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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Mechanical - 3.9L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: The front wheels of the vehicle must be maintained in the straight ahead position and the steering column must be in the LOCK position before disconnecting the steering column or intermediate shaft. Failure to follow these procedures will cause improper alignment of some components during installation and result in damage to the SIR coil assembly.
    Fig 1: Identifying J 42640
    GM333146Courtesy of GENERAL MOTORS CORP.
  1. Lock the steering column by installing the J 42640  into the underside of the steering column.
  2. Open the hood.
  3. Remove the engine oil fill cap.
  4. Pull up on the intake manifold cover in order to disengage the cover from the studs.
  5. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .
  6. Disconnect the positive battery cable.
  7. Disconnect the battery current sensor. Refer to BATTERY CURRENT SENSOR REPLACEMENT .
  8. Disconnect the auxiliary ground cable on the inner fender.
  9. Disconnect the positive battery feed at the junction box.
  10. Remove the lower radiator air baffle. Refer to RADIATOR AIR BAFFLE ASSEMBLIES AND DEFLECTORS .
  11. Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM (STATIC FILL) .
  12. Lower the vehicle.
    13. Fig 2: View Of Coolant Crossover Pipe
    GM1679795Courtesy of GENERAL MOTORS CORP.
  13. Reposition the coolant recovery reservoir hose clamp (1) at the coolant crossover.
  14. Remove the coolant recovery reservoir hose (2) from the crossover.
  15. Remove the coolant reservoir. Refer to COOLANT RECOVERY RESERVOIR REPLACEMENT .
  16. Remove the left side diagonal brace. Refer to BRACE REPLACEMENT - SHEET METAL DIAGONAL .
    17. Fig 3: View Of Junction Block Cover
    GM1679797Courtesy of GENERAL MOTORS CORP.
  17. Unsnap and remove the junction block cover.
    18. Fig 4: View Of Air Cleaner Cover
    GM1679799Courtesy of GENERAL MOTORS CORP.
  18. Loosen the air cleaner cover bolts. .
  19. Remove the air cleaner cover.
    20. Fig 5: View Of Engine Control Module (ECM) & Air Cleaner Cover
    GM1679802Courtesy of GENERAL MOTORS CORP.
  20. Remove the engine control module (ECM) from the air cleaner cover.
  21. Disconnect the engine harness electrical connector (1) from the transaxle control module (TCM).
  22. Disconnect the engine harness electrical connector (3) from the instrument panel (I/P) harness electrical connector (2).
  23. Disconnect the engine harness electrical connector (5) from the I/P harness electrical connector (4).
  24. Disconnect the engine harness electrical connector (6) from the ABS module.
    25. Fig 6: Identifying Engine Harness Clip At A/C Line
    GM1679803Courtesy of GENERAL MOTORS CORP.
  25. Remove the engine harness clip (1) from the air conditioning (A/C) line.
    26. Fig 7: View Of Engine Harness Clip At A/C Line
    GM1679804Courtesy of GENERAL MOTORS CORP.
  26. Remove the engine harness clip (1) from the A/C line.
  27. Remove the underhood junction. Refer to UNDERHOOD ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT .
    28. Fig 8: Identifying Engine Harness connector At junction block.
    GM1679798Courtesy of GENERAL MOTORS CORP.
  28. Unsnap and remove the engine harness connector from the junction block retainer.
    29. Fig 9: Identifying Engine Harness connector At Mass Air Flow (MAF)/intake Air Temperature (IAT) Sensor
    GM1677915Courtesy of GENERAL MOTORS CORP.
  29. Disconnect the engine harness electrical connector from the mass air flow (MAF)/intake air temperature (IAT) sensor.
  30. Disconnect the positive crankcase ventilation (PCV) fresh air tube quick connect fitting from the air cleaner outlet duct.
