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

Oil Pan Installation

  1. Apply a 5 mm (0.197 in) wide and 25 mm (1.0 in) long bead of adhesive GM P/N United States 12346141, GM P/N Canada 10953433, 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: Engine Front Cover-To-Engine Block Junction At Oil Pan Sealing Surfaces Adhesive Measurement
    G01660593Courtesy 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 United States 12346141, GM P/N Canada 10953433, 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: Crankshaft Rear Oil Seal Housing-To-Engine Block Junction At The Oil Pan Sealing Surfaces Adhesive Measurement
    G01660594Courtesy 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
    G01660595Courtesy 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
    G01660596Courtesy 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: Oil Pan Bolts & Nuts
    G01660597Courtesy of GENERAL MOTORS CORP.
    NOTE: The alignment of the mating components is crucial. An offset greater than 0.30 mm (0.011 in) between the rear faces of the oil pan and block is not acceptable. Offsets greater than 0.30 mm (0.011 in) will affect the alignment between the engine assembly and the transmission. Mis-alignment of the engine assembly to the transmission can lead to internal and external damage to the engine assembly and/or transmission.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  8. Tighten the oil pan bolts and nuts in sequence (1-12).

    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 Bolt Tightening Sequence
    G01660598Courtesy 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
    G01660599Courtesy of GENERAL MOTORS CORP.
  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
    G01660600Courtesy of GENERAL MOTORS CORP.
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