Fitting Bearings

Main Bearing Journal Measurement

Measure Connecting Rod Journal O.D.:

Measure the journal outside diameter. If the clearance exceeds the specifications limit. Replace the main bearing(s) and if necessary replace the crankshaft.

Plastigage Measurement
1. Remove oil from journal and bearing shell.
2. Install crankshaft.

Measure Oil Clearence With Plastigage:

3. Cut plastigage to same length as width of the bearing and place it in parallel with the journal axis.
4. Install the main bearing cap carefully and tighten the bolts to specified torque.

CAUTION: Do not rotate crankshaft or the plastigage will be smeared.

Measuring Clearence:

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 Specification Chart for proper clearance. Also see Measuring Main and Connecting Rod Bearing Clearances in Standard Service Information.





Crankshaft Specification Chart

Crankshaft Bearing Installation
When the bearings need replacing, select and install the proper bearing by the following procedure.

Bearing Identification:

1. Measure the crankshaft journal diameter and confirm its classification from the Crankshaft Size Classification Chart. In the case of a bearing supplied as a service part, its identification color is painted at the position.

Crankshaft Size Identification (Part 1 Of 2):

Crankshaft Size Identification (Part 2 Of 2):

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.