Crankshaft Main Bearing Journal Clearance

Crankshaft Main Bearing Journal Clearance

1. NOTE: Verify that the following stages are followed exactly. The crankshaft must be to specification.

NOTE: The bearing shells and journals must be free from engine oil and dirt.

NOTE: The measuring point should be near to the center.





Position on a length of Plastigage on the bearing journal.
^ Insert the associated bearing shells, without lubrication, into the cylinder block.
^ Insert the crankshaft, without lubrication, into the cylinder block.
^ Position a strip of Plastigage, equal to the width of the bearing, on the bearing journal.

2. NOTE: Measure all the bearings at the same time.

Carry out the measurement.
^ Install the lower crankcase with bearing shells following the relevant tightening sequence.

3. NOTE: Do not hit the lower crankcase.

Remove the lower crankcase with bearing shells.





4. Read off the measurement.
^ Compare the length of plastigage with the Plastigage scale.
^ The value that is read off is the bearing clearance.
^ If the measurement is out of the specified range, change the bearing shells and repeat the measurement.