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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1627 (Engine Mechanical - Hybrid (Hp2) 6.0L (LZ1)) >> Repair Instructions - On Vehicle >> Engine Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Engine Lift Bracket
    GM309151Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Fastener Caution .
  1. Install the J 41798  .

    Tighten: 

    • Tighten the M8 engine lift bracket bolts to 25 N.m (18 lb ft).
    • Tighten the M10 engine lift bracket bolts to 50 N.m (37 lb ft).

  2. Position and install the engine hoist to the J 41798  .
  3. Remove the engine from the engine stand.
  4. Remove the J 21366  .
  5. Install the engine to the vehicle.
  6. Align and install the engine to the transmission. Raise or lower the transmission as required using the floor jack.
  7. Once aligned and mated together completely lower and remove the engine hoist.
    8. Fig 2: View Of Engine Mount Bracket Bolts
    GM1701018Courtesy of GENERAL MOTORS CORP.
  8. Install the left and right engine mount to frame bolts (1).

    Tighten:  Tighten the bolts to 65 N.m (48 lb ft) starting with the middle bolt then either side bolt.

  9. Remove the floor jack from under the transmission.
  10. Raise the vehicle.
    11. Fig 3: Identifying Transmission Bolts/Studs
    GM1969442Courtesy of GENERAL MOTORS CORP.
  11. Install the transmission bolts/studs (1).

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

  12. Install the fuel/EVAP pipe bracket to the stud.
  13. Install the fuel/evaporative emission (EVAP) pipe bracket nut to the transmission stud.

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

    14. Fig 4: Fluid Filler Tube Retaining Nut & Bracket
    GM1975010Courtesy of GENERAL MOTORS CORP.
  14. Install the fluid filler tube bracket to the transmission.
  15. Install the fluid filler tube retaining nut (2).

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

    16. Fig 5: View Of Flywheel To Torque Converter Bolts
    GM1701022Courtesy of GENERAL MOTORS CORP.
    NOTE: Rotate engine clockwise only.
  16. Align the torque dampener bolt holes to the flywheel bolt holes.
  17. With the aid of an assistant, hold the crank pulley, then install the flywheel to torque dampener bolts.

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

    18. Fig 6: Flex Plate Inspection Cover & Bolt
    GM1970180Courtesy of GENERAL MOTORS CORP.
  18. Install the right flex plate inspection cover (1).
  19. Install the right flex plate inspection cover bolt (2).

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

  20. Install the catalytic converter. Refer to Catalytic Converter Replacement (LY6 with Exhaust Flange) or Catalytic Converter Replacement (L9H with Exhaust Flange) or Catalytic Converter Replacement (Gen IV Engines with Exhaust Clamp) or Catalytic Converter Replacement (LFA with Exhaust Clamp) or Catalytic Converter Replacement (LMM) .
  21. Lower the vehicle.
    22. Fig 7: Identifying Engine Lift Bracket
    GM309151Courtesy of GENERAL MOTORS CORP.
  22. Remove the J 41798  .
  23. Install the 3 phase cable bracket to the right cylinder head.
  24. Install the ignition coil(s) and spark plug wire(s), as required. Refer to Ignition Coil Replacement .
  25. Raise the vehicle.
    26. Fig 8: View Of Coolant Heater Cord
    GM1699547Courtesy of GENERAL MOTORS CORP.
  26. Connect the coolant heater cord to the coolant heater, if equipped.
    27. Fig 9: Identifying CKP Sensor Harness & Connector
    GM1969176Courtesy of GENERAL MOTORS CORP.
  27. Connect the engine harness electrical connector (1) to the CKP sensor.
  28. Connect the engine harness electrical connector (2) to the knock sensor.
  29. Connect the engine harness electrical connector (3) to the oil level sensor.
    30. Fig 10: Identifying A/C Refrigerant Pressure Sensor Harness & Connector
    GM1969134Courtesy of GENERAL MOTORS CORP.
  30. Connect the engine harness electrical connector (2) to the A/C refrigerant pressure sensor.
  31. Connect the auxiliary heater water pump electrical connector (1).
    32. Fig 11: Identifying CMP Sensor & Connector
    GM1968149Courtesy of GENERAL MOTORS CORP.
  32. Connect the engine harness electrical connector (1) to the CMP sensor wire harness.
    33. Fig 12: View Of Engine Harness Components
    GM1699536Courtesy of GENERAL MOTORS CORP.
  33. Connect the engine harness electrical connector (4) to the knock sensor.
  34. Position the engine harness grounds (3) to the engine block.
  35. Install the engine harness ground stud (2) to the engine block.

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

  36. Install the engine harness clip (1) to the ground stud.
  37. Lower the vehicle.
  38. Position the engine ground wire to the right cylinder head.
  39. Install the engine harness stud (1) to the right cylinder head.

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

    40. Fig 13: View Of Engine Ground Strap & Bolt
    GM1699550Courtesy of GENERAL MOTORS CORP.
  40. Position the engine ground strap to the cylinder head and cowl.
  41. Install the engine ground strap bolt to the rear of the left cylinder head and cowl.

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

    42. Fig 14: View Of Engine Bracket, Nut & Bolts
    GM1965810Courtesy of GENERAL MOTORS CORP.
  42. Install the engine bracket (3) to the ignition coil bracket stud and install nut (1).

