The fuel nozzle is a precision coupling. If diesel oil is dirty or used for a long time, it will return to oil due to wear: it is not economical to replace the nozzle. In order to avoid oil return leakage, oil can be led back to the oil tank or into the diesel filter through the oil return pipe. However, bubbles are easily generated in the oil circuit, which affects the oil supply. If the oil return pipe is damaged, a section of plastic pipe can be used to introduce the oil into the self-contained container, filter it and pour it back into the oil tank.

2. The oil transmission part leaks oil.

Tubing hollow screw gasket is uneven and leaks oil. Gaskets can be removed from the factory, ground and then filled. If it cannot be solved, a new gasket can be replaced, or a thicker soft plastic material can be cut into a gasket pad. The oil leakage at the joint between plastic oil pipeline and metal is mostly caused by the hardening or rupture of plastic pipe. You can cut off the hardened and cracked part, then soften it with slow fire, put it on the metal joint while it is hot, and then tie it with fine iron wire. Metal tubing is cracked and leaks oil, so it can be brazed. In order to prevent the tubing from breaking, the elbow should be suitable, and it should not be installed by hard pulling, and the pipe body should not contact with the fuselage to avoid wear.

3. The valve cover leaks oil

When installing the valve cover, the tightening force is too large, which is easy to deform and leak oil. Unload the spilled oil, hammer it with a wooden stick to shape it, restore the smoothness of the contact surface, and then pad it with a gasket.

In the use of vehicles, oil leakage often occurs, which will directly affect the technical performance of vehicles, lead to the waste of lubricating oil and fuel, consume power, affect the cleanliness of vehicles and cause environmental pollution. Due to oil leakage, the lubricating oil in the machine is reduced, and the parts are poorly lubricated and insufficiently cooled, which will cause early damage to the parts and even leave hidden dangers of accidents.

First, the main causes of common automobile oil leakage

1. The product (accessories) is of poor quality, material or workmanship; There is something wrong with the structural design.

2. The assembly speed is improper, the mating surface is not clean, and the gasket is damaged, displaced or not installed according to the operating procedures.

3. Uneven tightening force of the fastening nut, broken thread or loose fall-off will lead to work failure.

4. The sealing material is worn, aged, deteriorated and deformed after long-term use.

5. Too much lubricating oil, too high oil level or wrong oil.

6. The joint surface of parts (side cover, thin-walled parts) is bent and deformed, the shell is damaged, and lubricating oil seeps out.

7. After the exhaust plug and one-way valve are blocked, oil leakage often occurs at the weak seal due to the air pressure difference inside and outside the box shell.

Second, measures to prevent vehicle oil leakage

1. Pay attention to the role of pads. Gaskets between parts of automobile fixing parts (such as joint end face, end cover, shell, cover pad, flat enamel cover plate, etc.). ) plays the role of leakage prevention and sealing. If the materials, production quality and installation do not meet the technical specifications, it will not play a role in sealing and leakage prevention, and even accidents will occur. Such as oil pan or valve cover, because of the large contact area, it is difficult to compress, resulting in oil leakage.

2. All kinds of fastening nuts on the vehicle should be tightened according to the specified torque. If the gasket is too loose, it will leak water; Too tight will make the metal protrusion or thread around the screw hole slip, resulting in 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, and then the engine damage accident of "burning tile and holding shaft" occurs.

3. Replace the failed oil seal in time. Many moving parts (such as oil seal and O-ring) on the vehicle will throw oil because of improper installation, misalignment and deviation of the journal and the oil seal cutting edge. Some oil seals will lose their elasticity due to rubber aging if they are used for too long. If leakage is found, it should be updated in time.

4. Avoid blocking the check valve and exhaust valve. As a result, the temperature in the tank shell rises, and the oil and gas fill the whole space and cannot be discharged, so that the pressure in the tank shell rises, the consumption of lubricating oil increases, and the replacement cycle is shortened. After the engine ventilation system is blocked, the movement resistance of the piston increases and the fuel consumption increases. Due to the pressure difference between the inside and outside of the box shell, oil leakage often occurs at the weak seal. Therefore, it is necessary to inspect, dredge and clean the vehicle regularly.

5. Properly solve the sealing of various tubing joints. Vehicle union nut is often disassembled, which is easy to slip and break, which will cause oil leakage. Replace the union nut, solve its conical surface seal by grinding, and press the nut to solve the seal.

6. Avoid oil spilling from the hub. Too much grease in the hub bearing and cavity, or improper assembly of its oil seal, poor quality and aging failure; Frequent braking leads to excessive hub temperature; Loose shaft nuts, etc.