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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.8L, 5.3L & 6.0L (Repair Instructions - 1 Of 3) >> Repair Instructions (On-Vehicle And Off-Vehicle - Part 1) >> On-Vehicle Repair Instructions >> Engine Replacement (4.8L, 5.3L & 6.0L Engines) >> Removal Procedure

Removal Procedure

    Fig 1: Identifying Hood Hinge Normal And Service Position Bolt Holes
    GM310799Courtesy of GENERAL MOTORS CORP.
  1. Open the hood.
  2. Place the fender covers over both fenders.
  3. Raise the hood to the service position and 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).
  4. Remove the air conditioning (A/C) compressor. Refer to Compressor Replacement (L18) or Compressor Replacement (LR4, LM7, and LQ4) or Compressor Replacement (LLY) in HVAC Systems - Manual.
  5. Remove the radiator support. Refer to Radiator Support Replacement in Body Front End.
  6. Remove the engine sight shield. Refer to Engine Sight Shield Replacement (4.8L, 5.3L & 6.0L W/RPO LQ4)  or Engine Sight Shield Replacement (6.0L W/RPO LQ9) .
    7. Fig 2: View Of Radiator Inlet Hose
    GM846666Courtesy of GENERAL MOTORS CORP.
  7. Open the hose clamp and remove the radiator inlet hose from the water pump.
    8. Fig 3: View Of Radiator Outlet Hose (4.8L, 5.3L & 6.0L Engines)
    GM846668Courtesy of GENERAL MOTORS CORP.
  8. Open the hose clamp and remove the radiator outlet hose from the water pump.
  9. 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.
    10. Fig 4: View Of EVAP Canister Purge Solenoid & Generator Electrical Connectors & Bracket Nut
    GM1235683Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the following electrical connectors:
    • The evaporative emission (EVAP) canister purge solenoid (1)
    • The generator (3)
  11. Remove the harness bracket nut (2) in order to remove the engine harness from the intake manifold.
    12. Fig 5: View Of Vent Inlet Hose At Throttle Body
    GM659465Courtesy of GENERAL MOTORS CORP.
  12. Reposition the vent inlet hose clamp at the throttle body.
  13. Remove the radiator vent inlet hose from the throttle body.
    14. Fig 6: View Of Generator Cable & Nut
    GM395686Courtesy of GENERAL MOTORS CORP.
  14. Remove the generator cable from the generator and perform the following procedure:
    1. Slide the boot down revealing the terminal stud.
    2. Remove the generator cable nut from the terminal stud.
    3. Remove the generator cable.
    15. Fig 7: View Of Main Ignition Coil Wire Harness Connector & Clips
    GM757686Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the main coil harness (2) and fuel injector electrical connectors on the left side.
    16. Fig 8: View Of CPA Retainer, Harness Clips, ETC, Coil Harness & Fuel Injectors Electrical Connectors
    GM1235686Courtesy of GENERAL MOTORS CORP.
  16. Disconnect the following electrical connectors:
    • The main coil harness (4)
    • The fuel injectors (3)
    • The electronic throttle control (ETC) (2)
    17. Fig 9: View Of MAP Sensor & Knock Sensor Electrical Connectors
    GM679510Courtesy of GENERAL MOTORS CORP.
  17. Disconnect the manifold absolute pressure (MAP) sensor (1) and knock sensor (2) electrical connectors.
    18. Fig 10: View Of Engine Wiring Harness Ground Bolt, ECT Sensor Electrical Connector, Negative Battery Cable & Harness Ground (4.8L, 5.3L & 6.0L Engines)
    GM1235684Courtesy of GENERAL MOTORS CORP.
  18. Remove the harness ground bolt.
  19. Reposition the harness ground and negative battery cable from the block.
  20. Disconnect the following electrical connectors:
    • The engine coolant temperature (ECT) sensor (5)
    • The electronic variable orifice switch
    21. Fig 11: View Of Oil Pressure Sensor, Harness Ground & CMP Sensor Electrical Connector
    GM1236366Courtesy of GENERAL MOTORS CORP.
  21. Remove the harness ground bolt at the right rear of the engine block.
  22. Reposition the harness ground and auxiliary negative battery cable, if equipped, from the block.
  23. Remove the harness ground bolt at the left rear of the engine block.
  24. Reposition the harness ground and engine ground strap from the block.
  25. Disconnect the following electrical connectors:
    • The oil pressure sensor (1)
    • The camshaft position (CMP) sensor (3)
  26. Unclip all of the engine harness clips from the engine.
    27. Fig 12: View Of Battery Cable Junction Block (4.8L, 5.3L & 6.0L Engines)
    GM662505Courtesy of GENERAL MOTORS CORP.
  27. Remove the battery cable junction block from the junction block bracket.
    28. Fig 13: View Of EVAP Tube Ends (4.8L, 5.3L & 6.0L Engines)
    GM832127Courtesy of GENERAL MOTORS CORP.
  28. Remove the EVAP purge solenoid vent tube. Perform the following procedure:
    1. Remove the EVAP tube end from the solenoid (1).
    2. Remove the EVAP tube end from the vapor pipe (2).
  29. Disconnect the fuel pipes. Refer to Quick Connect Fitting(s) Service (Metal Collar) in Engine Controls - 4.8L, 5.3L & 6.0L.
  30. Raise the vehicle.
    31. Fig 14: View Of Oil Level Sensor & CKP Sensor Electrical Connector
    GM1235682Courtesy of GENERAL MOTORS CORP.
  31. Disconnect the following electrical connectors:
    • The crankshaft position (CKP) sensor (1)
    • The engine oil sensor (3)
    • The coolant heater, if equipped
    32. Fig 15: View Of Battery Cable Channel Bolt
    GM1236368Courtesy of GENERAL MOTORS CORP.
  32. Remove the battery cable channel bolt.
  33. Slide the channel pin out of the oil pan tab.
  34. Gather all branches of the engine wiring harness and reposition off to the side.
  35. Lower the vehicle.
    36. Fig 16: View Of Generator Bracket & Bolts
    GM310813Courtesy of GENERAL MOTORS CORP.
  36. Remove the rear power steering to engine block bolt.
  37. Remove the generator bracket bolts.
  38. Position the bracket aside.
    39. Fig 17: View Of Vacuum Brake Booster Hose To Intake Manifold Rear
    GM1236362Courtesy of GENERAL MOTORS CORP.
  39. Remove the vacuum brake booster hose.
  40. Remove the ignition coils, as required, for the proper fit of the J 41798  before lifting the engine. See Special Tools . Refer to Ignition Coil(s) Replacement in Engine Controls - 4.8L, 5.3L & 6.0L.
    41. Fig 18: View Of J 41798
    GM309151Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  41. Install the J 41798  to the cylinder heads. See Special Tools .

