Crankshaft: Service and Repair

Crankshaft Main Bearing Journal Diameter





1. Measure each of the crankshaft main bearing journal diameters in at least two directions.
^
^ If out of specification, install new components as necessary.

Crankshaft Main Bearing Journal Taper





1. Measure each of the crankshaft main bearing journal diameters in at least two directions at each end of the main bearing journal.
^
^ If out of specification, install new components as necessary.

Crankshaft Main Bearing Journal Clearance

Special Tools And Equipment:

Special tool(s)

NOTE: Crankshaft main bearing journals must be within specifications before checking journal clearance.

1. Remove the crankshaft main bearing caps and crankshaft main bearing.





2. Lay a piece of Plastigage across the face of each crankshaft main bearing surface.

3. NOTE: Do not turn the crankshaft while carrying out this procedure.

Install and remove the crankshaft main bearing cap.





4. Verify the crankshaft journal clearance.
^
^ If out of specification, install new components as necessary.

Crankshaft End Play

Special Tools And Equipment:

Special Tool(s)

1. Measure the crankshaft end play. Use a Dial Indicator Gauge with Holding Fixture to measure crankshaft end play.
2. Position the crankshaft to the rear of the cylinder block.
3. Zero the indicator.





4. Move the crankshaft to the front of the cylinder block. Note and record the crankshaft end play.
^ If crankshaft end play exceeds specifications, install a new crankshaft thrust washer or crankshaft thrust main bearing.

Crankshaft Runout

Special Tools And Equipment:

Special tool(s)






1. NOTE: Crankshaft main bearing journals must be within specifications before checking runout.

Use the Dial Indicator Gauge with Holding Fixture to measure the crankshaft runout.
^
^ Rotate the crankshaft and subtract the lowest dial indicator reading from the highest dial indicator reading to figure the crankshaft runout. If it is out of specification, install new components as necessary.

Crankshaft Connecting Rod Journal Taper, Out of Round





1. Measure the crankshaft connecting rod journal diameters in two directions perpendicular to one another at each end of the connecting rod journal. The difference in the measurements from one end to the other is the taper. Verify measurement is within the wear limit.
^
^ If out of specification, install new components as necessary.