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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 638 (Engine Mechanical - 4.0L (Unit Repair)) >> Repair Instructions >> Lower Crankcase Removal

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 transaxle brace (1) retaining bolts.
  2. Remove the transaxle brace (1).
    Fig 1: Removing Transaxle Brace
    G01815824Courtesy of GENERAL MOTORS CORP.
  3. Remove the 2 crankshaft position sensors (1, 2).
    Fig 2: Removing Crankshaft Position Sensors
    G01815825Courtesy of GENERAL MOTORS CORP.
  4. Remove the 4 lower crankcase perimeter retaining bolts along the right side of the engine.
    Fig 3: Removing Right Side Lower Crankcase Perimeter Retaining Bolts
    G01815826Courtesy of GENERAL MOTORS CORP.
  5. Remove the 4 lower crankcase perimeter retaining bolts along the left side of the engine.
    Fig 4: Removing Left Side Lower Crankcase Perimeter Retaining Bolts
    G01815827Courtesy of GENERAL MOTORS CORP.
  6. Remove the main bearing bolts. Note the location of the single stud-end bolt (1) used to attach the oil pump pickup tube.
  7. Remove the oil scraper plate.
    Fig 5: Removing Oil Scraper Plate
    G01815828Courtesy of GENERAL MOTORS CORP.
  8. Remove the oil manifold plate bolts.
  9. Remove the oil manifold plate.
    Fig 6: Remove Oil Manifold Plate
    G01815829Courtesy 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.
  10. 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 7: Separating Crankcase Halves
    G01815830Courtesy of GENERAL MOTORS CORP.
  11. Remove the lower crankcase.
    Fig 8: Removing Lower Crankcase
    G01815831Courtesy of GENERAL MOTORS CORP.
  12. Inspect the upper-to-lower crankcase seal. The upper-to-lower crankcase seal may be reused unless it is damaged or comes out of its groove in the upper crankcase.
  13. Try to save the seal for inspection procedures.
  14. Remove and discard the rear crankshaft seal from the end of the crankshaft.
    Fig 9: Removing Rear Crankshaft Seal
    G01815832Courtesy of GENERAL MOTORS CORP.
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