Crankshaft Inspection
WARNING: This page is about a different car, the 2025 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
- Clean the oil off the bearing journals.
- Use a micrometer to correctly measure the outside diameter of the main bearing journals.
1 - Micrometer 2 - Main Bearing Journal - Measure the outside diameter at two locations (each end of the journal).
- Rotate the crankshaft 90° and repeat the two measurements.
1 - Micrometer 2 - Main Bearing Journal - For main bearing journals, verify that the maximum taper and maximum out of round are within specifications. Refer to: ENGINE SPECIFICATIONS .
- Compare the measured main bearing journal diameter to the crankshaft main bearing journal diameter grade marking chart. Refer to: MAIN BEARING SELECTION . Obtain the main bearing journal grade identification marks from the engine block and select the upper and lower main bearing sizes that will provide the proper oil clearance.
- Use a micrometer to correctly measure the outside diameter of the connecting rod journals.
1 - Micrometer 2 - Connecting Rod Journal - Measure the outside diameter at two locations (each end of the journal).
- Rotate the crankshaft 90° and repeat the two measurements.
1 - Micrometer 2 - Connecting Rod Journal - For connecting rod journals, verify that the maximum taper and maximum out of round are within specifications. Refer to: ENGINE SPECIFICATIONS .
- Compare the measured rod journal diameter to the crankshaft connecting rod bearing journal diameter grade marking chart. Refer to: CONNECTING ROD BEARING FITTING . Select the bearing size that corresponds to the crankshaft markings for each rod bearing journal that will provide the proper oil clearance.