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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1537 (Engine Mechanical (Repair Instructions 1 Of 3) - 5.7L) >> Repair Instructions (On-Vehicle & Off-Vehicle - Part 1 >> On-Vehicle Repair Instructions >> Oil Pan Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: All gasket surfaces should be free of oil or other foreign material during assembly.

The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the flywheel housing cover. To ensure the rigidity of the powertrain and correct transmission alignment, it is important that the rear of the block and the rear of the oil pan are flush or even. The rear of the oil pan must NEVER protrude beyond the engine block.


Do NOT reuse the oil pan gasket.

It is not necessary to rivet the NEW gasket to the oil pan.

    Fig 1: View Of Sealant Applied To Front Oil Pan-To-Engine Block Junction
    GM451897Courtesy of GENERAL MOTORS CORP.
  1. Apply a 5 mm (0.20 in) bead of sealant GM P/N 12378190, or equivalent 20 mm (0.80 in) long to the engine block. Apply the sealant directly onto the tabs of the front cover gasket that protrude into the oil pan surface.
    2. Fig 2: View Of Sealant Applied To Rear Oil Pan-To-Engine Block Junction
    GM451898Courtesy of GENERAL MOTORS CORP.
  2. Apply a 5 mm (0.20 in) bead of sealant GM P/N 12378190, or equivalent 20 mm (0.80 in) long to the engine block. Apply the sealant directly onto the tabs of the rear cover gasket that protrude into the oil pan surface.
    3. Fig 3: Oil Pan Gasket & Engine Block
    GM702060Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Be sure to align the oil gallery passages in the oil pan and engine block properly with the oil pan gasket.
  3. Pre-assemble the oil pan gasket to the pan.
    1. Install the gasket onto the oil pan.
    2. Install the oil pan bolts to the pan and through the gasket.
    3. Install the oil pan, gasket and bolts to the engine block.
    4. Tighten the oil pan bolts until snug. Do not overtighten.
    4. Fig 4: Bottom Flywheel Housing-To-Oil Pan & Bolts
    GM651884Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Install the 2 bottom flywheel housing bolts to position the oil pan correctly.
  5. Tighten the 2 bottom flywheel housing bolts until snug. Do not overtighten.

    Tighten: 

    1. Tighten the oil pan bolt and oil pan-to-front cover bolts to 25 N.m (18 lb ft).
    2. Tighten the oil pan-to-rear cover bolts to 12 N.m (106 lb in).
    3. Tighten the flywheel housing bolts to 50 N.m (37 lb ft).

    6. Fig 5: Engine Oil Temperature Sensor Electrical Connector & Ground Straps
    GM651886Courtesy of GENERAL MOTORS CORP.
  6. Connect the engine oil temperature sensor (3) electrical connector.
    7. Fig 6: Engine Oil Level Sensor Electrical Connector & CKP Sensor Electrical Connector
    GM651885Courtesy of GENERAL MOTORS CORP.
  7. Connect the engine oil level sensor electrical connector (2).
    8. Fig 7: Right Transmission Cover & Bolt
    GM208464Courtesy of GENERAL MOTORS CORP.
  8. Install the right transmission cover and bolt.

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

    9. Fig 8: Automatic Transmission Fluid Cooler Line & Oil Pan
    GM651883Courtesy of GENERAL MOTORS CORP.
  9. Install the automatic transmission fluid cooler line clamp bolt-at-the oil pan, if equipped.

    Tighten:  Tighten the automatic transmission fluid cooler line clamp bolt-at-the oil pan to 12 N.m (106 lb in).

    10. Fig 9: Automatic Transmission Fluid Cooler Line Clamp & Bolt
    GM71418Courtesy of GENERAL MOTORS CORP.
  10. Install the automatic transmission fluid cooler line clamp bolt-at-right transmission cover, if equipped.

    Tighten:  Tighten the automatic transmission fluid cooler line bolt-at-right transmission cover to 2.5 N.m (22 lb in).

    11. Fig 10: Left Transmission Cover & Bolt
    GM208478Courtesy of GENERAL MOTORS CORP.
  11. Install the left transmission cover and bolt.

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

  12. Install the starter motor. Refer to Starter Motor Replacement in Engine Electrical.
    13. Fig 11: Lower Oil Pan, Gasket, Oil Pan & Bolts
    GM414785Courtesy of GENERAL MOTORS CORP.
  13. Install the oil pan (lower) (3) and gasket (2) to the oil pan (1).
  14. Install the oil pan bolts (4).
    15. Fig 12: Lower Oil Pan Bolt (1-15)
    GM414783Courtesy of GENERAL MOTORS CORP.
  15. Tighten the oil pan (lower) bolts (1-15) in a crossing pattern, alternating from side-to-side.

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

    16. Fig 13: Engine Oil Filter
    GM63221Courtesy of GENERAL MOTORS CORP.
  16. Install a NEW engine oil filter.

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

    17. Fig 14: Oil Pan Drain Plug
    GM74223Courtesy of GENERAL MOTORS CORP.
  17. Install the oil pan drain plug.

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

  18. Install the front suspension crossmember to the vehicle. Refer to Crossmember Replacement - Front Suspension in Front Suspension.
  19. Fill the crankcase with the proper quantity and grade of engine oil. Refer to Capacities - Approximate Fluid and Fluid and Lubricant Recommendations in Maintenance and Lubrication.
  20. Check the transmission fluid, add if necessary.
  21. Run the engine and check for leaks.
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