How to Select Main Bearing
HOW TO SELECT MAIN BEARINGWhen New Cylinder Block and Crankshaft are Used
1. Main Bearing Selection Table rows correspond to bearing housing grade on rear left side of cylinder block.
2. Main Bearing Selection Table columns correspond to journal diameter grade on front side of crankshaft.
3. Select main bearing grade at the point where selected row and column meet in Main Bearing Selection Table.
When Cylinder Block and Crankshaft are Reused
1. Measure cylinder block main bearing housing inner diameter and crankshaft main journal diameter.
2. Correspond the measured dimension in Cylinder block main bearing housing inner diameter row of Main Bearing Selection Table.
3. Correspond the measured dimension in Crankshaft main journal diameter column of Main Bearing Selection Table.
4. Select main bearing grade at the point where selected row and column meet in following selection table.
Undersize Bearing Usage Guide
^ When the specified main bearing oil clearance is not obtained with standard size main bearings, use underside (US) bearing.
^ When using undersize (US) bearing, measure the main bearing inner diameter with bearing installed, and grind main journal so that the main bearing oil clearance satisfies the standard.
CAUTION: In grinding crankshaft main journal to use undersize bearings, keep the fillet R [1.5 - 1.7 mm (0.059 - 0.067 inch)].
