Main Bearings Inspection: Notes

NOTE: Before inspecting main bearings, note the following points.

Service main bearings are available in standard size and 0.25 mm (0.0098 in.) undersize, and each of them has 5 kinds of bearings differing in tolerance.
Upper half of bearing (1) has oil groove (2) as shown in the figure. Install this half with oil groove toward cylinder block.

Fig 1: Locating Upper Half Of Main Bearing Oil Groove
Courtesy of SUZUKI OF AMERICA CORP.
Lower half of bearing does not have oil groove.