Reasons for oil leakage of ordinary semi-trailers and treatment methods

If ordinary semi-trailers do not pay attention to maintenance, there will be a lot of headaches, such as oil leakage from the trailer. Due to oil leakage and the reduction of lubricating oil inside the machine, the parts are poorly lubricated and insufficiently cooled, which will cause early damage to the parts and even leave hidden accidents.

Measures to prevent vehicle oil leakage

1. Pay attention to the role of cushioning. The gaskets between the parts of the stationary parts of the car (such as each joint end face, each end cover, shell, cover cushion, flat enamel cover, etc.) play a leak-proof and sealing role. If the material, production quality and installation do not meet the technical specifications, the sealing and leakage prevention function will not be achieved, and accidents may even occur. For example, the oil pan or valve cover is not easy to compact due to the large contact area, which causes oil leakage.

2. All kinds of fastening nuts on the car need to be tightened according to the specified torque. If the liner 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 sump oil drain plug is not tightened or loosened and falls off, it is easy to cause oil loss, and then the machine damage accident of "burning bushes and holding shafts" will occur.

3. Replace the failed oil seal in time. Many moving parts (such as oil seals, O-rings) on the car will be incorrectly installed, causing the journal and the oil seal cutting edge to be out of concentricity, swinging and throwing oil. Some oil seals will lose their elasticity due to aging of the rubber when they are used for a long time. Any leakage should be updated in time.

4. Avoid blockage of check valves and vent valves. This causes the temperature in the tank to rise, and the oil and gas fill the entire space and cannot be discharged, 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 the 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 vehicle needs to be inspected, dredged, and cleaned regularly.

5. Properly solve the sealing of various oil pipe joints. Vehicle union nuts are often disassembled and assembled, and they are easy to slip and break and loosen, which may cause oil leakage. Replace the union nut, use the grinding method to solve the conical surface seal, and press the nut to solve the seal.

6. Avoid oil slinging from the wheel hub. 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 necessary to use the "cavity lubrication method (that is, appropriate amount of lubrication)" to clear the vent holes.

The main cause of common vehicle oil leakage

1. Product (accessory) quality, material or craftsmanship is poor; there are problems with structural design.

2. Improper high-speed assembly, unclean mating surface, damaged gasket, displacement or failure to install in accordance with operating regulations.

3. Uneven tightening force of the tightening nut, breakage of the sliding wire or looseness and fall off, etc. cause work failure.

4. After long-term use, the sealing material wears excessively, deteriorates due to aging, and becomes invalid due to deformation.

5. Too much lubricating oil is added, 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 casing 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, the oil leaks at the weak seal.