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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 5.3L) >> Repair Instructions - On Vehicle >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Inlet Hose At The Radiator
    GM1524230Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (LS4) .
  2. Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
  3. Evacuate the air conditioning (A/C) system. Refer to Refrigerant Recovery and Recharging .
  4. Remove the front tires and wheels. Refer to Tire and Wheel Removal and Installation .
  5. Drain the cooling system. Refer to Cooling System Draining and Filling (LS4 Static Fill) or Cooling System Draining and Filling (LS4 GE 47716 Fill) .
  6. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .
  7. Lower the vehicle.
  8. Using the J 38185  reposition the inlet hose clamp at the radiator. See Special Tools .
  9. Remove the inlet hose from the radiator.
    10. Fig 2: Outlet Hose At The Radiator
    GM1524227Courtesy of GENERAL MOTORS CORP.
  10. Using the J 38185  reposition the outlet hose clamp at the radiator. See Special Tools .
  11. Disengage the outlet hose clips from the fan shroud.
  12. Remove the outlet hose from the radiator.
    13. Fig 3: A/C Compressor Hose Nut & A/C Receiver/Dehydrator Tube
    GM1562059Courtesy of GENERAL MOTORS CORP.
  13. Remove the A/C compressor hose nut at the A/C receiver/dehydrator tube.
  14. Remove the A/C compressor hose.
    15. Fig 4: A/C Compressor Hose & Nut At The A/C Condenser
    GM1562061Courtesy of GENERAL MOTORS CORP.
  15. Remove the A/C compressor hose nut at the A/C condenser.
  16. Remove the A/C compressor hose.
    17. Fig 5: View Of Brake Booster Vacuum Hose
    GM1551866Courtesy of GENERAL MOTORS CORP.
  17. Remove the brake booster vacuum hose from the brake booster (3).
  18. Remove the brake booster vacuum hose (1) from the intake manifold (2).
    19. Fig 6: Engine Harness Electrical Connectors & Brake Fluid Level Switch Electrical Connector
    GM1561313Courtesy of GENERAL MOTORS CORP.
  19. Disconnect the engine harness electrical connectors (1, 2) from the instrument panel (I/P) harness electrical connectors.
  20. Disconnect the brake fluid level switch electrical connector (3) from the master cylinder.
    21. Fig 7: Master Cylinder Brake Pipe Fittings
    GM1561264Courtesy of GENERAL MOTORS CORP.
  21. Remove brake fluid from the master cylinder.
  22. Disconnect the from brake pipe fittings (1, 2) from the master cylinder.
    23. Fig 8: Anti Lock Brake (ABS) Module Brake Pipe Fittings
    GM1561268Courtesy of GENERAL MOTORS CORP.
  23. Disconnect the brake pipe fittings (1, 2) from the antilock brake (ABS) module.
    24. Fig 9: View Of Master Cylinder & Nuts
    GM1561262Courtesy of GENERAL MOTORS CORP.
  24. Remove the master cylinder nuts.
  25. Position the master cylinder to the engine. Hold the master cylinder in place using mechanic's wire.
    26. Fig 10: View Of Fuel Feed Line & Evaporative Emission (EVAP) Line
    GM1551868Courtesy of GENERAL MOTORS CORP.
  26. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (Without CH 48027) or Fuel Pressure Relief (With CH 48027) .
  27. Disconnect the fuel feed line (1) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  28. Disconnect the evaporative emission (EVAP) line (2) from the purge solenoid. Refer to Plastic Collar Quick Connect Fitting Service .
    29. Fig 11: View Of Bussed Electrical Center (BEC) Cover & Fuse Block
    GM1561307Courtesy of GENERAL MOTORS CORP.
  29. Remove the right front fender diagonal brace. Refer to FRONT FENDER UPPER DIAGONAL BRACE REPLACEMENT .
  30. Remove the underhood electrical center cover (1).
  31. Loosen the 4 integral bolts (2) attaching the fuse block. Reposition the fuse block.
    32. Fig 12: Engine Harness Connector & Bolt
    GM1561310Courtesy of GENERAL MOTORS CORP.
  32. Loosen the engine harness connector bolt (1). Remove the engine harness connector from the bracket.
    33. Fig 13: Camshaft Position (CMP) Sensor Electrical Connector
    GM1554556Courtesy of GENERAL MOTORS CORP.
  33. Disconnect the camshaft position sensor lead.
    34. Fig 14: Engine Harness Electrical Connector At The ABS Module
    GM1561314Courtesy of GENERAL MOTORS CORP.
  34. Disconnect the engine harness electrical connector from the ABS module.
    35. Fig 15: Engine Harness Electrical Connector & The Electronic Brake Control Module (EBCM)
    GM1561316Courtesy of GENERAL MOTORS CORP.
  35. Disconnect the engine harness electrical connector from the electronic brake control module (EBCM).
    36. Fig 16: Transmission Control Module, Engine Control Module & A/C Pressure Sensor Electrical Connectors
    GM1561318Courtesy of GENERAL MOTORS CORP.
  36. Remove the air cleaner assembly. Refer to Air Cleaner Element Replacement .
  37. Disconnect the following electrical connectors:
    • Transmission control module (TCM) (1)
    • Engine control module (ECM) (2)
    • A/C pressure sensor (3)
    38. Fig 17: Crankshaft Position (CKP) Sensor Harness & Power Steering Gear Harness To Engine Harness Electrical Connectors
    GM1561321Courtesy of GENERAL MOTORS CORP.
  38. Disconnect the engine harness electrical connector (1) from the crankshaft position (CKP) sensor harness.
  39. Disconnect the engine harness electrical connector (2) from the power steering gear harness.
  40. Remove the clip attaching the power steering gear harness to the bracket.
    41. Fig 18: View Of Shift Cable At Transaxle
    GM1561282Courtesy of GENERAL MOTORS CORP.
