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Home >> GMC >> 2011 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Mechanical - 2.8L Or 3.0L - Repair Instructions - Off Vehicle (2 Of 5)) >> Crankshaft and Bearing Cleaning and Inspection >> Crankshaft Measurement >> Measurement Procedure

Measurement Procedure

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Crankshaft & Support
    GM1866879Courtesy of GENERAL MOTORS CORP.
  1. Using a suitable fixture, support the crankshaft.
    2. Fig 2: View of Tool J 7872 & Crankshaft
    GM1866880Courtesy of GENERAL MOTORS CORP.
  2. Install the GE 7872:  indicator.
  3. Measure the crankshaft runout using the GE 7872:  indicator. Refer to Engine Mechanical Specifications (LF1) or Engine Mechanical Specifications (LAU or LBW) .
    4. Fig 3: Identifying Crankshaft Thrust Wall Width & Surface
    GM1866882Courtesy of GENERAL MOTORS CORP.
  4. Measure the crankshaft thrust wall width (1) for wear using an inside micrometer. Refer to Engine Mechanical Specifications (LF1) or Engine Mechanical Specifications (LAU or LBW) .
  5. Measure the crankshaft thrust wall surface (2) for runout using the GE 7872:  indicator. Refer to Engine Mechanical Specifications (LF1) or Engine Mechanical Specifications (LAU or LBW) .
  6. If the crankshaft journals are damaged or worn beyond specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized main bearings available for service.
    7. Fig 4: Using Outside Micrometer To Inspect Crankshaft Main Journals
    GM1866883Courtesy of GENERAL MOTORS CORP.
  7. Inspect the crankshaft main journals for undersize, using an outside micrometer.
    8. Fig 5: View Of Micrometer & Crankshaft Journals
    GM1866884Courtesy of GENERAL MOTORS CORP.
  8. Inspect the crankpins for undersize using an outside micrometer.
  9. Compare your measurements with those listed in the Engine Mechanical Specifications (LF1) or Engine Mechanical Specifications (LAU or LBW) . If the crankpin journals are worn beyond the specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized connecting rod bearings available for service.
    10. Fig 6: Identifying Out-Of-Round Measurements
    GM53224Courtesy of GENERAL MOTORS CORP.
  10. Measure the main bearing and crankpin journals for out-of-round using the following procedure:
    1. Using an outside micrometer, measure the journal at the extreme front and rear locations on the journal. Call these points A and B.
    2. Measure the journal in 2 new locations exactly 90 degrees from the first points. Call these points C and D.
    3. Subtract A from C and B from D. The differences will indicate journal out-of-round.
    4. The out-of-round should not exceed 0.004 mm (0.00016 in) maximum.
    5. If the journals are worn beyond the specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized crankshaft and connecting rod bearings available for service.
  11. Measure the main bearing and crankpin journals for taper using the following procedure:
    1. Using an outside micrometer, measure the journal at the extreme front (A) and rear (B) of the journal parallel to the crankshaft centerline.
    2. Subtract the smallest from the largest measurement. The result will be the journal taper.
    3. If the main bearing journal taper exceeds 0.004 mm (0.00016 in), replace the crankshaft.
    4. If the journals are worn beyond the specifications, the crankshaft may be ground 0.25 mm (0.010 in). There is only 1 size of oversized crankshaft and connecting rod bearings available for service.
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