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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Mechanical - 4.3L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying Hood Hinge Normal And Service Position Bolt Holes
    GM310799Courtesy of GENERAL MOTORS CORP.
  1. Raise the hood to the service position, perform the following:
    1. Remove the hood hinge bolts (1).
    2. Raise the hood until vertical.
    3. Install the hood hinge bolts until snug in the service position (2).
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  3. Drain the cooling system. Refer to Draining and Filling Cooling System (w/RPO HP2) or Draining and Filling Cooling System (w/o RPO HP2) in Engine Cooling.
  4. Remove the fuel pipes/hoses. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls - 4.3L.
  5. Remove the lower fan shroud. Refer to Fan Shroud Replacement - Lower in Engine Cooling.
  6. Remove the drive belt. Refer to Drive Belt Replacement .
  7. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    8. Fig 2: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  8. If equipped, remove the oil pan skid plate bolts and plate.
  9. If equipped, remove the engine shield. Refer to Engine Protection Shield Replacement in Frame and Underbody.
  10. Remove the starter. Refer to Starter Motor Replacement (4.3L Engine) or Starter Motor Replacement (4.8L, 5.3L, and 6.0L Engines) or Starter Motor Replacement (8.1L Engine) or Starter Motor Replacement (6.6L (LLY) Engine) in Engine Electrical.
    11. Fig 3: Transmission Cover
    GM869720Courtesy of GENERAL MOTORS CORP.
  11. Remove the transmission cover.
    12. Fig 4: Positive Battery Cable Clip Bolt
    GM869722Courtesy of GENERAL MOTORS CORP.
  12. Remove the positive battery cable clip bolt (2).
  13. Remove the catalytic converter. Refer to Catalytic Converter Replacement (4.3L, 4.8L, and 5.3L Engines) or Catalytic Converter Replacement (6.0L and 8.1L Engines) or Catalytic Converter Replacement (6.6L Engine) in Engine Exhaust.
    14. Fig 5: View Of Battery Cable Bracket Bolts
    GM310250Courtesy of GENERAL MOTORS CORP.
  14. Remove the battery cable bracket bolts.
    15. Fig 6: View Of Oil Level Sensor Electrical Connector, CKP Electrical Connector & Battery Ground Bolt
    GM782731Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the crankshaft position (CKP) sensor electrical connector (5) and remove the harness from the retainer clip.
  16. Remove the ground bolt (3) holding the negative battery cable (6) and ground cable (4) to the engine.
    17. Fig 7: Flywheel-To-Torque Converter Bolts
    GM9096Courtesy of GENERAL MOTORS CORP.
  17. If equipped, remove the torque converter bolts.
  18. Remove the transmission bolts.
  19. Lower the vehicle.
    20. Fig 8: View Of Radiator Inlet Hose, Clamps & Thermostat Housing
    GM367002Courtesy of GENERAL MOTORS CORP.
  20. Reposition the radiator inlet hose clamp.
  21. Remove the radiator inlet hose from the thermostat housing.
    22. Fig 9: View Of Radiator Outlet Hose & Water Pump (4.3L)
    GM367001Courtesy of GENERAL MOTORS CORP.
  22. Reposition the radiator outlet hose clamps.
  23. Remove the radiator outlet hose from the surge tank.
  24. Remove the radiator outlet hose from the water pump.
    25. Fig 10: View Of Cruise Control Cable
    GM781993Courtesy of GENERAL MOTORS CORP.
  25. If equipped, disconnect the cruise control cable from the throttle lever.
  26. If equipped, remove the cruise control cable from the accelerator control cable bracket.
    27. Fig 11: View Of Accelerator Cable & Throttle Body Lever
    GM781992Courtesy of GENERAL MOTORS CORP.
  27. Remove the accelerator cable from the throttle body lever.
    28. Fig 12: View Of Accelerator Cable To Accelerator Control Cable Bracket
    GM781990Courtesy of GENERAL MOTORS CORP.
    CAUTION: In order to avoid possible injury or vehicle damage, always replace the accelerator control cable with a NEW cable whenever you remove the engine from the vehicle.
    In order to avoid cruise control cable damage, position the cable out of the way while you remove or install the engine. Do not pry or lean against the cruise control cable and do not kink the cable. You must replace a damaged cable.
  28. Remove the accelerator cable from the accelerator control cable bracket.
    29. Fig 13: Identifying Accelerator Cable/Throttle Body Lever
    GM325556Courtesy of GENERAL MOTORS CORP.
  29. Remove the accelerator cable from the throttle body lever.
    30. Fig 14: View Of Accelerator Control Cable Bracket
    GM398030Courtesy of GENERAL MOTORS CORP.
  30. Remove the accelerator control cable bracket nuts.
  31. Remove the accelerator control cable bracket with the cables attached, from the throttle body.
  32. Reposition and secure the bracket and cable out of the way.
  33. If equipped, remove the air conditioning (A/C) hoses. Refer to Discharge Hose Replacement (LB7) or Discharge Hose Replacement (LR4, LM7, LQ4, L18) and Suction Hose Replacement (LB7 w/Denso) or Suction Hose Replacement (LR4, LM7, LQ4, L18 w/Denso) in Heating, Ventilation, and Air Conditioning.
    34. Fig 15: A/C Compressor Clutch, Engine Wiring Harness & A/C Pressure Switch
