29. Crankshaft and Bearing Clean and Inspect

1. Using solvent to clean crankshaft.
2. Use compressed air to dry crankshaft.
3. Use a micrometer to measure crankshaft rod journals in two locations on front edge for the following conditions:
- Measure for out-of-round.
- Measure for taper.
- Measure for wear.
- Rod journal diameter (STD) 48.971 - 48.987 mm (1.927 - 1.928 inch)
4. Use a micrometer to measure crankshaft rod journals in middle for the following conditions:
- Measure for out-of-round.
- Measure for taper.
- Measure for wear.
- Rod journal diameter (STD) 48.971 - 48.987 mm (1.927 - 1.928 inch)
5. Use a micrometer to measure crankshaft rod journals in two locations on rear edge for the following conditions:
- Measure for out-of-round.
- Measure for taper.
- Measure for wear.
- Rod journal diameter (STD) 48.971 - 48.987 mm (1.927 - 1.928 inch)
6. Use a micrometer to measure crankshaft main journals in two locations on front edge for the following conditions:
- Measure for out-of-round.
- Measure for taper.
- Measure for undersize.
- Main journal max. out-of-round 0.03 mm (0.0012 inch)
7. Use a micrometer to measure crankshaft main journals in middle for the following conditions:
- Measure for out-of-round.
- Measure for taper.
- Measure for undersize.
- Main journal max. out-of-round 0.03 mm (0.0012 inch)
8. Use a micrometer to measure crankshaft main journals in two locations on rear edge for the following conditions:
- Measure for out-of-round.
- Measure for taper.
- Measure for undersize.
- Main journal max. out-of-round 0.03 mm (0.0012 inch)





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

IMPORTANT:
- Measure 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 bearing may be of a different size than the cap bearings. Check the appropriate color coding of the bearings.
- Return bearings to their EXACT location if bearings are to be reused.
- The cap bearings for the numbers 3 and 4 do not have oil journals.

IMPORTANT: DO NOT rotate the crankshaft while gauging plastic is between journal and crankshaft bearing.

16. Perform the following steps to measure crankshaft bearing:





a. Place a piece of gauging plastic full width of crankshaft bearing onto journal.
b. Measure all five bearing clearances at the same time.





c. Install crankshaft bearing caps exactly as removed.
d. Install crankshaft torsional bearing bridge exactly as removed.
- Torque:
Crankshaft Bearing Cap: 50 Nm (37 ft. lbs.) + 60° + 15°
Torsional Bearing Bridge Bolts: 20 Nm (15 ft. lbs.)





e. Remove crankshaft torsional bearing bridge.





f. Remove crankshaft torsional bearing caps.





g. Use the scale provided with gauging plastic to measure the gauging plastic at its widest point.
h. Replace with a standard bearing if gauging plastic shows an irregularity in crankshaft main bearing clearance exceeding bearing clearance specification or if an excessive clearance is evident and crankshaft main journal is within specification.
i. Always replace both upper and lower crankshaft bearings as a set.
j. Regrind crankshaft for use with an undersize bearing if clearance cannot be brought to specifications.
k. Crankshaft bearings are available for service in either the standard size, and two under sizes.





17. Perform the following steps to measure crankshaft end play:
a. Install crankshaft bearing caps.
b. Install crankshaft torsional bearing bridge.
c. Mount a dial indicator onto the back of engine block.
d. Move crankshaft forward and move crankshaft rearward.
e. Note total movement.
f. The crankshaft end play clearance specification is 0.01 - 0.76 mm (0.0004 - 0.0300 inch).
g. Replace thrust bearing if clearance is not within specification.