What's the best way to shop for auto parts products?

First, see if the trademark logo is complete. Authentic products have good quality outer packaging, clear handwriting on the box, overprinted in vivid colours. On the box, bag, should be marked with the product name, specifications, quantity, registered trademark, factory name and address and telephone number, etc. Some manufacturers also play their own mark on the accessories. Some important components such as generators, distributors, injection pumps, etc., but also with the use of manuals, certificates of compliance and inspectors chapter, in order to guide the user to use the correct maintenance. Selection should be carefully identified to prevent the purchase of counterfeit and shoddy products.

Second, look at the geometry of the size of the deformation. Some parts due to manufacturing, transportation, storage improper, easy to produce deformation. Check, you can roll the shaft parts along the glass plate a circle, see the parts and glass plate fit at the light to determine whether bending; purchase clutch disc steel or friction plate, you can steel, friction plate in front of the eyes to observe whether it is warped; in the purchase of oil seals, with a skeleton oil seal end face should be positive round, can fit with the flat glass without deflection; no skeleton oil seal outer edge should be square, with the hand to make its deformation, after releasing the hand should be able to restore the original state. After releasing the hand, it should be able to recover its original shape. When purchasing various types of gaskets, attention should also be paid to checking the geometric size and shape.

Third, see if the combination of parts is flat. Parts in the handling, storage process, due to vibration, bump, often in the combination of parts produced burrs, indentation, damage or cracks, affecting the use of parts. Attention should be paid to check when selecting and purchasing.

Fourth, look at the surface of the parts have no rust and corrosion. Qualified spare parts surface, both a certain degree of precision and bright finish, the more important spare parts, the higher the precision, the more stringent the packaging rust corrosion prevention. The more important the spare parts, the higher the accuracy, the stricter the packaging against rust and corrosion. When selecting and purchasing, attention should be paid to checking if the parts are found to have rust spots, mould spots or cracked rubber parts, loss of elasticity, or the surface of the journals have obvious turning patterns, they should be exchanged.

Fifth, see whether the protective surface layer is intact. Most parts in the factory are coated with a protective layer. Such as piston pins, shaft tiles with paraffin protection; piston rings, cylinder liner surface coated with rust-proof oil and wrapped in wrapping paper; valves, pistons, etc. after dipping rust-proof oil with a plastic bag package. If you find that the sealing sleeve is damaged, the wrapping paper is lost, the rust-proof oil or paraffin wax is lost, it should be returned.

Sixth, see if the glued parts have loosened. By two or more parts into a combination of accessories, parts are pressed, glued or welded between them, they do not allow loose phenomenon, such as oil pump plunger and adjust the arm is through the pressure of the combination; clutch driven wheel and steel plate is riveted combined, the friction plate and steel plate is riveted or glued; paper filter cartridge skeleton and filter paper is glued into the; electrical equipment wire is welded. If you find any looseness when selecting and purchasing, it should be exchanged.

Seven, see whether the rotating parts are flexible. When purchasing oil pump and other rotating parts assembly, turn the pump shaft by hand and feel flexible without stalling; when purchasing rolling bearings, support the inner ring of the bearing with one hand and turn the outer ring with the other hand, the outer ring should be able to rotate quickly and freely, and then gradually stop turning. If the rotating parts do not rotate, it means internal corrosion or deformation, do not buy.

Eight, look at the assembly parts have no missing parts. Regular assembly parts must be complete and intact to ensure smooth assembly and normal operation. If individual small parts on some assembly parts are missing, the assembly parts will not work or even be scrapped.