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

  43. Raise the vehicle half way.
  44. Working through the wheel opening, install the engine bracket bolts (2).

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

    45. Fig 15: Locating 3 Phase Cable Clip Nut & Engine Bracket
    GM1965809Courtesy of GENERAL MOTORS CORP.
  45. Install the right wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Right Side (Chevrolet) or Front Wheelhouse Liner Replacement - Right Side (GMC) .
  46. Position the generator control module 3 phase cables to the bracket channel.
  47. Install the generator control module 3 phase cable clip to the tab (3) on the engine bracket (2).
  48. Install the generator control module 3 phase cable clip nut (1).

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

    49. Fig 16: View Of Engine Harness Electrical Connectors & Inlet Hose Clamp
    GM1697098Courtesy of GENERAL MOTORS CORP.
  49. Connect the engine harness electrical connector (1) to the oil pressure sensor.
  50. Connect the engine harness electrical connector (2) to the lifter oil manifold.
  51. Install the heater hoses. Refer to Heater Inlet Hose Replacement (Non-HP2) and Heater Outlet Hose Replacement (Non-HP2) .
    52. Fig 17: Identifying Radiator Outlet Hose Clamp At Water Pump
    GM1969001Courtesy of GENERAL MOTORS CORP.
  52. Install the radiator outlet hose to the water pump.
  53. Position the radiator outlet hose clamp (1) at the water pump.
    54. Fig 18: View Of Radiator Vent Inlet Hose Clamp At Water Pump
    GM1696566Courtesy of GENERAL MOTORS CORP.
  54. Install the radiator inlet hose to the water pump.
  55. Position the radiator inlet hose clamp (3) at the water pump.
    56. Fig 19: View Of Radiator Vent Inlet Hose & Clamps
    GM1699347Courtesy of GENERAL MOTORS CORP.
  56. Position and install the radiator vent inlet hose (2) to the air bleed pipe.
  57. Position the radiator vent inlet hose clamp (1) at the air bleed pipe.
  58. Install the radiator vent inlet hose (2) to the radiator inlet hose clip (3).
  59. Position the generator battery jumper to the engine.
  60. Install the intake manifold. Refer to Intake Manifold Replacement .
  61. Connect the cables from the generator control module.
  62. Connect the A/C pressure sensor electrical connector.
  63. Connect the A/C lines from the A/C compressor. Refer to Discharge Hose Replacement (LMM) or Discharge Hose Replacement (LY2, LMF, L76 and L92) and Suction Hose Replacement (LY2, LMF, L76 and L92) or Suction Hose Replacement (LMM) .
    64. Fig 20: View Of Oil Pan Skid Plate & Bolts
    GM1698083Courtesy of GENERAL MOTORS CORP.
  64. For 2500 series vehicles, install the oil pan skid plate and bolts, if equipped.

    Tighten:  Tighten the bolts to 28 N.m (21 lb ft).

    65. Fig 21: View Of Oil Pan Skid Plate & Bolts
    GM1698082Courtesy of GENERAL MOTORS CORP.
  65. For 1500 series vehicles, install the oil pan skid plate and bolts, if equipped.

    Tighten:  Tighten the bolts to 28 N.m (21 lb ft).

  66. Lower the vehicle.
  67. Install the front end upper tie bar. Refer to Front End Upper Tie Bar Replacement .
  68. Install the hood latch. Refer to Hood Primary and Secondary Latch Replacement .
    69. Fig 22: View Of Service Piston Notch
    GM1711844Courtesy of GENERAL MOTORS CORP.
    NOTE: There is a positive stop which limits the hood from being opened too far.
  69. With the aid of the assistant raise the hood slightly until the hood hinge bolts can be removed from the service position notch (1).
    70. Fig 23: View Of Hood Strut Rod, Grille End Caps & Hood Hinge Bolts
    GM1711842Courtesy of GENERAL MOTORS CORP.
  70. With the aid of an assistant lower the hood and install the hood hinge bolts (3) to the hood hinges.

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

  71. Install the hood strut rod (1) to the hood strut bracket stud.
  72. Install the air inlet grille end caps (2), push down the end cap in order to engage the retainers.
    73. Fig 24: View Of Ground Strap & Nut
    GM1823089Courtesy of GENERAL MOTORS CORP.
  73. Install the ground strap to the hood stud.
  74. Install the ground strap nut at the hood stud.

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

  75. Refill the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) or Cooling System Draining and Filling (Static Fill) .
  76. Prelube the engine. Refer to Engine Prelubing .
  77. Enable the high voltage system. Refer to High Voltage Enabling .
  78. Perform the CKP system variation learn procedure. Refer to Crankshaft Position System Variation Learn .
    79. NOTE: After an overhaul the engine should be tested.
  79. Use the following procedure after the engine is installed in the vehicle:
    1. Disable the ignition system.
    2. Crank the engine several times. Listen for any unusual noises or evidence that parts are binding.
    3. Enable the ignition system.
    4. Start the engine and listen for unusual noises.
    5. Check the vehicle oil pressure gauge or light and confirm that the engine has acceptable oil pressure.
    6. Run the engine speed at about 1,000 RPM until the engine has reached normal operating temperature.
    7. Listen for sticking lifters or other unusual noises.
    8. Inspect for fuel, oil and/or coolant leaks while the engine is running.
    9. Perform a final inspection for the proper oil and coolant levels.
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