23. Crankshaft Balancer Clean and Inspect

Crankshaft Balancer Cleaning and Inspection





1. Clean the crankshaft balancer.
2. Clean the belt grooves of all dirt or debris with a wire brush.

Caution: Refer to Safety Glasses Caution in Service Precautions.

3. Dry the crankshaft balancer with compressed air.
4. Inspect the crankshaft balancer for the following: Worn, grooved, or damaged hub seal surface A crankshaft balancer hub seal surface with excessive scoring, grooves, rust or other damage must be replaced.

Important: In order for the belt to track properly, the belt grooves should be free of all dirt or debris.

^ Dirty or damaged belt grooves The balancer belt grooves should be free of any nicks, gouges, or other damage that may not allow the belt to track properly. Minor imperfections may be removed with a fine file.
^ Worn, chunking or deteriorated rubber between the hub and pulley

Crankshaft and Bearings Cleaning and Inspection

^ Tools Required
- J 7872 Magnetic Base Dial Indicator Set

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 OBD 11 system performance.





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

Caution: Refer to Safety Glasses Caution in Service Precautions.

3. Dry the crankshaft with compressed air.

Important: 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.

4. Perform a visual inspection of the crankshaft for damage.





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





9. Measure the crankshaft journals for out-of-round.
10. Measure the crankshaft journals for taper.





11. Measure the crankshaft runout.
Using wooden V blocks, 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. Replace the crankshaft if the measurements are not within specifications.





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 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.