Aerio AWD L4-2.0L (2003)
1) Fit main bearings to cylinder block (1).
One of two halves of main bearing (4) has oil groove (3).
Install this half with oil groove to cylinder block and another half without oil groove to lower crankcase.
Make sure that two halves are painted in the same color.
2) Install O-ring (2) to cylinder block.
3) Fit thrust bearings (1) to cylinder block between No.2 and No.3 cylinders. Face oil groove (2) sides to crank webs.