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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 >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Right Side (Left Side Similar) Engine Mount To Engine Mount Bracket Bolts
    GM310259Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  1. Install the engine.
  2. Install the engine mount to engine mount bracket bolts.

    Tighten:  Tighten the bolts to 65 N.m (48 lb ft).

    3. Fig 2: Engine Lift Brackets J 41427
    GM33636Courtesy of GENERAL MOTORS CORP.
  3. Remove the lifting devise and the J 41427 
  4. Apply threadlock GM P/N 12345382, (Canadian P/N 10953489), or equivalent to the threads of the intake manifold lower bolts.
  5. Install the intake manifold bolts.

    Tighten: 

    1. Tighten the bolts a first pass to 3 N.m (27 lb in).
    2. Tighten the bolts a second pass to 12 N.m (106 lb in).
    3. Tighten the bolts a final pass to 15 N.m (11 lb ft).

  6. Install one transmission bolt until snug.
  7. Remove the support jack from under the transmission.
  8. Install 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.
    9. Fig 3: View Of Power Steering Pump Bracket
    GM340090Courtesy of GENERAL MOTORS CORP.
  9. Slide the P/S pump bracket onto the stud.
  10. Install the bolts and the nut for the P/S pump bracket.
  11. Install the P/S pump rear bracket front nut.
  12. Tighten the P/S pump rear bracket nut.

    Tighten:  Tighten the bolts and nuts to 41 N.m (30 lb ft).

    13. Fig 4: Locating Power Brake Booster Vacuum Hose
    GM869713Courtesy of GENERAL MOTORS CORP.
  13. Connect the power brake booster vacuum hose to the vacuum fitting.
    14. Fig 5: View Of EVAP Purge Pipe
    GM869711Courtesy of GENERAL MOTORS CORP.
  14. Connect the EVAP canister harness to the purge solenoid valve.
  15. Install the distributor cap. Refer to Distributor Replacement in Engine Controls - 4.3L.
  16. Install 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.
    17. Fig 6: Engine Wiring Harness Bracket Stud & Rear Bracket Nut
    GM782176Courtesy of GENERAL MOTORS CORP.
  17. Position the engine wiring harness.
  18. Install the stud holding the engine wiring harness bracket.
  19. Install the engine wiring harness rear bracket nut at the EVAP canister purge solenoid valve.

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

    20. Fig 7: View Of Junction Block Bracket Bolts
    GM782670Courtesy of GENERAL MOTORS CORP.
  20. Position the bracket and wiring harness.
  21. Install the junction block bracket bolt.

    Tighten:  Tighten the bolt to 25 N.m (18 lb ft).

    22. Fig 8: View Of Engine Wiring Harness Bracket & Nuts
    GM310241Courtesy of GENERAL MOTORS CORP.
  22. Install the engine wiring harness bracket to the studs.
  23. Install the engine wiring harness bracket nuts.

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

    24. Fig 9: View Of Ground Strap And CMP & Fuel Pump/Oil Pressure Sensor Connectors
    GM782680Courtesy of GENERAL MOTORS CORP.
  24. Position the harness ground (4) and ground strap (5).
  25. Install the harness ground bolt.

    Tighten:  Tighten the bolt to 16 N.m (12 lb ft).

  26. Connect the following electrical connectors:
    • Knock sensor (1)
    • CMP sensor (2)
    • Fuel pump/oil pressure sensor (3)
    • Distributor (2)
    27. Fig 10: Ignition Coil, Ignition Coil Driver, Ground Nut/Cable & Generator Electrical Connectors
    GM782177Courtesy of GENERAL MOTORS CORP.
  27. Install the engine wiring harness ground nut and ground wire (4) to the rear of the right cylinder head.

    Tighten:  Tighten the nut to 16 N.m (12 lb ft).

  28. Connect the following electrical connectors:
    • Ignition coil (1)
    • Ignition coil driver (2)
    • Generator (3)
    29. Fig 11: EVAP Canister Purge Solenoid Valve & MAP Sensor
    GM782178Courtesy of GENERAL MOTORS CORP.
  29. Connect the following electrical connectors:
    • EVAP canister purge solenoid valve (1)
    • MAP sensor (2)
    30. Fig 12: View Of TP Sensor, IAC Motor, ECT Sensor, Control Port Injector Module & Engine Harness Clip Bolt
    GM782174Courtesy of GENERAL MOTORS CORP.
  30. Install the engine wiring harness clip bolt (4).

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

  31. Connect the following electrical connectors:
    • TP sensor (1)
    • IAC motor (2)
    • Control port injector module (3)
    • ECT sensor (5)
    32. Fig 13: A/C Compressor Clutch, Engine Wiring Harness & A/C Pressure Switch
    GM782175Courtesy of GENERAL MOTORS CORP.
  32. Install the positive cable and nut to the generator.

    Tighten:  Tighten the nut to 18 N.m (13 lb ft).

