Should the Notches of Crankshaft Bearings Align?

[Griffin]

Crankshaft bearings are installed with their notches aligned. More details are as follows: 1. Introduction to the Crankshaft: The crankshaft is the most critical component in an engine. It receives the force transmitted by the connecting rod and converts it into torque, which is then output through the crankshaft to drive other engine accessories. The crankshaft is subjected to centrifugal forces from rotating masses, periodically varying gas inertial forces, and reciprocating inertial forces, resulting in bending and torsional loads. Therefore, the crankshaft must have sufficient strength and stiffness, with journal surfaces that are wear-resistant, operate uniformly, and maintain good balance. 2. Introduction to Connecting Rod Bearings: Connecting rod bearings include the upper and lower connecting rod bearings, which are installed at the junction of the connecting rod and the crankshaft, serving functions such as wear resistance, connection, support, and transmission. During assembly, the markings on the upper and lower bearings must not be mismatched, the bearing notch directions must not be reversed, and the bolts must be tightened to the specified torque.