Product names, specifications, quantities, registered trademarks, factory names, addresses and telephone numbers, etc., should be carefully identified when purchasing to prevent buying fake and shoddy products.

　　2. See if there is any deformation of the geometric dimensions. Some parts are prone to deformation due to improper manufacturing, transportation, and storage. When purchasing various types of gaskets, attention should also be paid to checking the geometric dimensions and shapes.

　　3. Check whether the joint is smooth. During the transportation and storage of spare parts, due to vibration and bumps, burrs, indentations, breakages or cracks are often generated at the joints, which affects the use of parts. Pay attention to inspection when purchasing.

　　4. Check whether there is rust on the surface of the part. The surface of qualified parts has both a certain precision and a bright finish. The more important parts are, the higher the precision, and the stricter the rust and corrosion protection of the packaging.

　　 5. See if the protective surface is intact. Most parts are coated with a protective layer when they leave the factory. If it is found that the sealing sleeve is damaged, the packing paper is lost, or the anti-rust oil or paraffin wax is lost during the purchase, it should be returned.

　　 6. Check whether the glued parts are loose. For accessories composed of two or more parts, the parts are press-fitted, glued or welded, and no looseness is allowed between them. If looseness is found during purchase, it should be replaced.

　　7. See if the rotating parts are flexible. When purchasing a rotating part assembly such as an oil pump, turn the pump shaft by hand to feel flexible and free of jamming. When purchasing a rolling bearing, support the inner ring of the bearing with one hand and turn the outer ring with the other. The outer ring should be able to rotate quickly and freely. Gradually stalled.

　　 8. See if there are any missing parts in the assembly. The regular assembly parts must be complete and intact to ensure smooth assembly and normal operation. If the individual small parts on some assembly parts are missing, the assembly parts will not work or even be scrapped.