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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1444 (Engine Mechanical - 5.3L (Lm4)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Oil Pan Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the transmission bellhousing. 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 must NEVER protrude beyond the engine block and transmission bellhousing plane.
  • If replacing 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 protrudes 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 protrudes into the oil pan surface.
    3. Fig 3: View Of Oil Pan & Bolts
    GM898133Courtesy of GENERAL MOTORS CORP.
  3. Pre-assemble the oil pan gasket and bolts to the pan.
    • Install the gasket onto the pan.
    • Install the oil pan bolts to the pan and through the gasket.
  4. Install the oil pan, oil pan gasket, and bolts to the engine block as an assembly.
  5. Hand thread the oil pan bolts into the engine block until snug. Do not tighten at this time.
    6. Fig 4: View Of Lower Bellhousing Bolts
    GM899342Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  6. Install the 2 lower bellhousing bolts.

    Tighten: 

    1. Tighten the lower bellhousing bolts to 50 N.m (37 lb ft).
    2. Tighten the 2 rear oil pan to rear cover bolts to 12 N.m (106 lb in).
    3. Tighten the remaining oil pan bolts to 25 N.m (18 lb ft).

    7. Fig 5: View Of A/C Compressor Bracket Bolts
    GM871561Courtesy of GENERAL MOTORS CORP.
  7. Install the 2 lower A/C compressor bracket bolts (3).

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

  8. Tighten the 2 upper A/C compressor bracket bolts (4).

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

    9. Fig 6: View Of Battery Cable Channel & Bolt
    GM899616Courtesy of GENERAL MOTORS CORP.
  9. Install the battery cable channel to the oil pan.
  10. Install the battery cable channel bolt to the oil pan.

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

  11. Install the Flywheel inspection cover to the left side of the transmission.
    12. Fig 7: View Of Transmission Oil Cooler Line Retaining Bracket & Bolt
    GM901495Courtesy of GENERAL MOTORS CORP.
  12. Install the starter. Refer to Starter Motor Replacement (5.3L Engine) in Engine Electrical.
  13. If equipped with 4WD, install the inner axle shaft. Refer to Inner Axle Shaft Replacement - Front Drive Axle in Front Drive Axle.
  14. If equipped with 2WD, install the steering gear. See INSTALLATION PROCEDURE .
  15. Install the transmission oil cooler line retaining bracket and bolt.

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

    16. Fig 8: View Of Transmission Oil Cooler Lines
    GM871551Courtesy of GENERAL MOTORS CORP.
  16. Install the transmission oil cooler lines to the retainer.
  17. Install the oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement  .
  18. Fill the engine with oil. Refer to Engine Oil and Oil Filter Replacement  .
    19. Fig 9: Securing Front Differential To Frame
    GM893104Courtesy of GENERAL MOTORS CORP.
  19. Install the front differential. Refer to Differential Carrier Assembly Replacement (4.8L, 5.3L, 6.0L V-8) in Front Drive Axle.
  20. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
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