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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 >> Installation Procedure

Installation 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. If necessary, assemble the oil pump. Refer to OIL PUMP ASSEMBLE .
  2. Align the crankshaft sprocket splines with the oil pump gerotor and install the sprocket in the oil pump.
    Fig 1: Installing Crankshaft Sprocket In Oil Pump
    G01816728Courtesy of GENERAL MOTORS CORP.
  3. Place the pump and sprocket assembly in position by rotating the crankshaft sprocket until the machined slot (2) is indexed with the drive pin (1) in the crankshaft.
    Fig 2: Identifying Sprocket Installation Position
    G01816729Courtesy of GENERAL MOTORS CORP.
  4. Slide the pump and sprocket onto the crankshaft until a positive stop is felt. Make sure the crankshaft sprocket is aligned with the drive pin in the crankshaft.
  5. Install the oil pump pipe and screen. Refer to Oil Pump Pipe and Screen Assembly Replacement .
  6. Install the oil pan. Refer to Oil Pan Replacement .
    Fig 3: Installing Oil Pump & Sprocket
    G01816730Courtesy of GENERAL MOTORS CORP.
  7. When properly installed, the crankshaft sprocket will protrude from the oil pump but the face of the sprocket will be located behind the machined step in the crankshaft as shown.
  8. Align the pump body with the mounting holes in the cylinder block.
    CAUTION: Refer to FASTENER NOTICE in Cautions and Notices.
  9. Install the oil pump retaining bolts.

    Tighten 

    Tighten the oil pump retaining bolts to 25 N.m (18 lb ft).

  10. Install the primary camshaft drive chain over the drive sprocket. Refer to Primary Camshaft Drive Chain Tensioner Replacement .

    Important:  Make sure correct primary and secondary camshaft drive chain timing are maintained.

    Fig 4: Identifying Crankshaft Sprocket Installation Position
    G01816731Courtesy of GENERAL MOTORS CORP.
  11. Install the camshaft drive chain tensioner (1).
    Fig 5: Installing Camshaft Drive Chain Tensioner
    G01816732Courtesy of GENERAL MOTORS CORP.
  12. Remove the J 42038  from the cylinder heads.
  13. Install the camshaft covers. Refer to Camshaft Cover Replacement - Left  and Camshaft Cover Replacement - Right  .
  14. Install the engine front cover. Refer to Engine Front Cover Replacement .
    Fig 6: Locating J 42038
    G01816733Courtesy of GENERAL MOTORS CORP.
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