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Home >> Cadillac >> 2009 >> STS AWD V6-3.6L >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Service and Repair >> Removal and Replacement >> Engine Replacement >> Part 1

Part 1




Engine Replacement

Special Tools
* EN 46114 Engine Lift Brackets
* J 42640 Steering Column Anti-Rotation Pin

Removal Procedure

1. Center the steering wheel.
2. Turn the ignition OFF.




3. Install J 42640 to the steering column.





Note: Do NOT disconnect the battery cables from the engine.

4. Disconnect the negative cable from the battery and the body. Refer to Battery Negative Cable Replacement (LH2 with Top Post) (Service and Repair)Battery Negative Cable Replacement (LC3) (Service and Repair)Battery Negative Cable Replacement (LH2 With Side Post) (Service and Repair)Battery Negative Cable Replacement (LLT With Top Post) (Service and Repair)Battery Negative Cable Replacement (LLT With Side Post) (Service and Repair).
5. Disconnect the positive cable from the battery and the underhood electrical center. Refer to Battery Positive Cable Replacement (LH2 With Top Post) (Service and Repair)Battery Positive Cable Replacement (LH2 With Side Post) (Service and Repair)Battery Positive Cable Replacement (LLT With Top Post) (Service and Repair)Battery Positive Cable Replacement (LLT With Side Post) (Service and Repair)Battery Positive Cable Replacement (LC3) (Service and Repair).
6. Position and secure the battery cables to the engine.
7. Remove the battery. Refer to Battery Replacement (Side Post) (Battery Replacement (Side Post))Battery Replacement (Top Post) (Battery Replacement (Top Post)).
8. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (LP1, LY7) (Service and Repair)Fuel Injector Sight Shield Replacement (LLT) (Service and Repair).




9. Remove the air cleaner duct. Refer to Air Cleaner Inlet Duct Replacement (Service and Repair).




10. Disconnect the cooling fan electrical connectors (2, 3).
11. Remove the cooling fan wiring harnesses (1, 4) from the fan shroud.
12. Secure the wiring harnesses to the vehicle.
13. Drain the cooling system. Refer to Cooling System Draining and Filling (GE 47716) (Service and Repair)Cooling System Draining and Filling (Static Fill) (Service and Repair).

Note: Do NOT disconnect the surge hoses from the engine or the radiator.

14. Disconnect the surge tank outlet hose from the surge tank. Refer to Radiator Surge Tank Inlet Hose/Pipe Replacement (LY7) (Service and Repair)Radiator Surge Tank Inlet Hose/Pipe Replacement (LLT) (Service and Repair)Radiator Surge Tank Inlet Hose/Pipe Replacement (LH2) (Service and Repair).
15. Position and secure the surge hose to the engine.
16. Disconnect the surge tank inlet hose from the water outlet housing and the radiator. Refer to Radiator Surge Tank Outlet Hose/Pipe Replacement (LH2, LC3) (Service and Repair)Radiator Surge Tank Outlet Hose/Pipe Replacement (LY7) (Service and Repair).
17. Position and secure the surge tank inlet hose to the vehicle.
18. Disconnect the heater hoses from the heater core. Refer to Heater Inlet Hose Replacement (LH2) (Service and Repair)Heater Inlet Hose Replacement (LY7) (Service and Repair) and to Heater Outlet Hose Replacement (LH2) (Service and Repair)Heater Outlet Hose Replacement (LY7) (Service and Repair).




19. Disconnect the purge line (3) from the purge solenoid.
20. Disconnect the fuel pipe (2) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service (Metal Collar Quick Connect Fitting Service).
21. Plug the fuel pipe and cap the fuel rail to prevent fuel loss or contamination.
22. Evacuate the air conditioning system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
23. Remove the windshield wiper transmission. Refer to Windshield Wiper Transmission Replacement (Service and Repair).

Note: Do NOT disconnect the suction hose from the A/C compressor.

24. Disconnect the air conditioning suction hose from the evaporator and remove the suction hose bracket from the shock tower. Refer to Suction Hose Replacement (LY7) (Service and Repair)Suction Hose Replacement (LH2) (Service and Repair).
25. Position and secure the suction hose to the engine.

Note: Do NOT disconnect the liquid line from the condenser.

26. Disconnect the air conditioning pressure switch electrical connector and remove the liquid line. Refer to Air Conditioning Condenser and Air Conditioning Evaporator Tube Replacement (LY7/LLT) (Service and Repair)Air Conditioning Condenser and Air Conditioning Evaporator Tube Replacement (LH2) (Service and Repair).




