Tips for buying auto parts

First, see whether the trademark logo is complete. Authentic product packaging of good quality, clear handwriting on the box, overprint colorful. Boxes, bags, should be marked with the product name, specifications, quantity, registered trademarks, factory name and address and telephone number, etc., some manufacturers also play their own mark on the accessories. Some important parts such as generators, distributors, injection pumps, etc., also comes with instruction manuals, certificates of conformity and inspector's chapter to guide the user to correctly use the maintenance. Selection should be carefully recognized, in order 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, improper storage, easy to produce deformation. When checking, the shaft parts can be rolled along the glass plate a circle, look at the parts and glass plate affixed with no light leakage to determine whether the bend; purchase clutch disc or friction plate, steel plate, friction plate can be lifted in front of the eyes to observe whether it is warped; in the purchase of oil seals, oil seals with a skeleton end should be a square, can be affixed to the plate glass without deflection; skeleton oil seals should be the outside edge of the right, with a hand grip to make it deformed, and should be able to return to its original state after letting go of the hands. After letting go, it should be able to restore the original shape. In the purchase of various types of gaskets, should also pay attention to check the geometry and shape.

Third, see whether the combined part is flat. Parts in the handling, storage process, due to vibration, bumping, often in the combination of parts produced burrs, indentation, damage or cracks, affecting the use of parts. Selection should pay attention to check.

Fourth, look at the surface of the parts with or without corrosion. Qualified spare parts surface, both a certain degree of precision and clanking bright finish, the more important spare parts, the higher the precision, the more stringent packaging rust and corrosion. Selection should pay attention to the inspection, if the parts are found to have rust spots, mold spots or rubber parts cracking, loss of elasticity, or the surface of the journal has a clear cutter lines, should be replaced.

Fifth, see whether the protective surface layer is intact. Most of the parts in the factory are coated with protective layer. Such as piston pins, tiles with paraffin wax protection; piston rings, cylinder liner surface coated with antirust oil and wrapped in wrapping paper; valves, pistons, etc. dipped in antirust oil and encapsulated in plastic bags. Selection of the sealing set found broken, wrapping paper loss, anti-rust oil or paraffin loss, should be returned.

Sixth, see whether the glue parts are loose. By two or more parts combined into accessories, parts are pressed, glued or welded, they are not allowed to have a loose phenomenon, such as the oil pump plunger and regulator arm is assembled through the pressure; clutch driven wheel and steel is riveted combination of friction and steel is riveted or glued; paper filter cartridge skeleton and filter paper is glued into the; electrical equipment is welded into the wire. Selection if found loose, should be replaced.

Seven, see whether the rotating parts are flexible. Selection of oil pumps and other rotating parts assembly, turn the pump shaft by hand, should feel flexible without stagnation; selection of rolling bearings, one hand to support the bearing inner ring, the other hand spinning the outer ring, the outer ring should be able to rotate quickly and freely, and then gradually stop. If the rotating parts do not rotate well, indicating internal corrosion or deformation, do not buy.

Eight, look at the assembly components have no missing parts. Regular assembly parts must be complete and intact to ensure smooth assembly and normal operation. Some of the assembly parts on the individual small parts if missed, will make the assembly parts can not work or even scrapped.