  31. Loosen the air cleaner outlet duct clamps at the throttle body and the MAF/IAT sensor.
  32. Remove the air cleaner outlet duct from the throttle body and MAF/IAT sensor.
  33. Gather the outer branches of the engine harness and lay them on top of the engine.
    34. Fig 10: View Of Radiator, Inlet Hose & Coolant Recovery Reservoir Inlet Hose
    GM1677950Courtesy of GENERAL MOTORS CORP.
  34. Using the J 38185 , release the tension on the radiator inlet hose clamp and reposition the clamp.
  35. Remove the radiator inlet hose from the coolant crossover.
    36. Fig 11: View Of Radiator Outlet Hose
    GM1677957Courtesy of GENERAL MOTORS CORP.
  36. Using the J 38185 , release the tension on the radiator outlet hose clamp and reposition the clamp.
  37. Remove the radiator outlet hose from the thermostat housing.
    38. Fig 12: View Of Heater Hoses
    GM1677962Courtesy of GENERAL MOTORS CORP.
  38. Disconnect the heater inlet (2) and outlet (1) hose quick connect fittings from the inlet and outlet pipes.
    39. Fig 13: View Of Booster Vacuum Hose
    GM1677963Courtesy of GENERAL MOTORS CORP.
  39. Remove the brake booster vacuum hose from the upper intake manifold fitting.
    40. Fig 14: Identifying Fuel Feed & Evaporative Emission (EVAP) Line Quick Connect Fittings
    GM1677966Courtesy of GENERAL MOTORS CORP.
  40. Disconnect the fuel feed (1) and evaporative emission (EVAP) (2) line quick connect fittings. Refer to METAL COLLAR QUICK CONNECT FITTING SERVICE or PLASTIC COLLAR QUICK CONNECT FITTING SERVICE .
  41. Remove the engine mount struts. Refer to Engine Mount Strut Replacement - Left  and Engine Mount Strut Replacement - Right .
  42. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .
  43. Remove the front wheels and tires. Refer to Tire and Wheel Removal and Installation .
  44. Remove rear propeller shaft, if equipped with all wheel drive (AWD). Refer to PROPELLER SHAFT REPLACEMENT .
    45. Fig 15: Identifying Engine Harness Electrical Connectors Located At Left & Right Wheel Speed Sensors
    GM1679800Courtesy of GENERAL MOTORS CORP.
  45. Disconnect the engine harness electrical connectors (1) from the left and right wheel speed sensors. (right side shown, left side similar).
  46. Remove the drive belt. Refer to Drive Belt Replacement .
    47. Fig 16: Identifying A/C Compressor Front Bolt & Nut
    GM1675217Courtesy of GENERAL MOTORS CORP.
  47. Disconnect the engine harness electrical connectors from the A/C compressor.
    48. IMPORTANT: It is not necessary to evacuate the A/C system prior to repositioning the A/C compressor.
  48. Remove the A/C compressor front bolt and nut.
    49. Fig 17: Identifying A/C Compressor Front Bolt & Nut
    GM1675218Courtesy of GENERAL MOTORS CORP.
  49. Remove the A/C compressor rear bolt. Reposition and support the A/C compressor out of the way.
  50. Remove the catalytic converter. Refer to CATALYTIC CONVERTER REPLACEMENT .
  51. Remove the engine splash shield. Refer to Splash Shield Replacement - Engine .
  52. Remove the engine harness clips (1, 2) from the catalytic converter heat shield, if equipped with AWD.
  53. Disconnect the battery cable retainers at the core support.
    54. Fig 18: Identifying Engine Harness Clips At Heat Shield
    GM1679941Courtesy of GENERAL MOTORS CORP.
  54. Remove the engine harness clips (1, 2) from the heat shield, if equipped with front wheel drive (FWD).
    55. Fig 19: Identifying Stabilizer Shaft Components
    GM1544893Courtesy of GENERAL MOTORS CORP.
  55. If equipped with FWD, remove the stabilizer shaft link lower nuts (3). (left side shown, right side similar)
  56. Remove the stabilizer shaft links (2) from the stabilizer shaft.
    57. Fig 20: Identifying Tie Rod End Nuts
    GM1678394Courtesy of GENERAL MOTORS CORP.