    GM782175Courtesy of GENERAL MOTORS CORP.
  34. Disconnect the following electrical connectors:
    • A/C pressure switch (4), if equipped
    • A/C compressor clutch (1), if equipped
  35. Remove the positive cable nut and cable from the generator.
    36. Fig 16: View Of TP Sensor, IAC Motor, ECT Sensor, Control Port Injector Module & Engine Harness Clip Bolt
    GM782174Courtesy of GENERAL MOTORS CORP.
  36. Disconnect the following electrical connectors:
    • Throttle position (TP) sensor (1)
    • Idle air control (IAC) motor (2)
    • Control port injector module (3)
    • Engine coolant temperature (ECT) sensor (5)
  37. Remove the engine wiring harness clip bolt (4).
    38. Fig 17: EVAP Canister Purge Solenoid Valve & MAP Sensor
    GM782178Courtesy of GENERAL MOTORS CORP.
  38. Disconnect the following electrical connectors:
    • Evaporative emission (EVAP) canister purge solenoid valve (1)
    • Manifold absolute pressure (MAP) sensor (2)
    39. Fig 18: Ignition Coil, Ignition Coil Driver, Ground Nut/Cable & Generator Electrical Connectors
    GM782177Courtesy of GENERAL MOTORS CORP.
  39. Disconnect the following electrical connectors:
    • Ignition coil (1)
    • Ignition coil driver (2)
    • Generator (3)
  40. Remove the engine wiring harness ground nut and ground wire (4) from the rear of the right cylinder head.
    41. Fig 19: View Of Ground Strap And CMP & Fuel Pump/Oil Pressure Sensor Connectors
    GM782680Courtesy of GENERAL MOTORS CORP.
  41. Disconnect the following electrical connectors:
    • Knock sensor (1)
    • Camshaft position (CMP) sensor (2)
    • Fuel pump/oil pressure sensor (3)
    • Distributor (2)
  42. Remove the harness ground bolt.
  43. Reposition the harness ground (4) and ground strap (5).
    44. Fig 20: View Of Engine Wiring Harness Bracket & Nuts
    GM310241Courtesy of GENERAL MOTORS CORP.
  44. Remove the engine wiring harness bracket nuts.
  45. Remove the engine wiring harness bracket from the studs.
    46. Fig 21: View Of Junction Block Bracket Bolts
    GM782670Courtesy of GENERAL MOTORS CORP.
  46. Remove the junction block bracket bolt.
  47. Reposition the bracket and wiring harness aside.
    48. Fig 22: Engine Wiring Harness Bracket Stud & Rear Bracket Nut
    GM782176Courtesy of GENERAL MOTORS CORP.
  48. Remove the engine wiring harness rear bracket nut at the EVAP canister purge solenoid valve.
  49. Remove the stud holding the engine wiring harness bracket.
  50. Reposition the engine wiring harness with the bracket aside.
  51. Remove the heater hoses. Refer to Heater Hose Replacement - Inlet (L18) or Heater Hose Replacement - Inlet (LB7) or Heater Hose Replacement - Inlet (LR4, LM7, LQ4) or Heater Hose Replacement - Inlet (LU3) or Heater Hose Replacement - Inlet (W/ HP2 Front) or Heater Hose Replacement - Inlet (W/ HP2 Rear) and Heater Hose Replacement - Outlet (LB7) or Heater Hose Replacement - Outlet (LR4, LM7, LQ4) or Heater Hose Replacement - Outlet (LU3) or Heater Hose Replacement - Outlet (L18) in Heating, Ventilation, and Air Conditioning.
  52. Remove the distributor cap. Refer to Distributor Replacement in Engine Controls - 4.3L.
    53. Fig 23: View Of EVAP Purge Pipe
    GM869711Courtesy of GENERAL MOTORS CORP.
  53. Disconnect the EVAP canister harness from the purge solenoid valve.
    54. Fig 24: Locating Power Brake Booster Vacuum Hose
    GM869713Courtesy of GENERAL MOTORS CORP.
  54. Disconnect the power brake booster vacuum hose from the vacuum fitting.
    55. Fig 25: View Of Power Steering Pump Bracket
    GM340090Courtesy of GENERAL MOTORS CORP.
  55. Loosen the power steering (P/S) pump rear bracket nut.
  56. Remove the P/S pump rear bracket front nut.
  57. Remove the bolts and the nut for the P/S pump bracket.
  58. Leave the A/C compressor, if equipped, and the P/S pump on the bracket.
  59. Slide the P/S pump bracket forward off the stud and set aside.
  60. Remove the thermostat and water outlet. Refer to Thermostat Replacement (4.3L Engine) or Thermostat Replacement (6.6L (LLY) Engine) or Thermostat Replacement (8.1L Engine) in Engine Cooling.
    61. Fig 26: Engine Lift Brackets J 41427
    GM33636Courtesy of GENERAL MOTORS CORP.
  61. Remove the left front and right rear intake manifold lower bolts.
  62. Install J 41427  to the left front and right rear intake manifold bolts, using the following procedure:
    1. Install the J 41427  marked RIGHT REAR.
      NOTE: Refer to Fastener Notice in Cautions and Notices.
    2. Install the lift bracket bolts.

      Tighten:  Tighten the bolts to 15 N.m (11 lb ft).

    3. Install the J 41427  marked LEFT FRONT with the arrow pointing to the front of the engine.
    4. Install the lift bracket bolts.

      Tighten:  Tighten the bolts to 15 N.m (11 lb ft).

  63. Install a suitable lifting devise to the engine lift brackets.
    64. Fig 27: View Of Right Side (Left Side Similar) Engine Mount To Engine Mount Bracket Bolts
    GM310259Courtesy of GENERAL MOTORS CORP.
  64. Remove the engine mount to engine mount bracket nuts.
  65. Support the transmission with a suitable floor jack.
  66. Remove the engine.
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