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Lower Crankcase Removal

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the main bearing bolts. Note the location of the single stud-end bolt (1) used to attach the oil pump pickup tube.
  2. Remove the oil scraper plate (2).
  3. Remove the lower crankcase perimeter bolts.
    Fig 1: Removing Oil Scraper Plate
    G01815151Courtesy of GENERAL MOTORS CORP.
    CAUTION: Use a plastic pry tool when prying case halves apart to prevent damage to the Upper and Lower Crankcase surface. Do not continue to push the pry tool in the crankcase as the Upper and Lower Crankcase halves separate. This may damage the sealing surface.
  4. Working on either side of the lower crankcase, separate the crankcase halves by alternately prying in the grooves provided until the lower crankcase is free of the dowel pins.
    Fig 2: Separating Crankcase
    G01815152Courtesy of GENERAL MOTORS CORP.
  5. Remove the lower crankcase.
    Fig 3: Removing Lower Crankcase
    G01815153Courtesy of GENERAL MOTORS CORP.
  6. Inspect the upper to lower crankcase seals for damage (cuts or tears) caused by mis-machined or damaged sealing surfaces.
  7. Remove and discard the upper-to-lower crankcase seals (1).
    Fig 4: Removing Upper-To-Lower Crankcase Seals
    G01815154Courtesy of GENERAL MOTORS CORP.
  8. Remove the crankshaft position sensor (1).
  9. Remove and discard the crankshaft position sensor O-ring.
    Fig 5: Removing Crankshaft Position Sensor
    G01815155Courtesy of GENERAL MOTORS CORP.
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