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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Engine Mechanical - 4.0L (On-Vehicle)) >> Repair Instructions >> Camshaft Replacement - Left >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the left camshaft cover. Refer to Camshaft Cover Replacement - Left .
  2. Rotate the crankshaft using the J 39946  to TDC of the # 1 cylinders compression stroke, both camshaft sprocket drive pins should be at the top of their rotation.
    Fig 1: Identifying Sprocket Drive Pins At Top Rotation
    G01819437Courtesy of GENERAL MOTORS CORP.
    WARNING: The camshaft holding tools must be installed on the camshafts to prevent camshaft rotation. When performing service to the valve train and/or timing components, valve spring pressure can cause the camshafts to rotate unexpectedly and can cause personal injury
  3. Install the J 44212  over the camshafts.
    Fig 2: Installing J 44212
    G01819438Courtesy of GENERAL MOTORS CORP.
  4. Use an open end wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when removing the camshaft sprocket bolts.
    Fig 3: Using Open End Wrench On Hex Cast
    G01819439Courtesy of GENERAL MOTORS CORP.
  5. Remove the camshaft sprocket bolts.
    Fig 4: Removing Camshaft Sprocket Bolts
    G01819440Courtesy of GENERAL MOTORS CORP.
  6. Install the J 44213  (1) onto the front rail of the cylinder head.
    Fig 5: Installing J 44213
    G01819441Courtesy of GENERAL MOTORS CORP.
  7. Remove the left secondary camshaft drive chain shoe access plug.
    Fig 6: Removing Left Secondary Camshaft Drive Chain Shoe Access Plug
    G01819442Courtesy of GENERAL MOTORS CORP.
  8. Loosen the left secondary camshaft drive chain shoe bolt 2 full turns ONLY.
    Fig 7: Loosening Left Secondary Camshaft Drive Chain Shoe Bolt
    G01819443Courtesy of GENERAL MOTORS CORP.
  9. Slide the intake and exhaust camshaft sprockets onto the pins of the J 44213. 
    Fig 8: Sliding Intake & Exhaust Camshaft Sprockets Onto J 44213 Pins
    G01819444Courtesy of GENERAL MOTORS CORP.
  10. Alternately loosen the camshaft bearing cap bolts a few turns at a time until all valve spring pressure has been released.
  11. Remove the camshaft bearing caps.
  12. Remove the J 44212  from the camshafts.
    Fig 9: Removing Camshaft Bearing Caps
    G01819445Courtesy of GENERAL MOTORS CORP.
  13. Remove the camshafts.
    Fig 10: Removing Camshafts
    G01819446Courtesy of GENERAL MOTORS CORP.
  14. Remove the camshaft followers.
  15. Clean and inspect the camshafts. Refer to CAMSHAFT CLEANING AND INSPECTION .
    Fig 11: Removing Camshaft Followers
    G01819447Courtesy of GENERAL MOTORS CORP.
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