  57. Remove the tie rod end nuts (1) at the steering knuckles. (FWD shown, AWD similar).
    58. NOTE: Do not attempt to free the ball stud by using a pickle fork or wedge type tool, because seal or bushing damage could result. Use the proper tool to separate all ball joints.
    Fig 21: View Of Outer Tie Rod Ends & Steering Knuckles
    GM1677211Courtesy of GENERAL MOTORS CORP.
  58. Using the J 24319-B, separate the outer tie rod ends from the steering knuckle.
  59. Remove the lower ball joint cotter pins (2) from the ball joints.
  60. Loosen the lower ball joint castle nuts (1).
    61. Fig 22: Separating Ball Stud From Steering Knuckle
    GM378908Courtesy of GENERAL MOTORS CORP.
    NOTE: Use only the recommended tools for separating the ball joint from the knuckle. Do NOT hammer or pry the ball joint from the knuckle. Failure to use the recommended tools may cause damage to the ball joint and seal.
  61. Install the J 41820 over the ball joint and lower control arm as shown.
  62. Rotate the castle nut counterclockwise in order to separate the ball joint from the steering knuckle.
  63. Assemble the J 33008-A, J 29794  and the J 2619-O1  .
    64. Fig 23: Identifying Wheel Drive Shafts
    GM1679243Courtesy of GENERAL MOTORS CORP.
  64. Using the J 33008-A, J 29794  and the J 2619-O1  , disengage the wheel drive shafts from the transaxle. (left side shown, right side similar).
  65. Secure the wheel drive shafts to the steering knuckle/struts.
    66. CAUTION: Failure to disconnect the intermediate shaft from the rack and pinion steering gear stub shaft can result in damage to the steering gear and/or intermediate shaft. This damage may cause loss of steering control which could result in an accident and possible personal injury.
    Fig 24: Identifying Wheel Intermediate Steering Shaft & Pinch Bolt
    GM1679186Courtesy of GENERAL MOTORS CORP.
  66. Reposition the intermediate steering shaft seal in order to provide access to the intermediate steering shaft pinch bolt.
  67. Remove the intermediate steering shaft pinch bolt.
  68. Disconnect the intermediate steering shaft from the power steering gear.
    69. Fig 25: Identifying Utility Stand
    GM333118Courtesy of GENERAL MOTORS CORP.
  69. Place the J 39580  under the frame.
  70. Lower the vehicle until the frame contacts the J 39580  .
    71. Fig 26: Identifying Frame Bolts
    GM1677195Courtesy of GENERAL MOTORS CORP.
  71. Remove the front and rear frame bolts (1, 2).
    72. Fig 27: Identifying Frame Bolts
    GM1679266Courtesy of GENERAL MOTORS CORP.
  72. Remove the frame rear strap bolts (2, 3).
  73. Remove the frame rear straps (1, 4).
  74. Raise the vehicle in order to separate the powertrain/frame assembly from the vehicle.
    75. Fig 28: Identifying Engine Harness Ground Wire Nut
    GM1679831Courtesy of GENERAL MOTORS CORP.
  75. If necessary perform the following steps, remove the engine harness ground wire nut (1).
  76. Remove the engine harness positive battery cable (2) from the stud.
  77. Disconnect the engine harness electrical connector (3) from the starter.
    78. Fig 29: Identifying Engine Harness Ground Nuts
    GM1679875Courtesy of GENERAL MOTORS CORP.
  78. Remove the engine harness ground nuts (1, 2) from the transaxle studs.
  79. Remove the engine harness grounds from the studs.
  80. Remove the negative battery cable from the transaxle stud.
    81. Fig 30: Identifying Engine Transaxle Brace
    GM1677238Courtesy of GENERAL MOTORS CORP.
  81. Remove the engine to transaxle brace .
    82. Fig 31: Identifying Starter Motor & Bolts
    GM1679421Courtesy of GENERAL MOTORS CORP.
