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Home >> Chevrolet >> 2005 >> Aveo Base, 4D Hatchback >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Automatic Transmission - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Repair Instructions >> Oil Pump Inspection

Oil Pump Inspection

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Measuring The Clearance Of Driven Gear Using A Feeler Gage
    GM1246009Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If the body clearance is greater than the maximum, replace the oil pump body sub-assembly.
  1. Push the driven gear to one side of the body. Using a feeler gage, measure the clearance.

    Specifications: 

    • The standard body clearance is 0.1-0.17 mm (0.0039-0.0067 in).
    • The maximum body clearance is 0.17 mm (0.0067 in).

    2. Fig 2: Measuring The Tip Clearance Between Driven Gear Teeth
    GM1246013Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If the tip clearance is greater than the maximum, replace the oil pump body sub-assembly.
  2. Measure the tip clearance between the driven gear teeth and drive gear teeth.

    Specifications: 

    • The standard tip clearance is 0.07-0.15 mm (0.0028-0.0059 in).
    • The maximum tip clearance is 0.15 mm (0.0059 in).

    3. Fig 3: Measuring The Side Clearance Of Both Gears Using A Steel Straight Edge & Feeler Gage
    GM1246014Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If the side clearance is greater than the maximum, replace the drive gear, driven gear, or pump body.
  3. Using a steel straight edge and feeler gage, measure the side clearance of both gears.

    Specifications: 

    • The standard side clearance is 0.02-0.05 mm (0.0008-0.002 in).
    • The maximum side clearance is 0.05 mm (0.002 in).

    4. Fig 4: Measuring The Inside Diameter Of Oil Pump Body Bushing Using A Dial Indicator
    GM1246016Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If the inside diameter is greater than the maximum, replace the oil pump body sub-assembly.
  4. Using a dial indicator, measure the inside diameter of the oil pump body bushing.

    Specifications: 

    • The standard inside diameter is 38.126 mm (1.50102 in).
    • The maximum inside diameter is 38.188 mm (1.50346 in).

    5. Fig 5: Measuring The Inside Diameter Of Stator Shaft Bushings Using A Dial Indicator
    GM1246015Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If the inside diameter is greater than the maximum, replace the stator shaft.
  5. Using a dial indicator, measure the inside diameter of the stator shaft bushings.

    Specifications: 

    • The standard inside diameter is 18.437 mm (0.72586 in).
    • The maximum inside diameter is 18.5 mm (0.728 in).

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