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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical - 5.3L) >> Repair Instructions - Off Vehicle >> Crankshaft and Bearing Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

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    Fig 1: View Of Reluctor Ring Teeth
    GM1552554Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The reluctor ring teeth should not have imperfections on the rising or falling edges. Imperfections of the reluctor ring teeth may affect OBD II system performance.
  1. Perform a visual inspection of the crankshaft for damage.
  2. Inspect the CKP reluctor ring teeth (1) for damage.
    3. Fig 2: Inspecting Crankshaft Journals For Wear
    GM1552446Courtesy of GENERAL MOTORS CORP.
  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 rear oil seal surface (5) for grooves or scoring.
    8. Fig 3: View Of Crankshaft Key, Keyway & Threaded Hole
    GM1272849Courtesy of GENERAL MOTORS CORP.
  8. Inspect the crankshaft key (122), keyway (1), and threaded hole (2) for damage.
    9. Fig 4: Measuring Connecting Rod Journals For Out-Of-Round & Taper
    GM1552447Courtesy of GENERAL MOTORS CORP.
  9. Measure the crankpins for the out-of-round.
  10. Measure the crankpins for taper.
    11. Fig 5: Measuring Crankshaft Thrust Wall Width
    GM1552449Courtesy of GENERAL MOTORS CORP.
  11. Measure the crankshaft thrust wall width (a).

    A crankshaft with a thrust wall width in excess of 26.2 mm (1.0315 in) must be replaced.

    12. Fig 6: Measuring Crankshaft Runout
    GM1552450Courtesy of GENERAL MOTORS CORP.
  12. Measure the crankshaft runout.

    Use wooden V-blocks or a fixture to support the crankshaft on the front and rear journals.

  13. Use the J 7872  in order to measure the crankshaft runout at the front and rear intermediate journals.
  14. Use the J 7872  in order to measure the runout of the crankshaft rear flange.
  15. 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 in) below the ring teeth.

    If the reluctor ring has runout in excess of 0.7 mm (0.028 in), replace the crankshaft.

    16. Fig 7: Identifying Crankshaft Bearing Craters Or Pockets
    GM52051Courtesy of GENERAL MOTORS CORP.
  16. Inspect crankshaft bearings for craters or pockets. Flattened sections on the bearing halves also indicate fatigue.
    17. Fig 8: Inspecting Connecting Rod Bearings For Excess Scoring Or Discoloration
    GM52053Courtesy of GENERAL MOTORS CORP.
  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. Fig 9: View of Crankshaft Bearing Polished Sections (Improper Seating)
    GM52056Courtesy of GENERAL MOTORS CORP.
  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.

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