30. Crankshaft and Bearing Clean and Inspect

1. Use solvent to clean the crankshaft.
2. Use compressed air to dry the crankshaft.
3. Use a micrometer to measure the crankshaft rod journals in two locations (1, 2) on the front edge for the following conditions:
^ Measure for out-of-round.
^ Measure for taper.
^ Measure for wear.
^ Refer to Fastener Tightening Specifications.
4. Use a micrometer to measure the crankshaft rod journals in the middle for the following conditions:
^ Measure for out-of-round.
^ Measure for taper.
^ Measure for wear.
^ Refer to Fastener Tightening Specifications.
5. Use a micrometer to measure the crankshaft rod journals in two locations (1,2) on the rear edge for the following conditions:
^ Measure for out-of-round.
^ Measure for taper.
^ Measure for wear.
^ Refer to Fastener Tightening Specifications.
6. Use a micrometer to measure the crankshaft main journals in two locations (1,2) on the front edge for the following conditions:
^ Measure for out-of-round.
^ Measure for taper.
^ Measure for undersize.
^ Refer to Fastener Tightening Specifications.
7. Use a micrometer to measure the crankshaft main journals in the middle for the following conditions:
^ Measure for out-of-round.
^ Measure for taper.
^ Measure for undersize.
^ Refer to Fastener Tightening Specifications.
8. Use a micrometer to measure the crankshaft main journals in two locations (1,2) on the rear edge for the following conditions:
^ Measure for out-of-round.
^ Measure for taper.
^ Measure for undersize.
^ Refer to Fastener Tightening Specifications.





9. Use a dial indicator to measure the crankshaft run-out at the front intermediate journals and use a micrometer to measure the crankshaft run-out at the rear intermediate journals. Perform the measurement with the crankshaft in the engine block or perform the measurement by supporting the crankshaft front and rear journals on V-blocks.
10. Replace or recondition the crankshaft if the measurements are not within specifications.
11. Inspect the crankshaft bearing fit.
12. Inspect the upper half of the crankshaft bearing.
13. Replace the upper bearing half and the lower half if the upper bearing half is worn and/or damaged.
14. Inspect the lower half of the crankshaft bearing.
15. Replace the upper bearing half and the lower half if the lower bearing half is worn and/or damaged.

Important:
^ Measure the clearance of each crankshaft bearing to determine proper sizes.
^ Factory installed crankshaft bearings may not be the same size for each journal and/or the block bearings may be of a different size than the cap bearings. Check the appropriate color coding of the bearings.
^ Return the bearings to their EXACT location if the bearings are to be reused.
^ The number 3 and the number 4 cap bearings do not have oil journals.
^ DO NOT rotate the crankshaft while gauging plastic is between the journal and the crankshaft bearing.





16. Perform the following steps to measure the crankshaft bearing:
16.1. Measure all five bearing clearances at the same time.
16.2. Place a piece of gauging plastic, the full width of crankshaft bearing, onto the journals.
16.3. Install the crankshaft bearing caps exactly as removed.
16.4. Install the crankshaft bearing bridge exactly as removed.
Tighten
^ Tighten the crankshaft bearing cap bolts to 50 Nm (37 ft. lbs.) + 60 degrees + 15 degrees.
^ Tighten the crankshaft bearing bridge bolts to 20 Nm (15 ft. lbs.).
16.5. Remove the crankshaft bearing bridge.
16.6. Remove the crankshaft bearing caps.
16.7. Use the scale provided with the gauging plastic to measure the gauging plastic at its widest point. Refer to Fastener Tightening Specifications.
16.8. Replace with a standard bearing if the gauging plastic shows an irregularity in the crankshaft main bearing clearance exceeding 0.025 mm (0.0010 inch) or if an excessive clearance is evident and the crankshaft main journal is within specification.
16.9. Always replace both the upper and the lower crankshaft bearings as a set.
16.10. Regrind the crankshaft for use with an undersize bearing if the clearance cannot be brought to specifications.
16.11. Crankshaft bearings are available for service in the standard size, 0.25 mm (0.010 inch) undersize and 0.50 mm (0.020 inch) undersize.





17. Perform the following steps to measure the crankshaft end play:
^ Install the crankshaft bearing caps.
^ Install the crankshaft torsional bearing bridge.
^ Mount a dial indicator onto the back of the engine block.
^ Move the crankshaft foreword and move the crankshaft rearward.
^ Note the total movement.
^ The crankshaft end play clearance specification is 0.010 - 0.76 mm (0.0004 - 0.0300 inch).
^ Replace the thrust bearing if the clearance is not within specification.