  82. Remove the starter motor bolts and starter.
    83. Fig 32: Identifying Torque Converter Cover & Bolts
    GM1679424Courtesy of GENERAL MOTORS CORP.
  83. Remove the torque converter cover bolts (1, 3).
  84. Remove the torque converter covers (2, 4).
    85. Fig 33: Holding Flywheel
    GM309963Courtesy of GENERAL MOTORS CORP.
  85. Use the J 37096  in order to hold the flywheel and also rotate the flywheel to access the torque converter bolts.
    86. Fig 34: Identifying Torque Converter Bolts
    GM1679504Courtesy of GENERAL MOTORS CORP.
  86. Remove the torque converter bolts.
  87. Remove the engine mount to frame nuts.
    88. Fig 35: Identifying Engine Harness Clips At Transaxle Brace
    GM1679947Courtesy of GENERAL MOTORS CORP.
  88. Remove the engine harness clips (1) from the transaxle brace.
    89. Fig 36: Identifying Engine Harness Clips At Transaxle Brace
    GM1679949Courtesy of GENERAL MOTORS CORP.
  89. Remove the engine harness clips (1) from the transaxle brace.
    90. Fig 37: View Of Engine Harness Clips
    GM1677237Courtesy of GENERAL MOTORS CORP.
  90. Remove the engine harness clips (1) from the transaxle brace.
    91. Fig 38: Identifying Exhaust Manifold Heat Shield & Bolts - Left
    GM1679427Courtesy of GENERAL MOTORS CORP.
  91. Remove the exhaust crossover pipe shield bolts (1) and shield (2).
    92. Fig 39: Identifying Exhaust Crossover Pipe Shield & Bolts
    GM1679429Courtesy of GENERAL MOTORS CORP.
  92. Remove the exhaust crossover pipe nuts (1) and pipe (2).
    93. Fig 40: Locating EVAP & ETC Electrical Connectors
    GM1675738Courtesy of GENERAL MOTORS CORP.
  93. Disconnect the engine harness electrical connector (1) from the EVAP purge solenoid.
  94. Disconnect the engine harness electrical connector (2) from the throttle actuator.
    95. Fig 41: Locating MAP Sensor Electrical Connector
    GM1675732Courtesy of GENERAL MOTORS CORP.
  95. Disconnect the engine harness electrical connector (1) from the manifold absolute pressure (MAP) sensor.
  96. Disconnect the engine harness electrical connector (2) from the ignition coil.
    97. Fig 42: View Of Engine Harness At Ignition Coil Bracket
    GM1679957Courtesy of GENERAL MOTORS CORP.
  97. Remove the engine harness clip (1) from the ignition coil bracket.
    98. Fig 43: Identifying Engine Harness At Ignition Coil Bracket
    GM1679943Courtesy of GENERAL MOTORS CORP.
  98. Remove the engine harness clip (1) from the ignition coil bracket.
    99. Fig 44: Locating Engine Harness Electrical Connector
    GM1677450Courtesy of GENERAL MOTORS CORP.
  99. Remove the engine harness clip from the engine.
  100. Remove the engine harness bolt.
  101. Disconnect the engine harness electrical connector from the camshaft actuator magnet.
    102. Fig 45: Locating Engine Harness Bracket Nut
    GM1679951Courtesy of GENERAL MOTORS CORP.
  102. Remove the engine harness bracket nut (1).
  103. Remove the engine harness bracket (2) from the stud.
    104. Fig 46: View Of Engine Harness Clip At Bracket
    GM1679954Courtesy of GENERAL MOTORS CORP.
  104. Remove the engine harness clip (1) from the bracket.
    105. Fig 47: Identifying Engine Harness electrical Connector
    GM1675736Courtesy of GENERAL MOTORS CORP.
