Auto Parts Purchase Skills

First, see whether the trademark logo is complete. The packaging quality of authentic products is good, the writing on the packaging box is clear, and the overprinting color is bright. The packaging box and bag should be marked with the product name, specification, model, quantity, registered trademark, factory name, factory address and phone number, etc. Some manufacturers also play their own marks on the accessories. Some important components such as generators, distributors, fuel injection pumps, etc., are also equipped with instructions, certificates and inspectors to guide users to use and maintain correctly. When purchasing should be carefully recognized, to prevent the purchase of fake and shoddy products.
Second, see whether the geometric size is deformed. Some parts are easily deformed due to improper manufacturing, transportation and storage. During inspection, the shaft parts can be rolled around the glass plate to see if there is light leakage at the fitting of the parts and the glass plate to determine whether it is bent; When purchasing the clutch driven plate steel plate or friction plate, the steel plate and friction plate can be held in front of the eyes to observe whether it is warped; In the purchase of oil seals, the end face of the oil seal with a skeleton should be round, and can be fitted with flat glass without deflection; The outer edge of the oil seal without skeleton should be correct, and it should be deformed by hand, and it should be able to return to its original state after letting go. In the purchase of various types of padding, you should also pay attention to check the geometric size and shape.
Third, see whether the combination part is smooth. In the process of handling and storage of spare parts, due to vibration and bump, burrs, indentation, damage or cracks are often produced in the combined parts, affecting the use of parts. Pay attention to check when purchasing.
Fourth, see whether the surface of the parts corrosion. Qualified parts surface, both a certain degree of precision and a polished finish, the more important parts, the higher the precision, the more stringent the packaging anti-rust anticorrosion. When purchasing should pay attention to check, if the parts are found to have rust spots, mildew spots or rubber parts cracked, lost elasticity, or the journal surface has obvious turning lines, should be replaced.
Five, see whether the protective surface is intact. Most parts are coated with a protective coating when they leave the factory. Such as piston pin, bearing shell with paraffin protection; The piston ring and cylinder liner are coated with anti-rust oil and wrapped with wrapping paper; Valves, pistons, etc., are wrapped in plastic bags after soaking in anti-rust oil. When purchasing, if the sealing sleeve is damaged, the wrapping paper is lost, and the loss of anti-rust oil or paraffin should be returned and replaced.
Six, see whether the bonded parts are loose. Accessories composed of two or more parts, between the parts are by pressing, bonding or welding, they are not allowed to loose phenomenon, such as the oil pump plunger and adjusting arm is combined by pressing; The clutch driving wheel is riveted with the steel sheet, and the friction sheet is riveted or bonded with the steel sheet; Paper filter core skeleton and filter paper are bonded; The wire ends of electrical equipment are welded. If it is found to be loose when purchasing, it should be replaced.
Seven, see whether the rotating parts are flexible. When purchasing the rotating parts assembly such as oil pump, rotate the pump shaft by hand, should feel flexible without stuck; When purchasing rolling bearings, one hand supports the inner ring of the bearing, the other hand spins 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, it indicates that the internal rust or deformation, do not buy.
Eight, look at the assembly parts have missing parts. The regular assembly parts must be complete and intact to ensure smooth assembly and normal operation. If the individual small parts on some assembly parts are missing, the assembly parts will not work or even be scrapped.