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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Engine Mechanical - 4.6L - 1 Of 4) >> On-Vehicle Repair Instructions (1 Of 2) >> Camshaft Replacement - Left Side >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. 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 Side .
    2. Fig 1: Ensuring Camshaft Sprocket Drive Pins Are At Top Of Their Rotation
    GM517149Courtesy of GENERAL MOTORS CORP.
  2. Rotate the crankshaft to TDC of the # 1 cylinders compression stroke, both camshaft sprocket drive pins should be at the top of their rotation.
    3. Fig 2: Using Camshaft Holding Tool
    GM650538Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to CAMSHAFT HOLDING TOOL CAUTION .
  3. Install the J 44212  over the camshafts. See Special Tools .
    4. Fig 3: Using A Paint Stick To Create A Mark On The Timing Chain Link Adjacent To Each Camshaft Sprocket Timing Mark
    GM1275692Courtesy of GENERAL MOTORS CORP.
  4. Use a paint stick to create a mark (1) on the timing chain link adjacent to each camshaft sprocket timing mark (2, 3).
    5. Fig 4: Identifying Timing Chain Retention Tool Components
    GM1275725Courtesy of GENERAL MOTORS CORP.
  5. Install both EN 46327  (1) to the engine using the following step: See Special Tools .

    Rotate the wing nut (2) of the EN 46327  (3) to the top of its travel. See Special Tools .

    6. Fig 5: Positioning EN 46327 On Cylinder Head
    GM1275702Courtesy of GENERAL MOTORS CORP.
  6. Position the bottom retention tool on the cylinder head with the V-notch of the block (1) adjacent to the left exhaust camshaft sprocket and chain.
    7. Fig 6: Installing EN 46327 Hook End Into Secondary Timing Chain Link
    GM1275713Courtesy of GENERAL MOTORS CORP.
  7. Insert the hook end (2) into a secondary timing chain link as shown.
    8. Fig 7: Positioning EN 46327 On Cylinder Head
    GM1275702Courtesy of GENERAL MOTORS CORP.
  8. Rotate the wing nut until it contacts the retention tool block (1). DO NOT tighten the wing nut at this time.
    9. Fig 8: Identifying Timing Chain Retention Tool Components
    GM1275725Courtesy of GENERAL MOTORS CORP.
  9. Rotate the wing nut (2) of the EN 46327  (4) to the top of its travel. See Special Tools .
    10. Fig 9: Positioning Top Retention Tool On Cylinder Head
    GM1275703Courtesy of GENERAL MOTORS CORP.
  10. Position the top retention tool on the cylinder head with the V-notch of the block (1) adjacent to the left intake camshaft sprocket and chain.
    11. Fig 10: View Of Hook End In Secondary Timing Chain Link
    GM1275718Courtesy of GENERAL MOTORS CORP.
  11. Insert the hook end (2) into a secondary timing chain link as shown.
    12. Fig 11: Positioning Top Retention Tool On Cylinder Head
    GM1275703Courtesy of GENERAL MOTORS CORP.
  12. Rotate the wing nut until it contacts the retention tool block (1). Alternately tighten both wing nuts to retain the chain.
    13. Fig 12: Holding Camshaft
    GM749356Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Torque Reaction Against Timing Drive Chain Notice .
  13. Use an open wrench on the hex cast into the camshafts in order to prevent the camshafts from rotating when removing the camshaft sprocket bolts.
  14. Remove the camshaft sprocket bolts.
  15. Remove the camshaft sprockets.
    16. Fig 13: View of Camshaft Bearing Caps
    GM522860Courtesy of GENERAL MOTORS CORP.
  16. Alternately loosen the camshaft bearing cap bolts a few turns at a time until all valve spring pressure has been released.
  17. Remove the camshaft bearing caps.
  18. Remove the J 44212  from the camshafts. See Special Tools .
    19. Fig 14: View of Camshafts
    GM591912Courtesy of GENERAL MOTORS CORP.
  19. Remove the camshafts.
    20. Fig 15: Identifying Camshaft Followers
    GM609690Courtesy of GENERAL MOTORS CORP.
  20. Remove the camshaft followers.
  21. Clean and inspect the camshafts. Refer to Camshaft Cleaning and Inspection .
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