  33. Connect the following electrical connectors:
    • A/C pressure switch (4), if equipped
    • A/C compressor clutch (1), if equipped
  34. If equipped, install the 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.
    35. Fig 14: View Of Accelerator Control Cable Bracket
    GM398030Courtesy of GENERAL MOTORS CORP.
  35. Position the bracket and cables.
  36. Install the accelerator control cable bracket with the cables attached, to the throttle body.
  37. Install the accelerator control cable bracket nuts.

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

    38. Fig 15: Identifying Accelerator Cable/Throttle Body Lever
    GM325556Courtesy of GENERAL MOTORS CORP.
  38. Install the accelerator cable to the throttle body lever.
    39. Fig 16: 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.
  39. Install the accelerator cable to the accelerator control cable bracket.
    40. Fig 17: View Of Accelerator Cable & Throttle Body Lever
    GM781992Courtesy of GENERAL MOTORS CORP.
  40. Install the accelerator cable to the throttle body lever.
    41. Fig 18: View Of Cruise Control Cable
    GM781993Courtesy of GENERAL MOTORS CORP.
  41. If equipped, install the cruise control cable to the accelerator control cable bracket.
  42. If equipped, connect the cruise control cable to the throttle body lever.
    43. Fig 19: View Of Radiator Outlet Hose & Water Pump (4.3L)
    GM367001Courtesy of GENERAL MOTORS CORP.
  43. Install the radiator outlet hose to the water pump.
  44. Install the radiator outlet hose to the surge tank.
  45. Position the radiator outlet hose clamps.
    46. Fig 20: View Of Radiator Inlet Hose, Clamps & Thermostat Housing
    GM367002Courtesy of GENERAL MOTORS CORP.
  46. Install the radiator inlet hose to the thermostat housing.
  47. Position the radiator inlet hose clamp.
  48. Install the drive belt. Refer to Drive Belt Replacement .
  49. Install the lower fan shroud. Refer to Fan Shroud Replacement - Lower in Engine Cooling.
  50. Install the fuel pipes/hoses. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls - 4.3L.
    51. Fig 21: Identifying Hood Hinge Normal And Service Position Bolt Holes
    GM310799Courtesy of GENERAL MOTORS CORP.
  51. Remove the hood hinge bolt from the service position (2).
  52. Lower the hood to the normal position.
  53. Install the hood hinge bolts.

    Tighten:  Tighten the bolts to 25 N.m (18 lb ft).

  54. Raise the vehicle.
    55. Fig 22: Flywheel-To-Torque Converter Bolts
    GM9096Courtesy of GENERAL MOTORS CORP.
  55. Install the transmission bolts

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

  56. If equipped, Install the torque converter bolts.

    Tighten:  Tighten the bolts to 63 N.m (47 lb ft).

    57. Fig 23: View Of Oil Level Sensor Electrical Connector, CKP Electrical Connector & Battery Ground Bolt
    GM782731Courtesy of GENERAL MOTORS CORP.
  57. Install the ground bolt (3) holding the negative battery cable (6) and ground cable (4) to the engine.
  58. Connect the CKP sensor electrical connector (5) and install the harness to the retainer clip.
    59. Fig 24: View Of Battery Cable Bracket Bolts
    GM310250Courtesy of GENERAL MOTORS CORP.
  59. Install the battery cable bracket bolts.

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

  60. Install 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.
    61. Fig 25: Positive Battery Cable Clip Bolt
    GM869722Courtesy of GENERAL MOTORS CORP.
  61. Install the positive battery cable clip bolt (2).
    62. Fig 26: Transmission Cover
    GM869720Courtesy of GENERAL MOTORS CORP.
  62. Install the transmission cover.

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

  63. Install 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.
  64. If equipped, install the engine shield. Refer to Engine Protection Shield Replacement in Frame and Underbody.
    65. Fig 27: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  65. If equipped, install the oil pan skid plate and bolts.

    Tighten:  Tighten the bolts to 20 N.m (15 lb ft).

  66. Lower the vehicle.
  67. Connect 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.
  68. Perform the engine prelube procedure. Refer to Engine Prelubing 
  69. Add engine oil supplement GM P/N 1052367 (Canadian P/N 992869), or equivalent to the engine oil.
  70. Fill 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.
  71. If equipped, bleed the hydraulic clutch. Refer to Hydraulic Clutch Bleeding in Clutch.
  72. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging in Heating, Ventilation, and Air Conditioning.
    IMPORTANT: After an overhaul, the engine should be tested. Use the following procedure after the engine is installed in the vehicle.
  73. Disable the ignition system.
  74. Crank the engine several times. Listen for any unusual noises or evidence that parts are binding.
  75. Start the engine and listen for unusual noises.
  76. Check the oil pressure gauge or light and confirm that the engine has acceptable oil pressure.
  77. If necessary, install an oil pressure gauge and measure the oil pressure.
  78. Run the engine speed at about 1, 000 RPM until the engine has reached normal operating temperature.
  79. Listen for sticking valve lifters, or other unusual noises.
  80. Inspect for fuel, oil, and/or coolant leaks while the engine is running.
  81. Verify that the distributor is properly positioned.
  82. Perform a final inspection for the proper oil and coolant levels.
  83. Close the hood.
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