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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1063 (Engine Mechanical - 4.3L) >> Repair Instructions - On Vehicle >> Engine Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Engine Mount To Engine Mount Bracket & Bolts
    GM310259Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  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 to the threads of the intake manifold lower bolts.
  5. Install the intake manifold bolts. Refer to Sealers, Adhesives, and Lubricants  for the correct part number.

    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 Engine Coolant Thermostat Replacement .
    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. Connect the power brake booster vacuum hose to the vacuum fitting.
    14. Fig 4: View Of Engine Wiring Harness Electrical Connector
    GM1876873Courtesy of GENERAL MOTORS CORP.
  14. Connect the engine wiring harness electrical connector (7) from the ignition coil.
    15. Fig 5: View Of EVAP Canister Purge Solenoid Valve Tube Quick Connect Fitting
    GM1876612Courtesy of GENERAL MOTORS CORP.
  15. Connect the EVAP canister harness (1) to the purge solenoid valve.
  16. Install the heater hoses. Refer to Heater Inlet Hose Replacement (Non-HP2) and Heater Outlet Hose Replacement .
    17. Fig 6: Engine Wiring Harness Rear Bracket Nut & Stud Holding Engine Wiring Harness Bracket
    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)
    27. Fig 10: View Of Engine Wiring Harness & Components
    GM1876492Courtesy of GENERAL MOTORS CORP.
  27. Connect the engine wiring harness electrical connector (2) to the throttle body.
  28. Connect the following electrical connectors:
    • EVAP canister purge solenoid valve (1)
    • MAP sensor
    29. Fig 11: View Of Engine Wiring Harness Rear Bracket & Bolts
    GM1876871Courtesy of GENERAL MOTORS CORP.
  29. Place the engine wiring harness rear bracket onto the upper intake manifold and install the bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    30. Fig 12: View Of Engine Wiring Harness Clips
    GM1876870Courtesy of GENERAL MOTORS CORP.
  30. Install the engine wiring harness clips (1, 2) to the engine harness brackets.
    31. Fig 13: View Of A/C Pressure Switch & Compressor Clutch Connectors
    GM1878341Courtesy of GENERAL MOTORS CORP.
  31. If equipped, install the A/C hoses.
  32. Connect the following electrical connectors:
    • The A/C compressor clutch (2), if equipped
    • The A/C pressure switch (1), if equipped
    33. Fig 14: View Of Radiator Outlet Hose
    GM367001Courtesy of GENERAL MOTORS CORP.
  33. Install the radiator outlet hose to the water pump.
  34. Install the radiator outlet hose to the surge tank.
  35. Position the radiator outlet hose clamps.
    36. Fig 15: View Of Radiator Inlet Hose, Clamps & Thermostat Housing
    GM367002Courtesy of GENERAL MOTORS CORP.
  36. Install the radiator inlet hose to the thermostat housing.
  37. Position the radiator inlet hose clamp.
  38. Install the drive belt. Refer to Drive Belt Replacement .
  39. Install the lower fan shroud. Refer to Engine Coolant Fan Lower Shroud Replacement (Mechanical) .
  40. Install the fuel pipes/hoses. Refer to Fuel Hose/Pipes Replacement - Engine Compartment .
    41. Fig 16: Identifying Hood Hinge Normal And Service Position Bolt Holes
    GM310799Courtesy of GENERAL MOTORS CORP.
  41. Remove the hood hinge bolt from the service position (2).
  42. Lower the hood to the normal position.
  43. Install the hood hinge bolts.

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

  44. Raise the vehicle.
    45. Fig 17: Flywheel-To-Torque Converter Bolts
    GM9096Courtesy of GENERAL MOTORS CORP.
  45. Install the transmission bolts.

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

  46. If equipped, install the torque converter bolts.

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

    47. Fig 18: View Of Oil Level Sensor Electrical Connector, CKP Electrical Connector & Battery Ground Bolt
    GM782731Courtesy of GENERAL MOTORS CORP.
  47. Install the ground bolt (3) holding the negative battery cable (6) and ground cable (4) to the engine.
  48. Connect the CKP sensor electrical connector (5) and install the harness to the retainer clip.
    49. Fig 19: View Of Battery Cable Bracket Bolts
    GM310250Courtesy of GENERAL MOTORS CORP.
  49. Install the battery cable bracket bolts.

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

  50. Install the catalytic converter. Refer to Catalytic Converter Replacement (4.3L) .
    51. Fig 20: Positive Battery Cable Clip Bolt
    GM869722Courtesy of GENERAL MOTORS CORP.
  51. Install the positive battery cable clip bolt (2).
    52. Fig 21: Transmission Cover
    GM869720Courtesy of GENERAL MOTORS CORP.
  52. Install the transmission cover.

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

  53. Install the starter. Refer to Starter Motor Replacement (4.3L) .
  54. If equipped, install the engine shield. Refer to Engine Shield Replacement .
    55. Fig 22: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  55. If equipped, install the oil pan skid plate and bolts.

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

  56. Lower the vehicle.
  57. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (w/Single Battery) or Battery Negative Cable Disconnection and Connection (w/Auxiliary Battery) or Battery Negative Cable Disconnection and Connection (w/Dual Batteries) .
  58. Perform the engine prelube procedure. Refer to Engine Prelubing .
  59. Add engine oil supplement to the engine oil. Refer to Sealers, Adhesives, and Lubricants  for the correct part number.
  60. Fill the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) or Cooling System Draining and Filling (Static Fill) .
  61. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
    IMPORTANT: After an overhaul, the engine should be tested. Use the following procedure after the engine is installed in the vehicle.
  62. Disable the ignition system.
  63. Crank the engine several times. Listen for any unusual noises or evidence that parts are binding.
  64. Start the engine and listen for unusual noises.
  65. Check the oil pressure gauge or light and confirm that the engine has acceptable oil pressure.
  66. If necessary, install an oil pressure gage and measure the oil pressure.
  67. Run the engine speed at about 1,000 RPM until the engine has reached normal operating temperature.
  68. Listen for sticking valve lifters, or other unusual noises.
  69. Inspect for fuel, oil, and/or coolant leaks while the engine is running.
  70. Perform a final inspection for the proper oil and coolant levels.
  71. Close the hood.
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