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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1618 (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 2003 GMC Sierra and 2003 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.
    Fig 1: Apply Bead Of Adhesive To Right & Left Sides Of Front Cover To Engine Block
    G02105997Courtesy 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 both the right and left sides of the rear oil seal housing to engine block junction at the oil pan sealing surfaces.
    Fig 2: Apply Bead Of Adhesive To Right & Left Sides Of Rear Cover To Engine Block
    G02105998Courtesy 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.
    Fig 3: Oil Pan Gasket
    G02105999Courtesy 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.
    Fig 4: Oil Pan
    G02106000Courtesy 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.

    Fig 5: Measurements For Oil Pan Bolts & Nuts Installation
    G02106001Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  8. Tighten the oil pan bolts and nuts in the sequence shown.

    Tighten 

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

  9. Measure the clearance at the oil pan-to-transmission housing measurement points in order to ensure proper alignment.
    Fig 6: Tightening Sequence For Oil Pan Bolts & Nuts
    G02106002Courtesy of GENERAL MOTORS CORP.
  10. Install a NEW drain plug O-ring seal onto the drain plug.
  11. Install the drain plug.

    Tighten 

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

    Fig 7: Drain Plug
    G02106003Courtesy of GENERAL MOTORS CORP.
    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).

    Fig 8: Oil Level Sensor
    G02106004Courtesy of GENERAL MOTORS CORP.
  13. Install the transmission cover.

    Tighten 

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

    Fig 9: Transmission Cover
    G02106005Courtesy of GENERAL MOTORS CORP.
  14. Install the automatic transmission bolts, if equipped.
    Fig 10: Automatic Transmission Bolts
    G02106006Courtesy of GENERAL MOTORS CORP.
  15. Install the manual transmission bolts, if equipped.

    Tighten 

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

    Fig 11: Manual Transmission Bolts
    G02106007Courtesy of GENERAL MOTORS CORP.
  16. Install the positive battery cable clip bolt (2).

    Tighten 

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

    Fig 12: Positive Battery Cable Clip Bolt
    G02106008Courtesy of GENERAL MOTORS CORP.
  17. Install the starter. Refer to STARTER MOTOR .
  18. Connect the oil level sensor electrical connector (7).
    Fig 13: Oil Level Sensor Electrical Connector
    G02106009Courtesy of GENERAL MOTORS CORP.
  19. Install the battery cable bracket bolts.

    Tighten 

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

    Fig 14: Battery Cable Bracket Bolts
    G02106010Courtesy 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).

    Fig 15: Crossmember & Bolts
    G02106011Courtesy of GENERAL MOTORS CORP.
  21. Install the front differential carrier, if equipped with 4WD. Refer to DIFFERENTIAL CARRIER ASSEMBLY REPLACEMENT .
  22. If equipped with 4WD, install the crossmember and bolts.

    Tighten 

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

    Fig 16: Crossmember & Bolts (4WD)
    G02106012Courtesy 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).

    Fig 17: Oil Pan Skid Plate & Bolts
    G02106013Courtesy 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. Lower the vehicle.
  27. Fill the engine with the proper capacity and quality of engine oil.
    Fig 18: Oil Filter
    G02106014Courtesy of GENERAL MOTORS CORP.
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