27. Remove the radiator support bolts.
28. Remove the radiator support brackets.




29. Disconnect the brake booster check valve and vacuum hose (1) from the brake booster (2).
30. Position and secure the brake booster hose to the engine.
31. Disconnect the electrical connector to the brake fluid level switch from the master cylinder.
32. Disconnect the electrical connector to the mass air flow sensor.
33. Unlock and disconnect the instrument panel (I/P) electrical connector from the engine located at the rear of the left bank 2 cylinder head.
34. Position and secure the I/P harness to the vehicle.




35. Disconnect the engine module wiring harness connectors (1-3) from the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement (Service and Repair).
36. Disconnect the wiring harness from the transmission control module (TCM).




37. Remove the ground bolt and wire from the longitudinal rail.




38. Unlock and disconnect the front engine wiring harness electrical connector from the engine control module (ECM).




39. Unlock and disconnect the rear engine wiring harness electrical connector from the ECM.




40. Disconnect the engine harness electrical connector at the longitudinal rail.
41. Position and secure the ground wire, the engine harness and the TCM harness to the engine.





Note: Do NOT disconnect the brake pipes from the master cylinder.

42. Remove the master cylinder nuts.
43. Reposition and secure the master cylinder to the engine.
44. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (With High Pressure Pump - LLT) (Service and Repair)Fuel Pressure Relief (With CH 48027 - LP1, LY7) (Service and Repair)Fuel Pressure Relief (Without CH 48027 - LY7) (Service and Repair).
45. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
46. Remove the muffler assembly. Refer to Exhaust System Replacement (Service and Repair).
47. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement (All Wheel Drive) (Service and Repair)Rear Propeller Shaft Replacement (Rear Wheel Drive) (Service and Repair).
48. Remove the air deflector. Refer to Front Air Deflector Replacement (Front Air Deflector Replacement).

Note: DO NOT remove the water bottle.

49. Remove the washer bottle bracket. Refer to Windshield Washer Solvent Container Replacement (With CE4) (Service and Repair)Windshield Washer Solvent Container Replacement (Without CE4) (Service and Repair).
50. Disconnect the side air baffles from the radiator.
51. Disconnect the left front brake pipe retainer along with the brake pipe from the longitudinal rail.
52. Remove the right front brake pipe from the brake pipe bundle retainer.
53. Disconnect the rear brake pipes from the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve Replacement (Service and Repair).
54. Plug the brake pipes and the brake modulator valve in order to minimize brake fluid loss.
55. Remove the front tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation (Service and Repair).
56. Remove the lower intermediate steering shaft. Refer to Lower Intermediate Steering Shaft Replacement (without JL7) (Lower Intermediate Steering Shaft Replacement (without JL7))Lower Intermediate Steering Shaft Replacement (With JL7) (Lower Intermediate Steering Shaft Replacement (With JL7)).




57. Remove the lower engine mount nuts. Refer to Engine Mount Replacement - Left Side (Service and Repair) and to Engine Mount Replacement - Right Side (Service and Repair).




58. Disconnect the transmission shift linkage from the transmission.
59. Disconnect the electrical connector to the low oil level sensor.
Secure the electrical connector and the harness to the engine mount bracket.
60. Remove the headlamp leveling sensors. Refer to Headlamp Leveling Front Suspension Height Sensor Replacement (Headlamp Leveling Front Suspension Height Sensor Replacement).
61. Secure the shock modules to the lower control arms with a suitable strap in order to prevent damage to the front brake hoses.




62. Remove the upper mounting bolts from the right and left shock module. Refer to Shock Absorber and Spring Assembly Replacement (Shock Absorber and Spring Assembly Replacement).
63. Raise the vehicle enough to place a suitable lift table under the engine, transmission, front frame and front suspension assembly.
64. Position a suitable powertrain or engine lift table below the frame, engine and transmission.
65. Raise the lift table or lower the vehicle to support the frame, engine and transmission.
66. Remove the bolts which secure the transmission brace to the underbody. Refer to Transmission Support Replacement (Transmission Support Replacement).




67. Remove the front frame bolts (2).

Note: Ensure that all the hoses, wires, pipes and shock modules clear the vehicle during the removal process.

68. With the aid of an assistant, lower the table or raise the vehicle to remove the engine, transmission, front frame and front suspension assembly from the vehicle.

Note: Do NOT remove the oxygen sensors.


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