In the use of cars, oil leakage faults often occur, which directly affect the technical performance of the car, leading to waste of lubricating oil and fuel, consumption of power, affecting the cleanliness of the car, and causing environmental pollution. Due to oil leakage and a decrease in lubricating oil inside the machine, poor lubrication and insufficient cooling of the components can cause early damage and even pose a hidden danger of accidents.

1、 The main causes of common vehicle oil leaks

1. Poor quality, material or craftsmanship of products (accessories); There are issues with the structural design.

2. Improper assembly at high speeds, unclean mating surfaces, damaged or displaced pads, or failure to install according to operating procedures and specifications.

3. Uneven tightening force of fastening nuts, loose threads or loose threads can cause work failure.

4. After long-term use, the sealing material has worn out beyond the limit, aged, deteriorated, deformed and failed.

5. Excessive addition of lubricating oil, high oil level, or incorrect oil type.

6. The joint surface of components (edge covers, thin-walled parts) bends and deforms, and the shell is damaged, causing lubricating oil to seep out.

7. After the ventilation plug and one-way valve are blocked, the pressure difference between the inside and outside of the box often causes oil leakage at the weak seal.

2、 Measures to prevent vehicle oil leakage

1. Pay attention to the role of padding. The gasket between the components of the stationary parts of the car (such as the joint end faces, end caps, shells, cover pads, flat enamel cover plates, etc.) plays a leak proof sealing role. If the materials, production quality, and installation do not meet the technical specifications, it will not be able to achieve sealing and leak prevention, and even accidents may occur. Such as oil pan or valve cover, due to the large contact area, it is not easy to compact, resulting in oil leakage. When disassembling, pay attention to proper placement, carefully inspect, and assemble according to specifications.

2. All types of fastening nuts on the car need to be tightened to the specified torque. If the gasket is not tightly compressed, it will leak; Being too tight can cause metal protrusions around the screw hole or cause the thread to slip, leading to oil leakage. In addition, if the oil drain plug of the oil pan is not tightened or loosened, it is easy to cause oil loss, which can lead to machine damage accidents such as "burning tiles and holding shafts".

3. Replace the failed oil seal in a timely manner. Many moving parts on the car, such as oil seals and O-rings, may experience oil spillage due to improper installation, resulting in misalignment between the shaft neck and the oil seal blade. Some oil seals may lose their elasticity due to rubber aging after prolonged use. Discovering leaks should be updated promptly.

4. Long term use of automotive parts can result in excessive wear (such as pistons and cylinders), causing high-pressure gases from the combustion chamber to enter the crankcase and forcing oil leakage. Therefore, when there is severe exhaust gas leakage at the oil inlet cover, early maintenance or replacement of worn parts should be carried out.

5. Avoid blocking the one-way valve and ventilation valve. This causes an increase in temperature inside the casing, filling the entire space with oil and gas and preventing them from being discharged out of the canal, resulting in an increase in pressure inside the casing, increased consumption of lubricating oil, and shortened replacement cycles. After the engine ventilation system is blocked, it increases the resistance to piston movement, leading to an increase in fuel consumption. Due to the pressure difference between the inside and outside of the box shell, oil leakage often occurs at weak sealing points. Therefore, regular inspections, dredging, and cleaning of vehicles are necessary.

6. Properly solve the sealing of various oil pipe joints. The coupling nut for vehicles is often disassembled and disassembled, which can easily cause the thread to slip, break, and loosen; The accuracy of the horn mouth of the two joints is poor, and the center lines of the two conical surfaces do not coincide, resulting in poor contact; Different taper angles that do not match can cause oil leakage. Replace the union nut and use grinding method to solve its conical surface seal, so that the nut can be tightened to solve the seal.

7. Avoid wheel hub oil spillage. Excessive lubricating grease in the wheel hub bearings and cavities, or improper oil packaging, poor quality, and aging failure; Excessive hub temperature caused by frequent braking; Loose axle nuts and other factors can cause the wheel hub to shake oil. Therefore, the "cavity lubrication method" is used to clear the ventilation holes, strictly select high-quality accessories, and assemble and speed according to the process specifications

3、 Key points for vehicle maintenance and repair

Assemble under extremely clean conditions, with no bumps, scratches, burrs, or other attachments on the working surface of the parts; Strict operating procedures, seals should be installed correctly to prevent deformation if not in place; Master the performance specifications and usage requirements of seals, and replace faulty parts in a timely manner; For thin-walled parts with edge covers, sheet metal cold work correction is used; Shaft hole parts that are prone to wear can be processed using techniques such as metal spraying, welding repair, adhesive bonding, and mechanical processing to achieve the original factory size; Try to use sealant as much as possible, and if necessary, use paint as a substitute to achieve the desired sealing effect; The nut thread should be repaired or replaced with new parts if it breaks or becomes loose, and tightened to the specified torque; Before assembling rubber seals, the appearance quality should be carefully inspected; Use specialized tools for compression fitting to avoid deformation caused by knocking; Add lubricating grease according to regulations, regularly clean and unclog ventilation holes and check valves, etc. As long as the above points are achieved, the problem of vehicle oil leakage can be completely cured.