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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1444 (Engine Mechanical - 5.3L (Lm4)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Oil Pan Cleaning and Inspection

Oil Pan Cleaning and Inspection

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Oil Transfer Tube, Bolts & Gaskets
    GM1215984Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: When installing a NEW oil pan gasket, it is not necessary to install the rivets that retain the NEW gasket to the pan.
  1. Remove the oil transfer tube bolts (435, 446) and gaskets (445, 448).
  2. Remove the oil transfer tube (447).
  3. Inspect the tube for damage or restrictions.
    4. Fig 2: View Of Oil Gallery Plugs
    GM1215985Courtesy of GENERAL MOTORS CORP.
  4. Remove the plugs from the oil galleries.
    5. Fig 3: View Of Oil Baffle & Bolts
    GM825846Courtesy of GENERAL MOTORS CORP.
  5. Remove the oil pan baffle and bolts.
    6. Fig 4: View Of Oil Pan Drain Plug
    GM825832Courtesy of GENERAL MOTORS CORP.
  6. Remove the oil pan drain plug and O-ring seal.
  7. Clean the oil pan in solvent. Be sure to thoroughly clean all of the oil passages and recesses of the pan.
  8. Clean the oil pan gasket surfaces. Refer to Replacing Engine Gaskets  .
    9. CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  9. Dry the oil pan with compressed air.
  10. Inspect the gasket sealing surfaces for excessive scratches or gouging. Refer to Replacing Engine Gaskets  .
  11. Inspect the oil pan drain plug and threaded drain hole for damaged threads.

    The drain plug O-ring seal may be used again, if not cut or damaged.

    12. Fig 5: View Of Oil Filter Fitting & Bypass Valve
    GM1272831Courtesy of GENERAL MOTORS CORP.
  12. Inspect the oil filter sealing surface for scratches or gouging.
  13. Inspect the oil filter fitting (438) for a loose fit or damaged threads.
  14. Inspect the oil passages for restrictions.
  15. Inspect the oil filter bypass valve (436) for proper operation.

    Lightly depress the bypass valve. The valve spring should seat the valve to the proper position.

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