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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Mechanical - 5.3L (L83) Or 6.2L (L86) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Engine Replacement >> Removal Procedure

Removal Procedure

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  1. Place the hood in the service position. Refer to Hood Service Positioning .
    2. Fig 1: Radiator Inlet Hose
    GM3247902Courtesy of GENERAL MOTORS COMPANY
  2. Remove the radiator inlet hose (2). Refer to Radiator Inlet Hose Replacement (L83 L86) .
    3. Fig 2: Radiator Outlet Hose Retainers
    GM3256183Courtesy of GENERAL MOTORS COMPANY
  3. Remove the radiator outlet hose (3). Refer to Radiator Outlet Hose Replacement (L83 L86) .
  4. Drain the engine oil. Engine Oil and Oil Filter Replacement 
    5. Fig 3: Radiator
    GM3258223Courtesy of GENERAL MOTORS COMPANY
  5. Remove the radiator. Refer to Radiator Replacement (L83 L86) .
    6. Fig 4: Air Conditioning Condenser
    GM3263637Courtesy of GENERAL MOTORS COMPANY
  6. Remove the air conditioning condenser. Refer to Air Conditioning Condenser Replacement (L83 L86) .
  7. Remove the headlamp and radiator grille mount panel. Refer to Headlamp and Radiator Grille Mount Panel Replacement .
    8. Fig 5: Heater Inlet Hose
    GM3228564Courtesy of GENERAL MOTORS COMPANY
  8. Remove the heater inlet hose (1). Refer to Heater Inlet Hose Replacement (L83 L86) .
  9. Remove the heater outlet hose. Refer to Heater Outlet Hose Replacement (L83 L86) .
    10. Fig 6: Generator Bracket
    GM3276603Courtesy of GENERAL MOTORS COMPANY
  10. Remove the generator bracket (6) from the engine assembly. Refer to Generator Bracket Replacement (L83, L86) .
    11. Fig 7: Fuel Injection Fuel Rail Assembly - Bank 1
    GM3266172Courtesy of GENERAL MOTORS COMPANY
  11. Remove the fuel injection fuel rail assembly - bank 1 (2). Refer to Fuel Injection Fuel Rail Assembly Replacement - Bank 1 .
    12. Fig 8: Front Engine Lift Bracket
    GM3283220Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure using a correct length bolt to keep the engine lift bracket firmly against the cylinder head.

  12. Install the front engine lift bracket (1) to the position shown.
    13. Fig 9: Rear Engine Lift Bracket
    GM3283238Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure using a correct length bolt to keep the engine lift bracket firmly against the cylinder head.

  13. Install the rear engine lift bracket (1) to the position shown.
    14. Fig 10: Engine Control Module
    GM3267086Courtesy of GENERAL MOTORS COMPANY
  14. Remove the engine control module (1). Refer to Engine Control Module Replacement .
  15. Disconnect the lever lock connector at the underhood electrical center and disconnect the harness retainers.
  16. If equipped with 4WD, disconnect the front differential vent hose from the wiring harness.
    17. Fig 11: View Of Underhood Electrical Center/Junction Block
    GM1827690Courtesy of GENERAL MOTORS COMPANY
  17. Disconnect the engine main wiring harness from the engine wiring harness junction block (1). Refer to Underhood Electrical Center or Junction Block Replacement .
  18. Remove the main engine harness retainer bolt and disconnect the main engine wire harness from the left side of the engine coolant manifold and water inlet housing.
  19. Disconnect the wiring harness at the left shock tower as necessary.
  20. Position the engine main wiring harness on to the engine assembly.
  21. Disconnect the generator cable retainer at the bracket on the right front cylinder head.
  22. Disconnect the air conditioning pressure sensor electrical connector and position aside. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (L83 L86) .
  23. Disconnect the MAF sensor harness retainers at the bulkhead and right side battery box panel.
  24. Disconnect the battery current sensor electrical connector. Refer to Battery Current Sensor Replacement (L83, L86) .
  25. Position and secure the oil cooler hoses to the engine.
  26. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  27. If the vehicle is equipped with a transfer case, remove the front propeller shaft. Refer to Front Axle Propeller Shaft Replacement (NQH)Front Axle Propeller Shaft Replacement (Heavy Duty) .
    28. Fig 12: View Of Left Flywheel Inspection Cover
    GM1708215Courtesy of GENERAL MOTORS COMPANY
  28. Remove the left flywheel inspection cover.
  29. Remove the starter motor. Refer to Starter Replacement (L83, L86) .
    30. Fig 13: View Of Right Flywheel Inspection Cover
    GM1705430Courtesy of GENERAL MOTORS COMPANY
  30. Remove the right flywheel inspection cover.
  31. Support the transmission with a transmission jack.
    32. Fig 14: View Of Transmission Crossmember, Crossmember Bolts & Nuts
    GM1702714Courtesy of GENERAL MOTORS COMPANY
  32. Remove the transmission crossmember (4). Refer to Transmission Support Crossmember Replacement (2 WD)Transmission Support Crossmember Replacement (4 WD) .
    33. Fig 15: Exhaust Front Pipe
    GM3254773Courtesy of GENERAL MOTORS COMPANY
  33. Remove the exhaust front pipe (2). Refer to Three-Way Catalytic Converter Replacement .
    34. Fig 16: View Of Flywheel To Torque Converter Bolts
    GM1708265Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Note the position and direction of the automatic transmission flex plate before removal.

