Reasons for wear of the thrust surface of the piston engine’s thrust main bearing
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Guys, I can’t send the photos. What are the reasons for wear on the thrust surface on the flywheel side of the piston engine’s thrust main shaft bearing and on the shaft diameter?
The reasons for wear on the thrust surface on the flywheel side of the piston engine’s thrust main bearing and on the shaft diameter may include: 1. Insufficient or poor-quality lubricating oil: Inadequate supply of lubricating oil or low quality of such oil leads to poor lubrication, which in turn increases friction between the bearing and the shaft, resulting in wear. 2. Excessive or insufficient bearing clearance: Improper design or installation of the bearings, along with clearance that does not meet the specified standards, results in uneven loads being applied to the bearing shells during operation, leading to wear. 3. Carbon buildup or impurities: Carbon buildup in the combustion chamber or impurities in the lubricating oil can enter the bearings, causing wear. 4. Operating beyond the design load: If the engine operates for extended periods under a load that exceeds its design capacity, it will exert excessive pressure on the bearing shells, leading to wear. 5. Manufacturing quality issues with the bearing shells or shaft: Problems such as inadequate material, hardness, or machining precision of the bearing shells or shaft can all lead to wear. 6. Improper alignment and centering: If the engine is not assembled precisely, the shafts and bearing shells may not be on the same axis, resulting in uneven force distribution and wear. 7. Chronic fatigue: Prolonged exposure to mechanical vibrations, impact loads, and thermal expansion can lead to fatigue of the bearing shells, resulting in wear. When identifying and resolving wear issues, all the above factors should be taken into consideration, and appropriate measures should be taken for repair and prevention. .
There is a high possibility of an installation issue. It’s best to include a photo, showing the main unit along with the area that is damaged, to facilitate discussion. For reference.
During maintenance, pay attention to the alignment of the motor’s magnetic center line with the crankshaft’s installation position. When the motor rotor is at the magnetic center line, the axial offset of the crankshaft must be within the specified range. Additionally, when installing the flywheel and clutch disc, be sure not to force them into place
It’s mostly a coupling alignment issue; check that.