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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1018 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Oil Pan Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Any time the transmission and the engine oil pan are off of the engine at the same time, install the transmission before the oil pan. This is to allow for the proper oil pan alignment. Failure to achieve the correct oil pan alignment can result in transmission failure.
  1. Apply a 5 mm (0.197 in) wide and 25 mm (1.0 in) long bead of adhesive GM P/N 12346141, (Canadian P/N 10953433), or equivalent to both the right and left sides of the front cover to engine block junction at the oil pan sealing surfaces.
    2. Fig 1: Applying Adhesive To Sides Of Front Cover To Engine Block Junction At Oil Pan Sealing Surfaces
    GM869738Courtesy of GENERAL MOTORS CORP.
  2. Apply a 5 mm (0.197 in) wide and 25 mm (1.0 in) long bead of adhesive GM P/N 12346141, (Canadian P/N 10953433), or equivalent to the entire length of rear oil seal housing to engine block junction at the oil pan sealing surfaces.
    3. Fig 2: Applying Adhesive To Entire Length Of Rear Oil Seal Housing To Engine Block Junction At Oil Pan Sealing Surfaces
    GM1563933Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Always install a NEW oil pan gasket.
    The oil pan gasket and oil pan must be installed and the fasteners tightened while the adhesive is still wet to the touch.
  3. Install a NEW oil pan gasket into the groove in the oil pan.
    4. Fig 3: View Of Oil Pan Gasket
    GM387757Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The oil pan alignment must always be flush or forward no more than 0.3 mm (0.011 in) from the rear face of the engine block.
  4. Install the oil pan.

    Press the oil pan gasket into the grooves of the engine front cover and crankshaft rear oil seal housing.

  5. Slide the oil pan back against a suitable straight edge.
    6. Fig 4: Positioning Oil Pan
    GM869737Courtesy of GENERAL MOTORS CORP.
  6. Install the oil pan bolts and nuts until snug.
  7. Measure the oil pan-to-transmission housing clearance using a feeler gage and a straight edge.

    Use the feeler gage to check the clearance at the oil pan-to-transmission housing measurement points (1). If the clearance exceeds 0.3 mm (0.011 in) at any of the oil pan-to-transmission housing measurement points (1), then repeat the step until the oil pan-to-transmission housing clearance is within specifications. The oil pan must always be forward of the rear face of the engine block.

    8. Fig 5: Installing Oil Pan
    GM869752Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Tighten the oil pan bolts and nuts in the sequence shown.

    Tighten:  Tighten the bolts to 25 N.m (18 lb ft).

    9. Fig 6: Oil Pan Bolts & Nuts Proper Tightening Sequence
    GM38481Courtesy of GENERAL MOTORS CORP.
  9. Measure the clearance at the oil pan-to-transmission housing measurement points in order to ensure proper alignment.
  10. Install a NEW drain plug O-ring seal onto the drain plug.
    11. Fig 7: Identifying Oil Drain Plug
    GM188048Courtesy of GENERAL MOTORS CORP.
  11. Install the drain plug.

    Tighten:  Tighten the plug to 25 N.m (18 lb ft).

    12. IMPORTANT: The oil level sensor is not reusable. Use a NEW oil sensor.
  12. Install a NEW oil level sensor.

    Tighten:  Tighten the sensor to 13 N.m (115 lb in).

    13. Fig 8: Installing Oil Level Sensor
    GM387460Courtesy of GENERAL MOTORS CORP.
  13. Install the transmission cover.

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

    14. Fig 9: Installing Transmission Cover
    GM869725Courtesy of GENERAL MOTORS CORP.
  14. Install the automatic transmission bolts, if equipped.
    15. Fig 10: Installing Automatic Transmission Bolts
    GM869723Courtesy of GENERAL MOTORS CORP.
  15. Install the manual transmission bolts, if equipped.

    Tighten:  Tighten the bolts to 50 N.m (37 lb ft).

    16. Fig 11: Installing Manual Transmission Bolts
    GM869725Courtesy of GENERAL MOTORS CORP.
  16. Install the positive battery cable clip bolt (2).

    Tighten:  Tighten the bolt to 9 N.m (80 lb in).

    17. Fig 12: Installing Positive Battery Cable Clip Bolt
    GM869722Courtesy of GENERAL MOTORS CORP.
  17. Install the starter. Refer to Starter Motor Replacement (4.3L Engine) in Engine Electrical.
  18. Connect the oil level sensor electrical connector (7).
    19. Fig 13: View Of Oil Level Sensor Electrical Connector, CKP Electrical Connector & Battery Ground Bolt
    GM782731Courtesy of GENERAL MOTORS CORP.
  19. Install the battery cable bracket bolts.

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

    20. Fig 14: Installing Battery Cable Bracket Bolts
    GM310250Courtesy of GENERAL MOTORS CORP.
  20. If equipped with 2WD, Install the crossmember and bolts.

    Tighten:  Tighten the bolts to 100 N.m (74 lb ft).

    21. Fig 15: View Of Crossbar Bolts & Bar (2WD)
    GM328107Courtesy of GENERAL MOTORS CORP.
  21. Install the front differential carrier, if equipped with 4WD. Refer to Differential Carrier Assembly Replacement in Front Drive Axle.
  22. If equipped with 4WD, install the crossmember and bolts.

    Tighten:  Tighten the bolts to 100 N.m (74 lb ft).

    23. Fig 16: View Of Crossmember Bolts & Bar (4WD Only)
    GM487521Courtesy of GENERAL MOTORS CORP.
  23. If equipped, install the oil pan skid plate and bolts.

    Tighten:  Tighten the bolts to 20 N.m (15 lb ft).

    24. Fig 17: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  24. Lubricate the oil filter gasket with clean engine oil.
  25. Install the oil filter.

    Tighten:  Tighten the filter to 30 N.m (22 lb ft).

    26. Fig 18: Installing Oil Filter
    GM316766Courtesy of GENERAL MOTORS CORP.
  26. Lower the vehicle.
  27. Fill the engine with the proper capacity and quality of engine oil. Refer to Capacities - Approximate Fluid in Maintenance and Lubrication.
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