Crankshaft bearing cap location scheme

An improved bearing assembly for journaling a shaft of the type including a saddle member and a bearing cap, each of which includes shaft-receiving, semi-cylindrical recesses whose ends are mutually alignable to define a shaft-receiving cylindrical bore when the saddle member and bearing cap are assembled together, wherein the improvement comprises mounting shoulders on either end of the bearing cap which are receivable within alignment slots on either side of the shaft-receiving recess of the saddle member of generally the same shape as the shoulders they receive, with the mounting shoulders are unsymmetrical in shape relative to the axis of rotation of the semi-cylindrical recess of the bearing cap in order to provide only one possible fitting orientation between the mounting shoulders and the alignment slots of the saddle member which receive them when said member and cap are assembled, wherein said bearing cap contains a first bore opening into one of said shoulders which is aligned with a second bore contained in said saddle member when said saddle member and bearing cap are fitted together, and a first bolt having a pilot portion whose outer diameter is formed to mate with the inner diameter of said bore for providing proper positioning of the saddle member and the bearing cap along the center of curvature of the respective semi-cylindrical recesses, and further including a third bore opening into the other of said shoulders which is aligned with a fourth bore contained in the saddle member when said saddle member and bearing cap are fitted together, and a second bolt whose diameter is less than the diameter of the third bore for clamping said other shoulder into said alignment slot and thereby completing the assembly of the bearing.