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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 418 (Engine Mechanical - 4.2L 6-Cylinder (On-Vehicle)) >> Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the hood. Refer to Hood Replacement in Body Front End.
  2. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Electrical.
  3. Drain engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
  4. Recover the refrigerant. Refer to RECOVERY/EVACUATION & RECHARGING in Heating, Ventilation and Air Conditioning.
  5. Remove the oil pan drain plug and drain the oil.
    IMPORTANT: Keep drain plug removed during engine removal and installation.
    6. Fig 1: Removing Oil Pan Drain Plug
    G01706361Courtesy of GENERAL MOTORS CORP.
  6. Install a suitable plug into the oil pan after draining to prevent any oil leakage during the rest of the procedure.
  7. Remove the air cleaner assembly.
  8. Remove the throttle body. Refer to THROTTLE BODY in Engine Controls - 4.2 L
  9. Remove the map sensor. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR in Engine Controls - 4.2L
  10. Remove the washer solvent container. Refer to WASHER SOLVENT CONTAINER REPLACEMENT in Wipers/Washer Systems.
  11. Remove the air intake baffle. Refer to Air Intake Baffle Replacement - Radiator in Body Front End.
  12. Remove the grill. Refer to Grille Replacement (GMC) or Grille Replacement (Chevrolet) or Grille Replacement (Oldsmobile) in Body Exterior.
  13. Remove the headlamp housing. Refer to Headlamp Housing Panel Replacement (Chevy, GMC) or Headlamp Housing Panel Replacement (Olds) in Body Front End.
  14. Remove the radiator support brace. Refer to Brace Replacement - Radiator Support Diagonal in Body Front End.
  15. Remove the hood latch. Refer to Hood Latch Support Replacement in Body Front End.
  16. Disconnect A/C lines at the condenser.
  17. Disconnect the transmission cooler lines at the engine, not the radiator.
  18. Remove the cooling fan and the shroud tilting the radiator forward, and the cooling fan and the shroud rearward for clearance. Refer to Cooling Fan and Shroud Replacement in Engine Cooling.
  19. Remove the radiator with condenser and transmission cooler lines. Refer to Radiator Replacement in Engine Cooling.
  20. Remove the drive belt. Refer to Drive Belt Replacement .
  21. Remove the power steering pump bolts and lay the pump aside.
  22. Ensure the heater hoses at the heater core are disconnected.
    23. Fig 2: Ensuring Heater Hoses At Heater Core Are Disconnected
    G01706362Courtesy of GENERAL MOTORS CORP.
  23. Disconnect the transmission filler tube bracket nut from the AIR adapter.
    24. Fig 3: Disconnecting Transmission Filler Tube Bracket Nut From AIR Adapter
    G01706363Courtesy of GENERAL MOTORS CORP.
  24. Remove the AIR adapter.
    25. Fig 4: Removing AIR Adapter
    G01706364Courtesy of GENERAL MOTORS CORP.
  25. Install the lift hook J 44220 to the AIR adapter.
    26. Fig 5: Installing Lift Hook To AIR Adapter
    G01706365Courtesy of GENERAL MOTORS CORP.
  26. Disconnect the oxygen sensor electrical connector.
  27. Disconnect the A/C line at the accumulator.
  28. Disconnect the front axle actuator electrical connector.
  29. Disconnect the camshaft phaser actuator valve electrical connector.
  30. Unclip the transmission cooler lines from right side of the engine block.
    31. Fig 6: Unclipping Transmission Cooler Lines From Right Side Of Engine Block
    G01706366Courtesy of GENERAL MOTORS CORP.
  31. Disconnect the ignition coil harness connectors.
  32. Carefully disconnect harness retainer at clips (1) and remove.
    33. Fig 7: Disconnecting Harness Retainer At Clips
    G01706367Courtesy of GENERAL MOTORS CORP.
  33. Remove power brake hose at booster.
  34. Remove the PCM. Refer to POWERTRAIN CONTROL MODULE in Engine Controls - 4.2 L.
    35. Fig 8: Removing PCM
    G01706368Courtesy of GENERAL MOTORS CORP.
  35. Disconnect the full lines at the fuel pressure regulator and cap lines. Refer to FUEL PRESSURE REGULATOR in Engine Controls - 4.2 L.
  36. Remove all harnesses from the engine harness bracket.
  37. Disconnect the front differential vent hose from the engine harness bracket.
  38. Remove the engine harness bracket bolt and remove bracket.
    39. Fig 9: Removing Engine Harness Bracket
    G01706369Courtesy of GENERAL MOTORS CORP.
  39. Disconnect starter electrical connections (1).
    40. Fig 10: Disconnect Starter Electrical Connections
    G01706370Courtesy of GENERAL MOTORS CORP.
  40. Disconnect the A/C pressure sensor and clutch electrical connector.
  41. Disconnect generator electrical connector and battery lead.
    42. Fig 11: Disconnecting Generator Electrical Connector
    G01706371Courtesy of GENERAL MOTORS CORP.
  42. Disconnect the knock sensor electrical connector.
  43. Disconnect the crankshaft sensor electrical connector.
  44. Disconnect the camshaft sensor electrical connector.
  45. Remove 4 grounds on the left side of the block (1).
    46. Fig 12: Removing 4 Grounds On Left Side Of Block
    G01706372Courtesy of GENERAL MOTORS CORP.
  46. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  47. Remove the wheel drive shafts, left and right. Refer to FRONT DRIVE AXLE - 4WD article.
  48. Remove the propeller shaft from the front axle pinion yoke. Refer to PROPELLER SHAFT REPLACEMENT - FRONT in Propeller Shaft.
  49. Remove the engine protection shield. Refer to Engine Protection Shield Replacement in Body Front End.
  50. Disconnect the exhaust pipe from the exhaust manifold and slide the exhaust pipe backward slightly.
    51. Fig 13: Disconnecting Exhaust Pipe From Exhaust Manifold
    G01706373Courtesy of GENERAL MOTORS CORP.
  51. Remove the fuel tank shield, if equipped. Refer to Fuel Tank Shield Replacement in Frame and Underbody.
  52. Remove the torque converter bolt access cover.
  53. Remove the torque converter bolts.
  54. Place a jack on the transmission oil pan for support.
  55. Remove the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
  56. Lower the transmission enough to reach the top bell housing bolts.
  57. Remove the top 4 bell housing bolts, there may be 2 harness clips that will need to be removed in order to have access to 2 of the top bolts.
  58. Raise the transmission.
  59. Reinstall the transmission support using only 2 through bolts.
  60. Remove the remaining bell housing bolts, for a total of 11 bolts.
  61. Remove the left and right engine lower mount nuts.
  62. Disconnect the oil lever sensor electrical connector.
  63. Disconnect the oil pressure switch electrical connector.
  64. Lower the vehicle.
  65. Remove the left upper engine mount nut.
    66. Fig 14: Removing Left Upper Engine Mount Nut
    G01706374Courtesy of GENERAL MOTORS CORP.
  66. Remove the right upper engine mount nut.
    67. Fig 15: Removing Right Upper Engine Mount Nut
    G01706375Courtesy of GENERAL MOTORS CORP.
  67. Install the engine hoist.
  68. Raise the engine out of the compartment slowly keeping the transmission supported.
  69. Remove both engine mount for clearance.
  70. Continue raising the engine out of the vehicle.
  71. Install the engine to the engine stand.
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