Micrometer Method For Crankshaft Bearings

1. Measure the crankshaft journal diameter with a micrometer in several places, approximately 90 degrees apart, and then average the measurements.
2. Determine the taper and the out-of-round of the crankshaft journal.





3. Install the crankshaft bearings into the engine block.





4. Install the crankshaft bearings into the crankshaft bearing caps.





5. Install the crankshaft bearing caps in the original positions and with the arrow on the crankshaft bearing caps in the direction of the front of the engine block.
6. Install the crankshaft bearing cap bolts.
Tighten the crankshaft bearing cap bolts on the first pass to 20 Nm (15 ft. lbs.).
Tighten the crankshaft bearing cap bolts on the final pass an additional 73 degrees using the J36660-A.
7. Measure the crankshaft bearing Inside Diameter (ID) at the top and the bottom using an inside micrometer.
8. In order to determine the crankshaft bearing clearance, subtract the journal diameter from the crankshaft bearing ID.
9. Compare the crankshaft bearing clearance to the specifications.
10. If the crankshaft bearing clearances exceeds specifications, install the new crankshaft bearings as follows:
1. Measure the crankshaft bearing Inside Diameter (ID) at the top and the bottom using an inside micrometer.
2. Compare the crankshaft bearing clearance to the specifications.
11. Replace or repair the crankshaft if the proper clearances cannot be obtained.