As bearings spindle w and connecting rod, using the most common fault is the wear-resistant alloying layer stripped or burned, and early wear of the bearing. After a short run of diesel engines, bearing surface that quickly damage or excessive wear, the reason most are not Bush per se, but mainly due to the use or technical condition resulting from adverse conditions or with parts. There′s a poll suggests that causes bearing damage 44.9% is due to impurities, 13.4% is poor Assembly, 12.7% are concentric degree because of poor 10.8% is poor lubrication, 9.5% is overloaded and the rest are other factors such as corrosion.
Diesel engines in the process of starting, stopping, and are often critical of FAG bearings lubrication allows continuous oil film, friction, direct contact. Even if the engine during normal operation, because load factors such as instability, shafts and bearing it is difficult to keep even and continuous liquid lubrication. In addition, the new diesel engine at the time of Assembly of not completely clearing the sand and iron filings, can be entered in the operation of dust, dirt, is accelerated wear, mainly responsible for burning Lava tile.
FAG bearings falling off was mainly due to fatigue damage. Because the size of the load bearing and direction changes with the time, when the load is oscillating, bearing friction surfaces cannot keep even continuously between the film, and the oil film pressure in pulse and change. When the minimum oil film thickness, load bearing surfaces within the local area have a high temperature, greatly reducing the fatigue strength of alloy layer. In addition, the FAG bearing manufacturing Assembly in itself bad, is the direct cause of lead alloy layer peeling off.
Except for wear and spalling, plain FAG bearings corrosion is also noticeable problems, largely depends on the quality of oil, temperature, pressure, and bearing loads. Bearing high load areas most prone to corrosion, and lubricating oil in organic acids and sulfide generated under high-temperature metamorphic is a direct cause of bearing corrosion.
Burning of FAG bearings, that is usually referred to "burnt", mainly due to the clearance is too small, poor lubrication and operation issues.