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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 >> Engine Replacement >> Removal Procedure

Removal 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.
    Fig 1: Locating Components Connectors At Rear Of Engine
    GM898333Courtesy of GENERAL MOTORS CORP.
  1. Remove the hood. Refer to Hood Replacement in Body Front End.
  2. Place fender covers over both fenders.
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  4. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging in Heating, Ventilation, and Air Conditioning.
  5. Remove the radiator. Refer to Radiator Replacement (LM4) in Engine Cooling.
  6. Remove the radiator support brace. Refer to Brace Replacement - Radiator Support Diagonal in Body Front End.
  7. Remove the front differential drive axle, if equipped with 4-wheel drive (4WD). Refer to Differential Carrier Assembly Replacement (4.8L, 5.3L, 6.0L V-8) in Front Drive Axle.
  8. Remove the wheel drive shafts. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
  9. Remove the intake manifold. Refer to Intake Manifold Replacement  .
  10. Disconnect the following electrical connectors:
    • Oil pressure sensor (1)
    • Oxygen sensors (2, 3)
    • Camshaft position (CMP) sensor (4)
    11. Fig 2: View Of Rear A/C Lines
    GM871567Courtesy of GENERAL MOTORS CORP.
  11. Remove the air conditioning (A/C) compressor hose. Refer to Compressor Hose Assembly Replacement (LM4) in Heating, Ventilation, and Air Conditioning.
  12. Disconnect the rear auxiliary A/C compressor pipe fitting (7).
  13. Remove the rear auxiliary A/C compressor pipe nut and bolt (2, 5).
  14. Tie the pipe assembly out of the way.
    15. Fig 3: View Of ECT Sensor Electrical Connector And Ground
    GM898343Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the engine coolant temperature (ECT) sensor (1).
  16. Remove the ground terminal bolt (2).
  17. Remove the retaining clips from the brackets.
    18. Fig 4: View Of A/C Compressor Pressure Switch Electrical Connector & Retaining Clip
    GM898468Courtesy of GENERAL MOTORS CORP.
  18. Disconnect the A/C pressure switch electrical connector (2).
  19. Remove the retaining clip (1) from the cylinder head.
  20. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    21. Fig 5: View Of Ground Terminal Bolts
    GM898338Courtesy of GENERAL MOTORS CORP.
  21. Remove the ground terminal bolts (2, 4).
  22. Remove the starter. Refer to Starter Motor Replacement (5.3L Engine) in Engine Electrical.
    23. Fig 6: View Of Battery Cable Channel & Bolt
    GM899616Courtesy of GENERAL MOTORS CORP.
  23. Remove the battery cable channel bolt.
  24. Remove the battery cable channel from the oil pan.
    25. Fig 7: Disconnecting/Connecting A/C Compressor Electrical Connector
    GM898469Courtesy of GENERAL MOTORS CORP.
  25. Disconnect the A/C compressor electrical connector.
  26. Lower the vehicle.
  27. Gather all branches of the engine wiring harness and reposition the harness off to the side.
    28. Fig 8: View Of Generator Cable & Nut
    GM395686Courtesy of GENERAL MOTORS CORP.
  28. Remove the generator cable from the generator, perform the following:
    • Slide the boot down revealing the terminal stud.
    • Remove the generator cable nut from the terminal stud.
    • Remove the generator cable.
    29. Fig 9: View Of Generator Bracket & Bolts
    GM310813Courtesy of GENERAL MOTORS CORP.
  29. Remove the generator bracket bolts.
  30. Position the bracket with generator aside.
    31. Fig 10: View Of Inlet Hose
    GM901490Courtesy of GENERAL MOTORS CORP.
  31. Using J 38185  , reposition the inlet hose clamp. See Special Tools and Equipment .
  32. Remove the inlet hose from the water outlet.
    33. Fig 11: View Of Outlet Hose
    GM901491Courtesy of GENERAL MOTORS CORP.
  33. Using J 38185  , reposition the inlet hose clamp. See Special Tools and Equipment .
  34. Remove the outlet hose from the water outlet.
    35. Fig 12: Disconnecting/Connecting Auxiliary Heater Hose/Pipe Assembly
    GM901493Courtesy of GENERAL MOTORS CORP.
  35. Disconnect the auxiliary heater inlet and outlet hose/pipe assembly from the heater water shutoff valve pipes.
    36. Fig 13: View Of Auxiliary Heater Inlet & Outlet Hoses/Pipes
    GM901492Courtesy of GENERAL MOTORS CORP.
  36. Using J 38185  , reposition the auxiliary heater inlet and outlet hose clamps. See Special Tools and Equipment .
  37. Remove the auxiliary heater inlet and outlet hoses/pipes from the water pump.
    38. Fig 14: View Of J 41798
    GM309151Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  38. Remove the ignition coil(s) (as required) for the proper fit of the J 41798  before lifting the engine. See Special Tools and Equipment . Refer to Ignition Coil(s) Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L.
  39. Install the J 41798  to the cylinder heads. See Special Tools and Equipment .

    Tighten: 

    • Tighten the M8 bolts to 25 N.m (18 lb ft).
    • Tighten the M10 bolts to 50 N.m (37 lb ft).

  40. Raise the vehicle.
  41. Remove the catalytic converter. Refer to Catalytic Converter Replacement (5.3L Engine) in Engine Exhaust.
    42. Fig 15: View Of Frame Engine Mount Bracket Bolt Locations
    GM876704Courtesy of GENERAL MOTORS CORP.
  42. Remove the 3 frame engine mount bracket bolts from both the right and left sides.
    43. Fig 16: Flywheel-To-Torque Converter Bolts
    GM9096Courtesy of GENERAL MOTORS CORP.
  43. Remove the torque converter bolts.
    44. Fig 17: View Of Oil Level Indicator Tube Nut
    GM396797Courtesy of GENERAL MOTORS CORP.
  44. Remove the transmission oil level indicator tube nut.
    45. Fig 18: View Of Oil Level Indicator Tube & Seal
    GM396798Courtesy of GENERAL MOTORS CORP.
  45. Remove the transmission oil level indicator tube.
    46. Fig 19: View of Transmission Bolt & Stud
    GM859004Courtesy of GENERAL MOTORS CORP.
  46. Remove the transmission bolt and stud on the right side.
    47. Fig 20: View Of Automatic Transmission Bolt/Studs
    GM859003Courtesy of GENERAL MOTORS CORP.
  47. Remove the lower transmission bolt/studs.
  48. Lower the vehicle.
  49. Remove the 3 upper transmission bolts/studs.
  50. Install an engine hoist to the J 41798  . See Special Tools and Equipment .
  51. Install a floor jack under the transmission for support.
  52. Separate the engine from the transmission.
  53. Remove the engine.
  54. Install the engine to an engine stand.
  55. Install J 21366  to the transmission in order to hold the torque converter. See Special Tools and Equipment .
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