Modern engines, especially small ones, have thin wear-resistant alloys on the main bearings and connecting rod bearings, and absolutely do not allow scratching. Some hyperboloid face bearings or elliptical face bearings used on imported engines are strictly forbidden to be repaired according to the cylindrical shape, otherwise their performance will be impaired, leading to early damage of the bearing and even the occurrence of a bush bearing axis accident. This type of bearing can only be selected according to its corresponding size. If there is no suitable size, the crankshaft must be ground by a base hole method in order to obtain a suitable fit clearance.
In addition, in the assembly of such non-scavenged bearings, must strictly check the position error of the seat hole and the concentricity error of each hole exceeds the allowable limit, should be promptly repaired, otherwise it will produce uneven wear, rolling or The consequences such as shaft holding may even cause the crankshaft to deform or break.
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