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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 419 (Engine Mechanical - 3.5L (On-Vehicle)) >> Repair Instructions >> Oil Pump Replacement >> 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 engine front cover. Refer to Engine Front Cover Replacement .
  2. Remove the camshaft covers. Refer to Camshaft Cover Replacement - Left  and Camshaft Cover Replacement - Right  .

    Important:  You must install the J 42038  immediately after cam cover removal. The fixtures prevent unexpected camshaft rotation caused by valve spring pressure.

  3. Install the camshaft holding fixture J 42038  onto the ends of the camshaft. Rotate the engine to align the camshafts with the tool using the hex in the camshaft and an open wrench.
    Fig 1: Installing Camshaft Holding Fixture J 42038
    G01816723Courtesy of GENERAL MOTORS CORP.
  4. When installed properly, the J 42038  will be fully seated on the camshaft ends with the camshaft flats parallel to the cam cover sealing surface.
  5. Remove the oil pan. Refer to Oil Pan Replacement .
  6. Remove the oil pump pipe and screen. Refer to Oil Pump Pipe and Screen Assembly Replacement .
    Fig 2: Identifying J 42038 Installation Position
    G01816724Courtesy of GENERAL MOTORS CORP.
  7. Remove the camshaft drive chain tensioner (1) in order to remove the primary camshaft drive chain from the drive sprocket. Refer to Primary Camshaft Drive Chain Tensioner Replacement .
    Fig 3: Removing Camshaft Drive Chain Tensioner
    G01816725Courtesy of GENERAL MOTORS CORP.
  8. Remove the 4 oil pump assembly retaining bolts identified by the larger head size.
  9. Slide the oil pump assembly off the nose of the crankshaft with the drive sprocket in place.
    Fig 4: Removing Oil Pump Assembly
    G01816726Courtesy of GENERAL MOTORS CORP.
  10. Remove the crankshaft sprocket from the oil pump assembly.
    11. Fig 5: Removing Crankshaft Sprocket From Oil Pump Assembly
    G01816727Courtesy of GENERAL MOTORS CORP.
  11. If necessary, disassemble the oil pump. Refer to OIL PUMP DISASSEMBLE .
  12. Clean and inspect the oil pump. Refer to OIL PUMP CLEANING AND INSPECTION in Engine Mechanical-3.5L Unit Repair.
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