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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 429 (Engine Mechanical - 1.8L (LNK)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Oil Pump Cleaning and Inspection

Oil Pump Cleaning and Inspection

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the following for the excessive wear or damage:
    • The oil pump outer gear
    • The oil pump inner gear
    • The oil pump cover
    • The oil pump body
  2. Measure the radial clearance between the oil pump outer gear and the oil pump body using a feeler gage.

    Replace the oil pump outer gear and/or oil pump if the clearance exceeds 0.325 mm (0.01280 in).

    Fig 1: Measuring Radial Clearance
    G01546565Courtesy of GENERAL MOTORS CORP.
  3. Measure the side clearance between the oil pump gears and a straightedge using a feeler gage.

    Replace the gears if the clearance exceeds 0.16 mm (0.0062 in).

    Fig 2: Measuring Side Clearance
    G01546566Courtesy of GENERAL MOTORS CORP.
  4. Measure the tip clearance between the oil pump gear tips using a feeler gage.

    Replace the gears if the clearance exceeds 0.35 mm (0.0138 in).

    Fig 3: Measuring Tip Clearance
    G01546567Courtesy of GENERAL MOTORS CORP.
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