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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 11 (ENGINE MECHANICAL - 4.3L UNIT REPAIR)REPAIR INSTRUCTIONSOIL PUMP ASSEMBLE
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Oil Pump Assemble

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Oil Pump Assemble
WARNING: This page is about a different variant/trim than selected.

Tools Required 

J 21882  Oil Suction Pipe Installer

  1. Apply clean engine oil GM P/N United States 12345610, GM P/N Canada 993193, or equivalent, to the oil pump pressure relief valve, oil pump pressure relief valve spring, and oil pump body.

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

  2. Install the following items:
    1. 2.1. The oil pump pressure relief valve
    2. 2.2. The oil pump pressure relief valve spring
    3. 2.3. The oil pump pressure relief valve spring straight pin
      Fig 1: Oil Pump Pressure Relief Valve & Spring
      G02502951Courtesy of GENERAL MOTORS CORP.
  3. Apply clean engine oil GM P/N United States 12345610, GM P/N Canada 993193, or equivalent, 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.
    1. 4.1. Align the matchmarks on the oil pump drive and driven gears.
    2. 4.2. Install the smooth side of the oil pump drive and driven gears toward the oil pump cover.
      Fig 2: Oil Pump Drive Gear & Driven Gear
      G02502952Courtesy of GENERAL MOTORS CORP.
  5. Install the oil pump cover.
    Fig 3: Oil Pump Cover
    G02502953Courtesy of GENERAL MOTORS CORP.
  6. Install the oil pump cover bolts. 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. Install the oil pump screen.
    1. 8.1. If removed, replace the oil pump screen. The oil pump screen must have a good press fit into the oil pump body.
    2. 8.2. Mount the oil pump in a soft jawed vise.
    3. 8.3. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent, to the end of the oil pump screen pipe.
    4. 8.4. Use the J 21882 and a soft-faced hammer in order to tap the oil pump screen into the pump body.
      Fig 4: Oil Pump Screen
      G02502955Courtesy of GENERAL MOTORS CORP.

    The oil pump screen must align parallel with the bottom of the oil pan when the oil pan is installed.

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

  9. Install the oil pump driveshaft and the NEW oil pump driveshaft retainer.
    Fig 5: Oil Pump Driveshaft
    G02502956Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.