  41. Remove the shift cable clip.
  42. Disconnect the shift cable from the transaxle selector lever stud.
  43. Remove the shift cable from the bracket.
    44. Fig 19: Vehicle Speed Sensor (VSS) Shield, Nut & Bolt
    GM1561324Courtesy of GENERAL MOTORS CORP.
  44. Remove the vehicle speed sensor (VSS) shield nut (1) and bolt (3). Remove the shield (2).
    45. Fig 20: Engine Wiring Harness Routing
    GM1561325Courtesy of GENERAL MOTORS CORP.
  45. Disconnect the engine harness electrical connector from the VSS.
  46. Set all branches of the engine wiring harness on top of the engine.
    47. Fig 21: Intermediate Shaft, Bolt & Steering Gear
    GM1561276Courtesy of GENERAL MOTORS CORP.
  47. Reposition the intermediate shaft lower boot.
  48. Remove the intermediate shaft to steering gear bolt.
  49. Separate the intermediate shaft from the steering gear.
  50. Disconnect both front wheel speed sensors. Refer to Front Wheel Bearing and Hub Replacement .
  51. Unclip the ABS wire harness from the lower control arm.
    52. Fig 22: Heater Inlet & Outlet Hoses
    GM1561305Courtesy of GENERAL MOTORS CORP.
  52. Using the J 38185  reposition the heater inlet and outlet hose clamps. See Special Tools .
  53. Remove the heater inlet (2) and outlet (1) hoses from the heater inlet/outlet pipe.
  54. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  55. Disconnect the stabilizer links from the stabilizer shaft.
  56. Disconnect the ball joints from the steering knuckles. Refer to Lower Control Arm Ball Joint Replacement .
  57. Disconnect the power steering pressure hose from the steering gear.
  58. Disconnect the power steering pressure line clips from the frame.
  59. Disconnect the outer tie rod ends from the steering knuckles. Refer to Steering Linkage Outer Tie Rod Replacement .
    60. Fig 23: View Of Power Steering Hose & Inlet Pipe
    GM1561279Courtesy of GENERAL MOTORS CORP.
  60. Loosen the power steering hose clamp at the inlet pipe.
  61. Remove the power steering hose (2) from the inlet pipe.
  62. Remove the left and right wheel drive shafts from the transaxle. Refer to Wheel Drive Shaft Replacement .
  63. Support the wheel drive shafts using mechanic's wire.
    64. Fig 24: View Of Transaxle Oil Cooler Lines
    GM1561300Courtesy of GENERAL MOTORS CORP.
  64. Remove the transaxle oil cooler line bracket bolt/stud.
  65. Disconnect the transaxle oil cooler lines from the transaxle. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
    66. Fig 25: Battery Positive & Negative Cables
    GM1552773Courtesy of GENERAL MOTORS CORP.
  66. Remove the positive battery cable nut (3) from the starter.
  67. Remove the cable terminal (2) from the starter.
  68. Remove the battery cable ground nut (1).
  69. Remove the cable ground terminal (6) from the stud.
    70. Fig 26: Battery Cable Retainers
    GM1552771Courtesy of GENERAL MOTORS CORP.
  70. Remove the battery cable retainers from the engine frame.
  71. Disconnect the exhaust system. Refer to Catalytic Converter Replacement (LS4) .
  72. Disconnect the O2 sensor harness pigtail.
    73. Fig 27: View Of Transaxle Converter Cover & Bolt/Stud
    GM1561287Courtesy of GENERAL MOTORS CORP.
  73. Remove the transaxle converter cover bolt/stud.
  74. Remove the converter cover.
    75. Fig 28: View Of Flywheel Bolts
    GM1561291Courtesy of GENERAL MOTORS CORP.
  75. Remove the flywheel bolts.
  76. Remove the front air deflectors. Refer to Radiator Air Lower Baffle and Deflector Replacement .
    77. Fig 29: Identifying Utility Stand
    GM333118Courtesy of GENERAL MOTORS CORP.
  77. Raise the vehicle enough to place J 39580  under the engine, frame, and front suspension.
  78. Support the rear of the vehicle with suitable jackstand.
  79. Strap the front of the vehicle to the hoist.
  80. Raise the J 39580  , or lower the vehicle to preload the weight of the engine, frame, and front suspension.
  81. Remove the radiator to frame brackets.
    82. Fig 30: View Of Engine Frame Front Bolts
    GM1561294Courtesy of GENERAL MOTORS CORP.
  82. Remove the engine frame front bolts.
    83. Fig 31: View Of Engine Frame Rear Bolts
    GM1561297Courtesy of GENERAL MOTORS CORP.
  83. Remove the engine frame rear bolts.
  84. With the aid of an assistant, lower the J 39580  and/or raise the vehicle to remove the engine and the frame from the vehicle.
  85. Ensure that all hoses, wires, and pipes clear the vehicle during the removal process.
  86. Use a suitable engine lift to support the engine.
    87. Fig 32: View Of Lower Engine Mount
    GM1551858Courtesy of GENERAL MOTORS CORP.
  87. Remove the front engine mount to frame nuts.
    88. Fig 33: View Of Engine Mount Bracket Nuts
    GM1551859Courtesy of GENERAL MOTORS CORP.
  88. Remove the rear engine mount to frame nuts.
    89. Fig 34: View Of Transaxle To Engine Bolts & Stud
    GM1561328Courtesy of GENERAL MOTORS CORP.
  89. Remove the transaxle to engine bolts (1) and stud (2).
  90. Separate the engine from the transaxle.
  91. Using a suitable engine lift, remove the engine from the frame.
  92. Install the engine onto a suitable engine stand.
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