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When selecting crankshaft bearings for the Xiali engine, it's essential to pay attention to several key factors to ensure proper performance and longevity. The selection process should be based on the journal dimensions and the specific repair standards of the crankshaft. Once the crankshaft has been properly ground, the bearing must be chosen according to the standard repair specifications to maintain the correct clearance and fit.
Before installing a new bearing, it's crucial to check the roundness and taper of the bearing housing bore. These measurements should conform to the manufacturer's specifications, with deviations not exceeding 0.02mm. If the tolerances are out of range, this can lead to improper clearance between the bearing and the crankshaft journal, resulting in accelerated wear and potential damage.
When the bearing is installed, the upper and lower halves should protrude slightly above the bearing seat surface by 0.03–0.04mm. This ensures a tight fit, allowing the shaft to flex slightly and maintain good contact with the seat. It also enhances heat dissipation and prevents looseness during operation.
The bearing’s bottom plate teeth should be intact to prevent movement during operation, which could cause misalignment or oil supply issues. Additionally, the backside of the bearing should be smooth and free from any coatings or paper padding that might interfere with heat transfer.
In some cases, especially when using old bearings or if there's a mismatch between the bearing and the journal, a thin copper sheet may be placed on the opposite side of the bearing. However, this should be done carefully, ensuring that the oil holes remain unobstructed and the surface is properly flattened.
Proper installation and attention to these details will help extend the life of the crankshaft bearings and improve overall engine performance. Always follow the manufacturer's guidelines and use the correct tools and techniques to achieve the best results.
For more information on bearings and their applications, you can explore related topics such as common bearing disassembly methods, differences between ball and roller bearings, and the role of high-temperature bearing steel.