    Tighten: 

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

    42. Fig 19: View Of Engine Mount-To-Engine Mount Bracket
    GM307275Courtesy of GENERAL MOTORS CORP.
  42. Remove the left and right engine mount to engine mount bracket bolts.
  43. Raise the vehicle.
    44. Fig 20: View Of Engine Protection Shield
    GM349061Courtesy of GENERAL MOTORS CORP.
  44. Remove the engine sight shield bolts and shield.
    45. Fig 21: Identifying Oil Pan Skid Plate
    GM309158Courtesy of GENERAL MOTORS CORP.
  45. Remove the oil pan skid plate bolts and plate, if equipped.
  46. Drain the engine oil.
  47. Remove the starter motor. Refer to Starter Motor Replacement (4.3L Engine) or Starter Motor Replacement (4.8L, 5.3L & 6.0L Engines) or Starter Motor Replacement (6.6L (LLY) Engine) or Starter Motor Replacement (8.1L Engine) in Engine Electrical.
  48. 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.
    49. Fig 22: View Of Positive Battery Cable Clip & Bolt
    GM310672Courtesy of GENERAL MOTORS CORP.
  49. Remove the positive battery cable clip bolt and clip.
    50. Fig 23: Flywheel-To-Torque Converter Bolts
    GM9096Courtesy of GENERAL MOTORS CORP.
  50. Remove the torque converter bolts, if equipped.
    51. Fig 24: View Of Oil Level Indicator Tube Nut
    GM396797Courtesy of GENERAL MOTORS CORP.
  51. Remove the transmission oil level indicator tube nut, if equipped.
    52. Fig 25: View Of Oil Level Indicator Tube & Seal
    GM396798Courtesy of GENERAL MOTORS CORP.
  52. Remove the transmission oil level indicator tube, if equipped.
    53. Fig 26: View of Transmission Bolt & Stud (4L60-E)
    GM859004Courtesy of GENERAL MOTORS CORP.
  53. If equipped with a 4L60-E transmission, remove the transmission bolt and stud on the right side.
    54. Fig 27: View Of Transmission Converter Cover Bolt (4L80-E)
    GM396795Courtesy of GENERAL MOTORS CORP.
  54. If equipped with a 4L80-E transmission, remove the transmission converter cover bolts.
    55. Fig 28: View Of Automatic Transmission Bolt/Studs (4.8L, 5.3L & 6.0L Engines)
    GM859003Courtesy of GENERAL MOTORS CORP.
  55. Remove the automatic transmission bolt/studs, if equipped.
  56. Separate the engine from the automatic transmission, if equipped. Install the J 21366  to the transmission in order to hold the torque converter. See Special Tools .
    57. Fig 29: View Of Clutch Line & Concentric Slave Cylinder
    GM33768Courtesy of GENERAL MOTORS CORP.
  57. Using J 42371  , remove the clutch line form the concentric slave cylinder. See Special Tools .
    58. Fig 30: View Of Manual Transmission Stud (Right Side)
    GM394444Courtesy of GENERAL MOTORS CORP.
  58. Remove the manual transmission stud on the right side of the transmission, if equipped.
    59. Fig 31: View Of Transmission Mounting Bolts (Manual Transmission)
    GM394442Courtesy of GENERAL MOTORS CORP.
  59. Remove the manual transmission bolt/studs, if equipped.
  60. Separate the manual transmission from the engine, if equipped.
    61. Fig 32: View Of Clutch Pressure Plate & Disc
    GM685828Courtesy of GENERAL MOTORS CORP.
  61. Mark the flywheel and a clutch pressure plate lug for installation alignment.
  62. Remove the clutch pressure plate bolts, if equipped.
  63. Remove the clutch pressure plate and disc, if equipped.
  64. Lower the vehicle.
  65. Install an engine hoist to the J 41798  . See Special Tools .
  66. Install a floor jack under the transmission for support.
    67. NOTE: Use care while moving the engine assembly in order to avoid breaking the MAP sensor locating tabs. Broken MAP sensor tabs may result in decreased engine performance.
  67. Remove the engine.
  68. Install the engine to an engine stand.
  69. Remove the engine hoist.
    70. Fig 33: View Of J 41798
    GM309151Courtesy of GENERAL MOTORS CORP.
  70. Remove the J 41798  from the engine. See Special Tools .
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