1. Check whether the turbocharger trademark logo is complete. The outer packaging of authentic products is of good quality, with clear writing on the box and bright overprinting colors. The packaging boxes should be marked with the product name, specifications, model, quantity, registered trademark, etc. Some manufacturers also put their marks on the accessories. You should be careful when purchasing to avoid buying fake and shoddy products.
2. Check whether the geometric dimensions of the turbocharger are deformed. Some parts are prone to deformation due to improper manufacturing, transportation, and storage. During the inspection, you can roll the shaft part along the glass plate to see if there is light leakage at the joint between the part and the glass plate to determine whether it is bent; when purchasing an oil seal, the end face of the oil seal with a skeleton should be in a perfect circle and can fit in with the flat plate. Glass fit; the outer edge of the frameless oil seal should be straight, and it should be deformed by holding it, and it should be able to return to its original shape after letting go. When purchasing various types of gaskets, you should also pay attention to checking the geometric size and shape.
3. Check whether the joint part of the turbocharger is flat. During the transportation and storage of spare parts, due to vibration and bumps, burrs, indentations, damage or cracks often occur at the joint parts, which affects the use of the parts.
4. Check whether there is any rust on the surface of the turbocharger parts. The surface of qualified spare parts has both a certain degree of precision and a shiny finish. The more important the spare parts, the higher the precision, and the stricter the rust and corrosion prevention of the packaging.
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article source: https://www.syuancn.com/news/how-to-judge-whether-a-turbocharger-is-good-or-bad/