  105. Disconnect the engine harness electrical connector (1) from the intake manifold tuning valve.
  106. Remove the connector position assurance (CPA) retainer (2).
  107. Disconnect the engine harness electrical connector (3) from the fuel injector harness electrical connector.
    108. Fig 48: View Of Rear Of Generator
    GM1679874Courtesy of GENERAL MOTORS CORP.
  108. Remove the generator terminal nut (1).
  109. Remove the engine harness lead (2) from the generator.
  110. Disconnect the engine harness electrical connector (3) from the generator.
  111. Disconnect the engine harness electrical connector (4) from the heated oxygen sensor (HO2S).
    112. Fig 49: Identifying Engine Harness Clip
    GM1675191Courtesy of GENERAL MOTORS CORP.
  112. Remove the engine harness clip (1) from the strut bracket.
    113. Fig 50: Identifying Engine Harness connector At Crankshaft Position (CKP) Sensor
    GM1679872Courtesy of GENERAL MOTORS CORP.
  113. Disconnect the engine harness electrical connector (1) from the crankshaft position (CKP) sensor.
    114. Fig 51: Identifying Oil Pressure Sensor & Knock Sensor Electrical Connectors
    GM1675553Courtesy of GENERAL MOTORS CORP.
  114. Disconnect the engine harness electrical connector (1) from the knock sensor.
  115. Disconnect the engine harness electrical connector (2) from the oil pressure sensor.
    116. Fig 52: Identifying Engine Harness Connector At Transaxle
    GM1679878Courtesy of GENERAL MOTORS CORP.
  116. Disconnect the engine harness electrical connector from the transaxle.
    117. Fig 53: Identifying Engine Harness connector At Vehicle Speed Sensor (VSS)
    GM1679901Courtesy of GENERAL MOTORS CORP.
  117. Disconnect the engine harness electrical connector from the vehicle speed sensor (VSS).
    118. Fig 54: Identifying Engine Harness Clip Studs
    GM1679962Courtesy of GENERAL MOTORS CORP.
  118. Remove the engine harness clip (1) from the stud on the transaxle.
    119. Fig 55: Identifying Engine Harness Clamp Bolts
    GM1679958Courtesy of GENERAL MOTORS CORP.
  119. Remove the engine harness clamp bolt from the transaxle.
    120. Fig 56: Identifying Engine Harness, Clips & Transaxle Studs
    GM1679961Courtesy of GENERAL MOTORS CORP.
  120. Remove the engine harness clips (1) from the transaxle studs.
    121. Fig 57: Identifying Engine Harness & Clips
    GM1677214Courtesy of GENERAL MOTORS CORP.
  121. Disconnect the engine harness electrical connector from the oil level sensor.
    122. Fig 58: Installing Engine Harness & Clips
    GM1677212Courtesy of GENERAL MOTORS CORP.
  122. Remove the engine harness clip from the oil pan.
  123. Gather all branches of the engine harness together and remove the engine harness from the engine.
  124. Disconnect the power steering line retainer from the generator bracket.
  125. Remove the power steering pressure pipe and return line from the power steering pump and position out of the way. Refer to POWER STEERING PRESSURE PIPE/HOSE REPLACEMENT .
    126. Fig 59: Installing Engine Hoist
    GM1679543Courtesy of GENERAL MOTORS CORP.
  126. Install an engine hoist to the engine.
  127. Remove the transaxle bolts and studs.
  128. Support the transaxle.
  129. Separate and remove the engine from the transaxle and the frame.
    130. Fig 60: Holding Flywheel
    GM309963Courtesy of GENERAL MOTORS CORP.
  130. Use the J 37096  in order to hold the flywheel.
    131. Fig 61: View Of Flywheel
    GM1526753Courtesy of GENERAL MOTORS CORP.
  131. Loosen the flywheel bolts.
  132. Remove 5 of the 6 flywheel bolts leaving one bolt at the top of the crankshaft.
  133. Grip the flywheel and remove the remaining bolt. Do not drop the flywheel when removing the final bolt.
  134. Remove the engine flywheel.
  135. Install the engine to the engine stand.
  136. Remove the engine hoist from the engine.
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