Aerio L4-2.3L (2006)
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Upper half of bearing (1) has oil groove (2) as shown in figure. Install this half with oil groove to cylinder block.
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Lower half of bearing does not have oil groove.
Main bearings inspection
Check bearings for pitting, scratches, wear or damage.
If any malcondition is found, replace both upper and lower halves. Never replace either half without replacing the other half.
Main bearing clearance
Check clearance by using gauging plastic.
1) Remove lower crankcase.
2) Clean bearings and main journals.
3) Place a piece of gauging plastic (1) to full width of bearing (parallel to crankshaft) on journal, avoiding oil hole.
4) Install lower crankcase to cylinder block.
NOTE: Do not rotate crankshaft while gauging plastic is installed.
