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

Installation Procedure

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 or equivalent to both the right and left sides of the engine front cover to engine block junction at the oil pan sealing surfaces.
    Fig 1: Applying Adhesive At Engine Front Cover To Engine Block Junction
    G01661267Courtesy 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 or equivalent to both the right and left sides of the crankshaft rear oil seal housing to engine block junction at the oil pan sealing surfaces.
    Fig 2: Applying Adhesive At Crankshaft Rear Oil Seal Housing To Engine Block Junction
    G01661268Courtesy 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 the NEW oil pan gasket into the groove in the oil pan
    Fig 3: Oil Pan Gasket
    G01661269Courtesy 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 onto the engine block.

    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
    G01661270Courtesy of GENERAL MOTORS CORP.
  6. Install the oil pan bolts and nuts, but do not tighten
  7. Measure the pan-to-transmission housing clearance using a feeler gage and a straight edge.

    Use a feeler gage to check the clearance between the oil pan-to-transmission housing measurement points. If the clearance exceeds 0.3 mm (0.011 in) at any of the 3 oil pan-to-transmission housing measurement points (1), then repeat the step until the oil pan-to-transmission housing clearance is within the specification The oil pan must always be forward of the rear face of the engine block.

    Fig 5: Measuring Pan-To-Transmission Housing Clearance
    G01661271Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  8. Tighten the oil pan bolts and nuts in sequence.

    Tighten 

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

  9. Measure the clearance between the 3 oil pan-to-transmission housing measurement points in order to ensure proper alignment.
    Fig 6: Oil Pan Bolts Tightening Sequence
    G01661272Courtesy of GENERAL MOTORS CORP.
  10. Install a NEW oil pan drain plug seal (O-ring) onto the oil pan drain plug.
  11. Install the oil pan drain plug into the oil pan.

    Tighten 

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

    Fig 7: Oil Pan Drain Plug
    G01661273Courtesy of GENERAL MOTORS CORP.

    Important:  The low oil level sensor is not reusable. Use a NEW low oil sensor.

  12. Install the NEW engine oil level sensor (if applicable).

    Tighten 

    Tighten the engine oil level sensor to 13 N.m (115 lb in).

    Fig 8: Engine Oil Level Sensor
    G01661274Courtesy of GENERAL MOTORS CORP.
    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.
  13. Install the transmission to oil pan bolts.

    Tighten 

    Tighten the transmission to the oil pan bolts to 47 N.m (35 lb ft).

    Fig 9: Transmission To Oil Pan Bolts
    G01661275Courtesy of GENERAL MOTORS CORP.
  14. Install the access plugs for the oil pan rear nuts.
    Fig 10: Access Plugs
    G01661276Courtesy of GENERAL MOTORS CORP.
  15. Install the stud holding the bracket for the starter wire harness and if equipped, the transmission oil cooler pipes.

    Tighten 

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

  16. Install the remote oil filter pipe adapter. Refer to Oil Filter Adapter Replacement .
    Fig 11: Transmission Oil Cooler Pipes, Starter Wire Harness Bracket & Stud
    G01661277Courtesy of GENERAL MOTORS CORP.
  17. Install the bolt holding the oil filter inlet and outlet hose clip to the oil pan.

    Tighten 

    Tighten the hose clip bolt to 10 N.m (88 lb in).

    Fig 12: Oil Filter Inlet & Outlet Hose Clip Bolt
    G01661278Courtesy of GENERAL MOTORS CORP.
  18. Install the transmission cover and bolts.

    Tighten 

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

    19. Fig 13: Transmission Cover & Bolts
    G01661279Courtesy of GENERAL MOTORS CORP.
  19. Install the starter motor. Refer to STARTER MOTOR .
  20. Install the front differential assembly. Refer to DIFFERENTIAL CARRIER .
  21. Install the oil level indicator.
  22. Fill the engine with engine oil. Refer to Engine Oil and Oil Filter Replacement .
  23. Connect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .
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