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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Crankshaft and Bearings Removal

Crankshaft and Bearings Removal

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: In order to prevent damage to the crankshaft position (CKP) sensor reluctor wheel/ring care must be used when removing or installing this component.
    IMPORTANT: The crankshaft position (CKP) sensor is designed to contact the reluctor wheel of the crankshaft. Wear may be noticeable on the end of the sensor.
  1. Remove the CKP sensor bolt.
    2. Fig 1: View Of CKP Sensor & Bolt
    GM1150725Courtesy of GENERAL MOTORS CORP.
  2. Apply penetrating oil to the CKP sensor-to-engine block mating surface. Allow the penetrating oil to soak for several minutes, to help loosen the O-ring from the engine block.
  3. Twist the sensor to loosen the O-ring seal. When removing the sensor, pull the sensor straight out of the engine block at the same angle the sensor was installed.
  4. Inspect both CKP sensor O-ring for cuts, cracks, tears or damage. Replace the O-ring as needed.
    5. IMPORTANT: Crankshaft bearing caps are machined with the engine block for the proper clearances. Mark or identify each crankshaft bearing cap location and direction before removal. Crankshaft bearing caps must be installed in their original locations.
  5. Remove the crankshaft bearing cap bolts and studs.
    6. Fig 2: View Of Crankshaft Bearing Cap Bolts & Studs
    GM471055Courtesy of GENERAL MOTORS CORP.
  6. Remove the crankshaft bearing caps.
  7. Remove the crankshaft lower bearings from the crankshaft bearing caps.
    8. Fig 3: View Of Crankshaft Lower Bearing & Bearing Caps
    GM471044Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Care should be taken when removing the crankshaft so that the CKP sensor reluctor ring is not damaged.
  8. Remove the crankshaft.
    9. Fig 4: View Of Crankshaft
    GM471047Courtesy of GENERAL MOTORS CORP.
  9. Remove the crankshaft upper bearings from the engine block.
    10. Fig 5: View Of Crankshaft Upper Bearings
    GM471041Courtesy of GENERAL MOTORS CORP.
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