Maintenance and prevention measures for oil leakage during vehicle use[汽车维修知识]

1. The main reason for common vehicle oil leakage
1. Products (Accessories) Poor quality, material or workmanship; there are problems with structural design.
2. Improper assembly at high speed, unclean mating surface, damaged gasket, displacement or failure to install in accordance with operating regulations.
3. Uneven tightening of the tightening nut, breakage of the sliding wire or looseness and fall off, etc. cause work failure.
4. The sealing material wears excessively after long-term use, deteriorates due to aging, and becomes invalid due to deformation.
5.lubricating oilAdd too much oil, the oil level is too high, or the wrong oil is added.
6. The joint surface of parts (side covers, thin-walled parts) is flexed and deformed, and the shell is damaged, causing the lubricant to seep out.
7. After the vent plug and the one-way valve are blocked, due to the pressure difference between the inside and outside of the case, oil leakage will often occur at the weak seal.
2. Measures to prevent vehicle oil leakage
1. Pay attention to the role of cushioning.CarThe gasket between the parts of the stationary parts (such as the joint end faces, the end caps, the shell, the cover pad, the flat enamel cover, etc.) plays a role of leak-proof sealing. If the material, production quality and installation do not meet the technical specifications, the sealing and leak-proof function will not be achieved, and accidents may even occur.Such as an oil pan orValveThe cover is not easy to compact due to the large contact area, which causes oil leakage. When disassembling, pay attention to proper placement, check carefully, and assemble according to specifications.
2. All kinds of fastening nuts on the car need to be tightened according to the specified torque. If the packing is too loose or not tight, the gasket will leak; if it is too tight, the metal around the screw hole will bulge or the thread will slip and cause oil leakage. In addition, if the oil drain screw plug of the oil pan is not tightened or loosened, it is easy to cause oil loss, and then the machine damage accident of "burning tiles and holding shaft" will occur.
3. Timely replacement failureOil seal. Many moving parts (such as oil seals and O-rings) on the car will be mis-installed, causing the journal and the oil seal cutting edge to be out of concentricity, swinging and throwing oil. Some oil seals will lose elasticity due to the aging of the rubber when they are used for a long time. Any leakage should be updated in time.
4. The use of auto parts for too long will cause excessive wear and tear (such asPistonAnd cylinders, etc.), resulting in high-pressure gas in the combustion chamberCrankshaftTank and force the oil to leak out. Therefore, when the exhaust gas at the fuel filler cap is severely leaked out, the worn parts should be repaired or replaced as soon as possible.
5. Avoid blocking the check valve and vent valve. This causes the temperature in the tank to rise, and the oil and gas fill the entire space and cannot be discharged out of the canal, which increases the pressure in the tank and increases the consumption of lubricating oil and shortens the replacement cycle. After the engine ventilation system is blocked, the movement resistance of the piston is increased and fuel consumption is increased. Due to the difference in air pressure between the inside and outside of the case, it often causes oil leakage at the weak seal. Therefore, the vehicles need to be inspected, dredged, and cleaned regularly.
6. Properly solve the sealing of various oil pipe joints. Vehicle union nuts are often disassembled and assembled, which is easy to slip and break and loose; the accuracy of the two joints' bell mouths is poor, and the center lines of the two cones do not overlap and the contact is poor; the tapers are different and do not match, which will cause oil leakage . Replace the union nut, use the grinding method to solve the conical surface seal, and make the nut compact to solve the seal.
7. AvoidWheel hubSling oil. Excessive lubricating grease in the hub bearing and cavity, or improper oil packaging, poor quality and aging failure; excessive temperature of the hub caused by frequent braking; loose axle nuts, etc., will cause the hub to throw oil. Therefore, it is useful to use "cavity lubrication method (that is, appropriate amount of lubrication)" to dredge the vent holes, strictly select high-quality accessories, and perform assembly and high-speed according to process specifications.
Three, the maintenance and repair points of the vehicle
Assemble under extremely clean conditions, without bumps, scratches, burrs and other attachments on the working surface of the parts;
Strict operating procedures, seals should be installed correctly to prevent them from being deformed when they are not in place; master the performance specifications and use requirements of seals, and replace failed parts in time; for thin-walled side cover parts, use sheet metal for cold correction; shafts that are easy to wear Hole parts can use metal spraying, welding repair, gluing, machining and other processes to reach the original factory size; use as much as possibleSealantIf necessary, paint can be used as a substitute to achieve the desired sealing effect; the nut should be repaired or replaced with a new part if the screw is broken or loose, and screwed to the specified torque; the appearance quality of the rubber seal should be carefully checked before assembly; special tools should be used to press fit , To avoid knocking and deformation; add lubricating grease according to regulations, and regularly clean and dredge the vent and one-way valve. As long as the above points are achieved, the problem of vehicle oil leakage can be completely cured.

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