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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Oil Pan Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Applying Adhesive To Engine Sides Front Cover To Engine Block Junction
    GM317310Courtesy 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.
  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 engine front cover to engine block junction at the oil pan sealing surfaces.
    2. Fig 2: Adhesive At Right & Left Sides Of Crankshaft Rear Oil Seal Housing
    GM317313Courtesy 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 crankshaft rear oil seal housing to engine block junction at the oil pan sealing surfaces.
    3. Fig 3: View Of Oil Pan Gasket
    GM387757Courtesy 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.
    4. Fig 4: Oil Pan
    GM330568Courtesy 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.
    6. Fig 5: Installing Oil Pan Bolts & Nuts
    GM38496Courtesy 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.

    8. Fig 6: Oil Pan Bolts & Nuts Proper Tightening Sequence
    GM38481Courtesy of GENERAL MOTORS CORP.
    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.
    10. Fig 7: Identifying Oil Drain Plug
    GM188048Courtesy 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).

    12. Fig 8: Oil Level Sensor
    GM387460Courtesy 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).

    13. Fig 9: Identifying Transmission To Oil Pan Bolts
    GM477866Courtesy of GENERAL MOTORS CORP.
  13. Install the transmission to oil pan bolts.

    Tighten:  Tighten the bolts to 47 N.m (35 lb ft).

    14. Fig 10: View Of Transmission Cover
    GM334324Courtesy of GENERAL MOTORS CORP.
  14. Install the transmission cover.

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

    15. Fig 11: Expanded View Of Oil Pan Rear Nuts Access Plugs
    GM331034Courtesy of GENERAL MOTORS CORP.
  15. Install the access plugs for the oil pan rear nuts.
  16. Install the starter motor. Refer to Starter Motor Replacement (4.8L, 5.3L, and 6.0L) or Starter Motor Replacement (4.3L) in Engine Electrical.
    17. Fig 12: Identifying Starter Wiring Harness & Transmission Cooler Pipes Bracket Retaining Bolt
    GM535378Courtesy of GENERAL MOTORS CORP.
  17. Install the bolt holding the bracket for the starter wiring harness and the transmission cooler pipes.

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

  18. Install the CKP sensor wiring harness in the retainer.
  19. Install the oil filter adapter. Refer to Oil Filter Adapter Replacement .
  20. Install the oil filter and the oil pan drain plug. Refer to Engine Oil and Oil Filter Replacement .
  21. If equipped with AWD, install the front differential carrier. Refer to Differential Carrier Assembly Replacement in Front Drive Axle.
  22. Lower the vehicle.
  23. Fill the crankcase with engine oil. Refer to Engine Oil and Oil Filter Replacement .
  24. Connect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
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