Direction of the Connecting Rod Bearing Notch?
2 Answers
The direction of the connecting rod bearing notch is actually towards the oil pump, primarily serving to lubricate the engine connecting rod. The connecting rod bearing is divided into two parts: the upper bearing and the lower bearing, installed at the connection point between the connecting rod and the crankshaft, thus providing wear resistance, support, and transmission functions. More details about the connecting rod bearing are as follows: 1. Detail one: The inner cylindrical surface of the upper connecting rod bearing is circumferentially equipped with an oil groove of reasonable arc length, and the bearing wall at the oil groove section is provided with an oil passage hole, which is the notch mentioned in this article. Additionally, assembly can be guided by the position of the locating lip. Bearings without a locating lip can be used on connecting rods with a locating lip, but the reverse is not possible. 2. Detail two: When assembling the connecting rod bearing, do not reverse the direction, as this can cause varying degrees of impact. Furthermore, the screws must reach the corresponding torque, but avoid over-tightening, as this can lead to excessive stress on the bolts, not only causing internal thread stripping but also potentially deforming the bolts.
I often encountered the issue of connecting rod bearing notch orientation when repairing engines. During installation, the notch should face the oil passage direction, usually upward or toward the main bearing, to ensure optimal lubrication. Once, a client of mine didn't pay attention and installed it backward, resulting in insufficient oil supply to the bearing, rapid wear, and engine failure within a month, leading to an expensive overhaul. I recommend referring to the original position or service manual markings when replacing new bearing shells, rather than relying on intuition. Although this detail seems minor, it's crucial for the engine's overall lifespan. Regular maintenance checks can save both hassle and money. Personally, I always use a marker pen to mark positions to prevent mistakes during work.
