Fitting Bearings
INSPECTIONVisually check the main and connecting rod bearing journals for wear, scuffs or scoring and replace if necessary.
CRANKSHAFT OIL CLEARANCE-MECHANICAL MEASUREMENT
Measure Crankshaft Journal O.D.:

Measure Main Bearing I.D.:

Measure the journal outside diameter and the main bearing inside diameter. If the clearance exceeds the specifications limit, replace the main bearing(s) and if necessary replace the crankshaft. Refer to Crankshaft Clearance Specification Chart.
PLASTIGAGE MEASUREMENT
1. Remove oil from journal and bearing shell.
2. Install crankshaft.
Measuring Clearance:

3. Cut Plastigage to same length as width of the bearing and place it in parallel with the journal axis.
Measure Oil Clearance With Plastigage:

CRANKSHAFT SPECIFICATION CHART
CAUTION: Do not rotate crankshaft or the Plastigage will be smeared.
4. Install the main bearing cap carefully and tighten the bolts to specified torque.
Measuring Clearance:

5. Carefully remove the bearing cap and measure the width of the Plastigage at the widest part using the scale on the Plastigage package. Refer to Crankshaft Clearance Specification Chart for proper clearances. Also see Measuring Main and Connecting Rod Bearing Clearance in Standard Service Procedures.
CRANKSHAFT BEARING INSTALLATION
When the bearings need replacing, select and install the proper bearing by the following procedure.
Crankshaft Size Identification:

1. Measure the crankshaft journal diameter and confirm its classification from the following. In the case of a bearing supplied as a service part, its identification color is painted at the position show in image.
NOTE: Service replacement parts have identification marks, but factory-assembled parts have no identification marks. Service crankshaft identification may have marks or paint at counterweights. Refer to Crankshaft Size Classification Chart.