Crankshaft and Bearings Clean and Inspect

Crankshaft and Bearings Cleaning and Inspection

Tools Required
- J 6125-1B Slide Hammer
- J 7872 Magnetic Base Dial Indicator Set
- J 36660-A Torque Angle Meter
- J 41818 Crankshaft Bearing Cap Remover
- J 43690 Rod Bearing Checking Tool
- J 43690-100 Rod Bearing Checking Tool - Adapter Kit

Cleaning Procedure







Important: 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 On-Board Diagnostics (OBD) II system performance.

1. Clean the crankshaft with solvent.
2. Thoroughly clean all oil passages and inspect for restrictions or burrs.

CAUTION: Wear safety glasses in order to avoid eye damage.

3. Dry the crankshaft with compressed air.

Inspection Procedure

Important: The 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 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 thrust wall width.
A crankshaft with a thrust wall width in excess of 26.2 mm (1.0315 inch) must be replaced.
11. Measure the crankshaft runout.
Use wooden V blocks or a fixture to support the crankshaft on the front and rear journals.







12. Use the J 7872 in order to measure the crankshaft runout at the front and rear intermediate journals.
13. Use the J 7872 in order to measure the runout of the crankshaft rear flange.
14. Use the J 7872 in order to measure the runout of the crankshaft position reluctor ring. Reluctor ring runout should be measured 1.0 mm (0.04 inch) below the ring teeth.
If the reluctor ring has runout in excess of 0.7 mm (0.028 inch), replace the crankshaft.







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







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







18. Inspect the crankshaft bearings for improper seating indicated by bright, polished sections of the bearing.
If the lower had 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.