Crankshaft Main Bearing Journal Clearance

Crankshaft Main Bearing Journal Clearance

NOTE: Verify that these 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.

1. Position on a length of Plastigage(R) 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(R), equal to the width of the bearing, on the bearing journal.





NOTE: Measure all the bearings at the same time.

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

NOTE: Do not hit the lower crankcase.

3. Remove the lower crankcase with bearing shells.
4. Read off the measurement.
^ Compare the length of Plastigage(R) with the Plastigage(R) 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.