1. Check whether the trademarks and logos are complete. The outer packaging of genuine products is of very good quality, the writing on the packaging box is very clear, and the overprinting is bright.

The packaging box and bag should be marked with the product name, specification model, quantity, registered trademark, factory name and address, telephone number, etc. Some manufacturers also put their own marks on the accessories. Some important parts such as generators, distributors, injection pumps, etc. are also equipped with corresponding instruction manuals, certificates of conformity and inspector seals to guide users to use and maintain them correctly. You should carefully identify them when purchasing to prevent buying counterfeit and shoddy products.

2. Check whether the geometric dimensions are deformed.

Some parts are prone to deformation due to improper manufacturing, transportation and storage. When checking, you can roll the shaft parts along the glass plate to see if there is any light leakage at the joint between the parts and the glass plate to determine whether they are bent; when purchasing the clutch driven plate steel plate or friction plate, you can hold the steel plate and friction plate in front of your eyes to observe whether they are warped; when purchasing oil seals, the end face of the oil seal with a skeleton should be a perfect circle, which can be attached to the flat glass without bending; the outer edge of the oil seal without a skeleton should be straight, and it should be deformed by holding it with your hand, 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 dimensions and shapes.

3. Check whether the joint is flat.

During the transportation and storage of spare parts, due to vibration and bumps, burrs, indentations, breakage or cracks often occur at the joint, affecting the use of parts. Pay attention to insp

Each car is assembled from tens of thousands of parts. When you use your car, as the condition of the car changes, you will have different needs for accessories at any time. There are many types of auto parts. Nowadays, there are more and more car brands and more and more types of cars.

The various accessories are usually divided into the following categories according to their use:
According to the purpose of the accessories:
Auto Parts 1: Consumable Parts
During the operation of the car, some parts that are naturally aged, failed and expired must be replaced, such as various transmission belts, hoses, gaskets, electrical parts (spark plugs, high-voltage wires, distributors, platinum, distributor caps, relays, etc.) various filter elements, tires, batteries, etc.

Auto Parts 2: Consumable Parts
During the operation of the car, some parts that fail due to natural wear, such as bearings, pistons, piston rings, cylinder liners, valves, valve guides, kingpins, kingpin bushings, camshafts, wheels, brake pads, brake drums, clutch friction plates, various oil seals, pins, sleeves, etc.

Auto Parts 3: Repair Parts
Parts that must be replaced within a certain operating cycle of the car, such as various shafts, gears, fasteners of various moving parts, and parts that must be replaced during the service life (such as some safety fasteners, steering knuckles, half-axle sleeves, etc.).

Auto Parts 4: Basic Parts
Basic parts are usually some of the main assembly parts that make up the car and are of high value. In principle, they should be full-life parts, but they may be damaged due to improper use and should usually be repaired or replaced with new parts, such as flywheels, cylinder blocks, cylinder heads, camshafts, frames, rear axle housings, gearbox housings, etc.

Auto Parts 5: Accidents
Parts that are usually damaged in car accidents, such as front axles, body panels, cabs, drive shafts, water tanks, etc.

According to the different positions of accessories:
1. Engine ac

First, try to use sealant, and paint can be used as a substitute if necessary to achieve an ideal sealing effect;
Second, carefully check the appearance quality of rubber seals before assembly; use special tools to press fit to avoid knocking and deformation;
Third, add lubricating grease as required, and regularly clean and clear the vents and one-way valves;
Fourth, assemble under extremely clean conditions, and the working surface of the parts should be free of bumps, scratches, burrs and other attachments;
Fifth, strictly follow the operating procedures, and seals should be installed correctly to prevent deformation due to incompleteness;
Sixth, master the performance specifications and use requirements of seals, and replace failed parts in time;
Seventh, for thin-walled parts such as side covers, use sheet metal cold work for correction; easily worn shaft hole parts can use metal spraying, welding, gluing, machining and other processes to achieve the original factory size;
Eighth, nuts that are threaded, broken, or loose should be repaired or replaced with new parts, and tightened to the specified torque.