In the maintenance and repair of automobiles, we often worry about buying fake and shoddy fittings and fittings without care. Then, how can we buy qualified fittings?

1., see whether the trademark logo is complete. The quality of the outer packing of the authentic product is good, the writing on the box is clear and the color is bright. Packaging boxes, bags, should be marked with product name, specifications, models, quantities, registered trademarks, factory name, site and telephone number, etc., some manufacturers also accessories on their own mark. Some important components, such as generator, distributor, fuel injection pump and so on, also have the instruction manual, the certificate of qualification and the inspector's chapter, so as to guide the users to use and maintain correctly. Purchase should be carefully recognized, in case the purchase of fake and shoddy products.

2. see if the geometry is deformed or not. Some parts are prone to deformation due to improper manufacture, transportation and storage. Check, the shaft along the glass plate rolling circle, see parts and glass plate joints have no leakage to determine whether the purchase of steel plate bending; or when the friction clutch disc, the steel sheet and a friction sheet before me to observe whether the warpage; in the purchase of oil seal, oil seal face with skeleton the positive circle, no deflection and flat glass fitting; no skeleton oil seal outer upright, with hands and deformed, let go after should be able to recover. In the purchase of various types of gaskets should also pay attention to check the geometry size and shape.

3., see whether the joint site is smooth. Spare parts in the handling, storage process, due to vibration, bump, often produce burr, indentation, damage or crack in the binding site, influence the use of parts. Should pay attention to inspection when shopping.

4. see if the parts are rusted or not. The surface of the qualified parts, with certain precision and polished finish, the more important parts, higher accuracy, more strict anticorrosive packaging. When purchasing, should pay attention to inspection, if found that parts have corrosion spots, mildew spots or rubber parts cracking, lose elasticity, or the shaft neck surface has obvious tool line, should be replaced.

5. see if the protective surface is intact. Most parts are coated with protective coatings when they leave the factory. Such as piston pin, bearing shell with paraffin protection; piston ring, cylinder surface coated with antirust oil and wrapped with wrapping paper; valves, pistons and other anti rust oil after the plastic bag packaging. When buying, if found the sealing sleeve breakage, the packing paper to be lost, the antirust oil or the paraffin wax loss, should exchange.

6. see if the adhesive parts are loose or not. By two or more than two parts combined into parts, parts by pressing, welding or bonding, does not allow loosening between them, such as the pump plunger and the adjusting arm is pressed by combination; clutch driven wheel and steel sheet is riveted with the friction plate and the steel plate is riveting or adhesive; the paper filter frame and filter paper is glued together; electrical equipment is formed by welding wire. When shopping, if found loose, should be replaced.

7. see if the rotating parts are flexible. Choose the pump rotating parts assembly, turn the pump shaft by hand, should be flexible and no delay; purchase of rolling bearings, a bearing inner ring, the other hand around the outer ring, the outer ring should be able to quickly rotate freely, and then gradually stopped. If the rotation of the rotating parts is not working, the internal corrosion or deformation, do not buy.

8. see whether the assembly parts are missing or not. Regular assembly parts must be complete and complete, in order to guarantee the smooth assembly and normal operation. If the small parts of some assembly parts are missing, the assembly parts can not work or even be scrapped.