Inspection of loose leaves of radical bearings and rod

As already mentioned, even if you plan to use the new liners, it is highly recommended immediately after removal Do not throw away the old - their thorough examination can provide valuable information about the condition of the engine and causes of faults. Signs of major defects can be seen in Fig. 2.28.

Defects caused by foreign particles into the engine look like longitudinal risks in main and connecting rod bushings. Abrasive particles sometimes remain in the details of the engine after reconditioning, particularly if the items have not been thoroughly cleaned using appropriate methods. Often these metallic particles appeared after machining, and as a result of engine wear as operation. They can get into the oil, and from there, passing through the filters, - the bearings. The best way to prevent such defects - maintaining perfect purity of all parts of the engine both during assembly and during operation of the engine.

Produce, as specified in the instruction manual, regular replacement of the engine oil and filter.

Defects due to lack of lubrication look as if the liner material is rubbed, crumble or embossed with a steel base. This is due to overheat (which causes dilution of the oil, liners often obtained bluish), an excessive load (which leads to the expulsion of oil from the bearing cover, as a result, spalling and cracking). Lack of lubrication can also be caused by excessive play in the oil pump or continuous operation of the engine at high speeds, channel blockage of the oil system (use of inappropriate oils, delayed its replacement).

Electrochemical corrosion of bearings can be caused by constant travel for short distances. In this case, the heat generated during the short trip motor is not sufficient to remove water vapor and corrosive gases. These substances are accumulated in the engine oil, forming a sludge and acid. As the oil flows to the bearings of the engine, the acid acts on the liner material and cause corrosion.

Improper installation of the liner during assembly also leads to its failure. Too tightly installed liners leave insufficient working air gap, which leads to insufficient lubrication. Dirt or debris trapped at the back of the insert, lead to its buckling and failure. Therefore, do not touch the inner working surface of loose leaves with your fingers during assembly - you can scratch the surface, which requires careful handling, or leave her dirt.

As already mentioned, it is recommended for any engine disassembly to replace the pads - to do otherwise, you get only apparent savings.