Quality and Safe Use Procedure of Antirust Oil

Each industry, the characteristics of its damage is also different.

(1) Mechanical damage Mechanical damage of sliding bearings refers to the occurrence of different degrees of groove marks on the alloy surface of the bearing bush. In severe cases, metal peeling and large-area messy scratches occur on the contact surface; under normal circumstances, contact surface damage and ablation The phenomenon exists at the same time.

The main reason for the mechanical damage of the bearing is that the oil film is difficult to form on the bearing surface or the oil film is seriously damaged.

(2), bearing cavitation sliding bearing in the cylinder pressure impact load) under the repeated action, the surface layer of plastic deformation and cold work hardening, local loss of deformation capacity, gradually form a grain and continue to expand, and then with the fall of wear debris, in the loaded surface layer to form a hole.

Generally, when the bearing bush cavitation occurs, the pit first appears, and then the pit gradually expands and causes the crack of the alloy layer interface, and the crack extends along the parallel direction of the interface until it peels off.

The main reason of sliding bearing cavitation is that the sudden change of the cross section of the oil groove and oil hole causes the oil flow to be strongly disordered, and bubbles are formed in the vacuum area of the oil flow disorder, and then due to the pressure rise, the bubbles collapse and produce cavitation.

Cavitation generally occurs in the high load area of the bearing, such as the lower bearing of the crankshaft main bearing.

(3) Fatigue pitting bearing fatigue pitting refers to the overheating of the bearing and the excessive clearance of the bearing due to the overload of the engine, resulting in fatigue damage, fatigue pitting or fatigue shedding in the middle of the bearing.

Most of this damage is caused by overload, excessive bearing clearance, or unclean lubricating oil, mixed with foreign matter.

Therefore, when using, you should pay attention to avoid bearing overload and do not run at too low or too high speed; adjust the engine to a stable state when idling; ensure normal bearing clearance to prevent the engine speed from being too high or too low; check and adjust the cooling The working condition of the system ensures that the working temperature of the engine is appropriate.

(4) Corrosion of bearing alloy Corrosion of bearing alloy is generally due to impure lubricating oil. Chemical impurities (acid oxides, etc.) in the middle of lubricating oil oxidize the bearing alloy to generate acidic substances, causing the bearing alloy to partially fall off and forming irregular tiny cracks or pits.

The main reason for the corrosion of bearing alloy is improper selection of lubricating oil, poor corrosion resistance of bearing materials, or rough engine work and high temperature.

(5) There is direct contact between the bearing burning journal and the bearing friction pair with tiny raised metal surfaces, forming local high temperature. In the case of insufficient lubrication and poor cooling, the bearing alloy will turn black or locally burn.

This fault is often caused by the tight fit between the journal and the bearing; insufficient lubricating oil pressure is also easy to burn the bearing.

(6), bearing outer circle bearing outer circle is the relative rotation of the bearing in the seat hole.

After the bearing goes out of the circle, it not only affects the heat dissipation of the bearing, but also causes the alloy on the inner surface of the bearing to be ablated, and the back of the bearing will be damaged, and the bearing will be burned in severe cases.

The main reason is that the bearing is too short, the tenon is damaged, and the processing or installation does not meet the specifications.