GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 S10 Pickup - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Oil Pump Assemble

Tools Required

J 21882 Oil Suction Pipe Installer


    Object Number: 30401 Size: SH
  1. Apply clean engine oil to the oil pump pressure relief valve, oil pump pressure relief valve spring, and oil pump body.

    2. Important: Replace the oil pump pressure relief valve spring when you reuse the oil pump.

  2. Install the following items:
    3. 2.1. The oil pump pressure relief valve
    2.2. The oil pump pressure relief valve spring
    2.3. The oil pump pressure relief valve spring straight pin

    Object Number: 5278 Size: SH
  3. Apply clean engine oil to the oil pump drive gear, the oil pump driven gear, and the oil pump body internal surfaces.
  4. Install the oil pump drive gear and the oil pump driven gear into the oil pump body.
    5. 4.1. Align the matchmarks on the oil pump drive and driven gears.
    4.2. Install the smooth side of the oil pump drive and driven gears toward the oil pump cover.

    Object Number: 5277 Size: SH
  5. Install the oil pump cover.

    6. Object Number: 5276 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Install the oil pump cover bolts.

    7. Tighten
    Tighten the bolts to 12 N·m (106 lb in).

  7. Inspect the oil pump for smoothness of operation by turning the oil pump driveshaft by hand.

    8. Object Number: 5280 Size: SH
  8. Install the oil pump screen.
    9. 8.1. If removed, replace the oil pump screen. The oil pump screen must have a good press fit into the oil pump body.
    8.2. Mount the oil pump in a soft jawed vise.
    8.3. Apply pipe sealant to the end of the oil pump screen pipe.
    8.4. Use the J 21882 and a soft-faced hammer in order to tap the oil pump screen into the pump body. The oil pump screen must align parallel with the bottom of the oil pan when the oil pan is installed.

    Object Number: 5274 Size: SH

    Important: Install a NEW oil pump driveshaft retainer during assembly.

  9. Install the oil pump driveshaft and the NEW oil pump driveshaft retainer.