First, pay attention to packaging Good accessories oute […]
First, pay attention to packaging Good accessories outer packaging is generally more standardized, unified standard specifications, should be marked with product name, specification model, quantity, registered trademark, factory name, factory address and telephone number.
Second, pay attention to the appearance of qualified parts surface, printing or casting and marking clear and regular, both a certain degree of precision and a bright finish. If the parts are found to have rust spots or rubber cracks, loss of elasticity, or obvious turning pattern on the surface of the journal, it should be returned.
Third, pay attention to paint Unscrupulous traders will use the simple processing of scrap parts, such as dismantling, loading, spelling, scraping, painting, etc., and then pretend to be qualified products for sale, after the surface paint is removed, the old paint can be found.
Fourth, pay attention to the process The appearance of inferior products is sometimes good, but due to poor manufacturing process, cracks, sand holes, slag inclusions, burrs or bumps are prone to occur. If the cylinder head is squeezed and deformed, it may cause the seal to be ablated and ablated during use, resulting in oil leakage, air leakage and water leakage.
5. Pay attention to looseness. Parts made up of two or more parts are assembled by pressing, gluing or welding. No looseness is allowed.
Sixth, pay attention to the assembly mark to ensure that the assembly relationship of the accessories meets the technical requirements. Some regular parts are engraved with assembly marks, such as timing gear marks, piston top marks and other assembly marks. If there is no mark or the mark is blurred, it will be unrecognizable and will be assembled. It brings great difficulties.
Seven, pay attention to the lack of formal assembly components must be complete, in order to ensure smooth loading and normal operation. Some small parts on the assembly are missing, which may be parallel.
8. Pay attention to the protective layer In order to facilitate the storage and prevent the parts from colliding, the parts have a protective layer before leaving the factory. For example, the piston pin and the bearing bush are protected by paraffin; the surface of the piston ring and the cylinder sleeve is coated with anti-rust oil and wrapped with wrapping paper. If the seal sleeve is damaged, rust-proof oil or paraffin is lost during purchase, it should be returned.
Nine, pay attention to the certificate Some important components, especially the assembly, such as carburetor, distributor, generator, etc., usually with instructions to guide the user to install, use and maintain.
X. Pay attention to specifications Most auto parts have specified models and technical parameters. If you purchase electrical equipment, you should check whether the voltage and power of the replaced parts are consistent.