  34. Remove the 3 flex plate to torque converter bolts.
  35. Disconnect the bank oxygen sensor wire harness retainers at the frame and bulkhead and position the harness to the engine.
  36. Lower the transmission to gain access to the top and sides of the transmission.
  37. If equipped with four wheel drive, disconnect the wire harness electrical connectors and harness retainers at the transfer case.
    38. Fig 17: View Of Transmission Heat Shield & Bolts
    GM1708338Courtesy of GENERAL MOTORS COMPANY
  38. Remove the transmission heat shield bolts and heat shield at the right side of the transmission.
    39. Fig 18: View Of Transmission Vent Hose
    GM1705102Courtesy of GENERAL MOTORS COMPANY
  39. Remove the transmission wire harness retainer bolt at the right side of the transmission.
  40. Disconnect the electrical connectors from the transmission assembly, then position the wiring harness on the engine assembly.
  41. Lower the vehicle.
  42. Disconnect the transmission wire harness retainers on the back side of the engine.
  43. Disconnect the bank 2 fuel rail electrical connector from the engine harness.
  44. If equipped, position the transfer case wiring harness on the engine.
  45. Position the bank 2 oxygen sensor wiring harness on the engine.
  46. Remove the ground cable bolt at the right side of the engine and position the cable out of the way.
    47. Fig 19: Transmission Fluid Filler Seal And Tube
    GM2654274Courtesy of GENERAL MOTORS COMPANY
  47. Remove the transmission dip stick tube retaining nut (1).
  48. Reposition the transmission dip stick tube (2).
    49. Fig 20: Wire Harness/Vent Tube Bracket Nut & Converter Housing Stud
    GM702529Courtesy of GENERAL MOTORS COMPANY
  49. Remove the vent tube bracket retaining nut from the back side of the engine.
    50. Fig 21: Fuel Line Bracket And Nut
    GM702523Courtesy of GENERAL MOTORS COMPANY
  50. Remove the fuel line bracket bolt at the back of the engine.
    51. Fig 22: Identifying Fuel Line And Bracket
    GM702521Courtesy of GENERAL MOTORS COMPANY
  51. Remove the fuel line bracket retainers (1) at the left side of the transmission and reposition the fuel lines.
    52. Fig 23: View Of Transmission Bolts
    GM1708536Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Leave the two lower transmission bolts in place.

  52. Remove the 6 upper bolts securing the transmission to the engine.
  53. Raise the transmission to the original installation position.
    54. Fig 24: View Of Transmission Crossmember, Crossmember Bolts & Nuts
    GM1702714Courtesy of GENERAL MOTORS COMPANY
  54. Temporary install the transmission crossmember (4) to support the transmission.
  55. Remove the jack supporting the transmission.
  56. Remove the two lower transmission to engine retaining bolts.
  57. Lower the vehicle.
    58. Fig 25: Right Upper Engine Mount Bolts
    GM3230757Courtesy of GENERAL MOTORS COMPANY
  58. Remove the right upper engine mount bolts (1). Refer to Engine Mount Replacement - Right Side .
    59. Fig 26: Left Upper Engine Mount Bolts
    GM3232316Courtesy of GENERAL MOTORS COMPANY
  59. Remove the left upper engine mount bolts (1). Refer to Engine Mount Replacement - Left Side .
    60. Fig 27: Transmission Fluid Cooler Inlet And Outlet Pipe
    GM3266332Courtesy of GENERAL MOTORS COMPANY
  60. Remove the transmission fluid cooler inlet and outlet pipe (1) from the transmission fluid cooler pipe clip (2).
    61. Fig 28: Power Brake Booster Vacuum Sensor And Pipe Assembly
    GM3269840Courtesy of GENERAL MOTORS COMPANY
  61. Disconnect the vacuum line and the vacuum sensor electrical connector (1) from the vacuum booster.
  62. If equipped, disconnect the engine block heater harness retainers and position the harness on the engine.
  63. Remove the nut holding the engine ground strap to the bulk head on the left side.
  64. Position a floor jack with a block of wood under the transmission.
  65. Install a suitable chain as tight as possible to the two engine lift brackets.
  66. Using a suitable engine lifting device, remove the engine from the vehicle.
  67. Install the J-21366  strap onto the transmission bell housing to retain the torque converter.
  68. Transfer components as necessary.
  69. Drain the engine oil.
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