Inspect Crankshaft Journals and Bearings

^ Tools Required, or equivalent - J 7872 Magnetic Base Dial Indicator Set.

CAUTION: Use care when handling the crankshaft. Avoid damage to the bearing surfaces or the lobes of the crankshaft position reluctor ring. Damage to the teeth of the crankshaft position reluctor ring may effect OBD II system performance. Reluctor ring teeth should not have imperfections on the rising or falling edges. Imperfections of the reluctor ring teeth may effect OBD II system performance.





1. Perform a visual inspection of the crankshaft for damage.
2. Inspect the crankshaft position reluctor ring lobes of the for damage.





3. Inspect the crankshaft journals for wear (1). Journals should be smooth with no signs of scoring, wear, or damage.
4. Inspect the crankshaft journals for grooves or scoring (2).
5. Inspect the crankshaft journals for scratches or wear (3).
6. Inspect the crankshaft journals for pitting or imbedded bearing material (4).





7. Inspect the crankshaft key (1), keyway (2), and threaded hole (3) for damage.





8. Measure the crankpins for the out-of-round
9. Measure the crankpins for taper.






10. Measure the crankshaft runout. Using wooden V blocks, support the crankshaft on the front and rear journals.
11. Use the magnetic base dial indicator set in order to measure the crankshaft runout at the front and rear intermediate journals.
12. Use the magnetic base dial indicator set in order to measure the runout of the crankshaft rear flange.
13. Use the magnetic base dial indicator set in order to measure the runout of the crankshaft position reluctor ring. Reluctor ring runout should be measured 1.0 mm (0.03937 inch) below the ring teeth.
a. Compare the measurements to Engine Mechanical Specifications.
b. Replace or repair the crankshaft if the measurements are not within the specifications.

NOTE: A loose or damaged crankshaft oil gallery plug must be replaced.





14. Inspect the rear crankshaft oil gallery plug for a loose fit or leaking.





15. Install a NEW clutch pilot bearing. A properly installed clutch pilot bearing will be installed until flush to the rear face of the crankshaft.





16. Inspect crankshaft bearings for craters or pockets. Flattened sections on the bearing halves also indicate fatigue.





17. Inspect the crankshaft bearings for excessive scoring or discoloration.
18. Inspect the crankshaft bearings for dirt or debris imbedded into the bearing material.





19. Inspect the crankshaft bearings for improper seating indicated by bright, polished sections of the bearing. If the lower half of the bearing is worn or damaged, both upper and lower halves should be replaced. Generally, if the lower half is suitable for use, the upper half should also be suitable for use.