1. Pay attention to packaging

The outer packaging of good accessories is generally more standardized, uniform standard specifications, and should be marked with product name, specification model, quantity, registered trademark, factory name, factory address and telephone number, etc.

2. Pay attention to appearance

The surface of qualified parts has clear and regular printing or casting and marking, which has a certain degree of precision and a bright finish. If the parts are found to have rust spots, cracked rubber parts, loss of elasticity, or obvious cutting tool lines on the surface of the journal, they should be returned for replacement 

Three, pay attention to paint

The unscrupulous merchants simply processed the waste parts, such as dismantling, assembling, assembling, putting together, painting, etc., and then selling them as "qualified products". After removing the surface paint, the old paint can be found.

Four, pay attention to the craft

Although the appearance of inferior products is sometimes good, due to poor production technology, cracks, sand holes, slag inclusions, burrs or bruises are prone to appear. If the cylinder gasket is squeezed and deformed, it is easy to cause the sealing and ablation during use, resulting in oil leakage, air leakage and water leakage.

Five, pay attention to "loose"

The fittings composed of two or more parts are formed by pressing, bonding or welding between the parts, and no looseness is allowed.

Six, pay attention to the assembly mark

In order to ensure that the assembly relationship of the parts meets the technical requirements, some regular parts are engraved with assembly marks on the surface, such as timing gear marks, piston top marks and other assembly marks. If there is no mark or the mark is blurred, it will not be recognized, which will bring great difficulties to assembly. .

Seven, pay attention to omissions

The regular assembly parts must be complete and intact to ensure smooth loading and normal operation. Some small parts on the assembly are missing and may be "parallel imports."

8. Pay attention to the protective layer

In order to facilitate storage and prevent the parts from bumping, the parts have a protective layer before they leave the factory. For example, the piston pin and bearing bush should be protected with paraffin wax; the surface of the piston ring and cylinder liner should be coated with anti-rust oil and wrapped with wrapping paper. If the sealing sleeve is damaged or the anti-rust oil or paraffin is lost during the purchase, it should be returned.

Nine, pay attention to documents

Some important parts, especially assemblies, such as carburetors, distributors, generators, etc., are usually shipped with manuals to guide users in installation, use and maintenance.

10. Pay attention to specifications

Most auto parts have specified models and technical parameters. When purchasing electrical equipment, please pay attention to check whether the voltage and power of the replaced parts are consistent