Service Procedure

Engine Inspection Procedure

Tools Required

^ J 28467-B Engine Support Fixture

^ J 36660 Electronic Torque/Angle Meter

1. Prep the vehicle prior to electrical disconnection. Any customized settings should be recorded. These settings include:

^ Record customer's radio station settings.

^ Theft-lock number

3. For Aurora and Seville vehicles only, remove the rear seat lower cushion.

4. Disconnect the ground (negative) battery cable.





5. Remove the fuel injector sight shield.





6. For DeVille and Eldorado vehicles only, remove the right and the left torque struts and the bolts/nuts.





7. For DeVille and Eldorado vehicles only, reinstall the bolt and the nut in the right engine strut bracket.

8. For DeVille and Eldorado vehicles only, remove the strut tower-to-tower brace and the nuts.

9. For DeVille and Eldorado vehicles only, reinstall the strut tower-to-tower bracket nuts.

10. For Seville vehicles only, disconnect the hood lamp harness from the stepper motor stud.

11. For Aurora vehicles only, disconnect the front wiring harness from the harness interface.

12. For Aurora vehicles only, disconnect the wiring harness connector from the stepper motor.

13. For Aurora vehicles only, disconnect the cruise cable from the stepper motor.

14. For Aurora and Seville vehicles only, remove the stepper motor and the nuts. Set the motor and nuts aside.

15. Disconnect the ignition control module assembly wiring harness connectors.

16. Disconnect the four center coil wires from the ignition control module assembly.

17. Remove the ignition control module assembly bolts.

18. Place the ignition control module assembly forward for access to the right side spark plug wires.

19. Disconnect the right side spark plug wires.

20. For Aurora and Seville vehicles only, remove the push retainer from the driver's side rear fuel injector sight shield stud.

21. For Aurora and Seville vehicles only, remove the front spark plug wire harness retainer from the driver's side rear fuel injector sight shield stud.

22. Set aside the ignition control module assembly and the spark plug wires.

23. Disconnect the EVAP solenoid wiring harness connector.

24. Remove the EVAP solenoid bracket bolt.

25. For Aurora and Seville vehicles only, disconnect the EVAP tube from the intake manifold.

26. Set aside the EVAP solenoid and tubing.

27. Disconnect the PCV valve and the tubing. Set the valve and the tubing aside.

28. Disconnect the oxygen sensor wiring harness connector.

29. For Seville vehicles only, disconnect the oxygen sensor wiring harness retainer from the driver's side wiring harness retainer clip on the right camshaft cover.

30. For Aurora, DeVille and Eldorado vehicles only, disconnect the oxygen sensor wiring harness retainer from the center wiring harness retainer clip on the right camshaft cover.

31. Disconnect the wiring harness connector from the camshaft position sensor.

32. Disconnect the starter wiring harness connector.

33. Unlock the wiring harness retainer clip on the front of the right camshaft cover and remove the starter wiring harness.

34. Unlock the three wiring harness retainer clips across the back of the right camshaft cover and remove the engine wiring harness.

35. For DeVille and Eldorado vehicles only, install the J 28467-33 adapters on top of the strut tower-to-tower brace nuts.

36. For DeVille and Eldorado vehicles only, install both the J 28467-SA strut tower support assemblies over the J 28467-33 adapters.

37. For DeVille and Eldorado vehicles only, install the J 28467-33 wing nuts.

38. For DeVille and Eldorado vehicles only, install the J 28467-3 strut tower tube into the J 28467-5A strut tower support assemblies.

39. For DeVille and Eldorado vehicles only, install the left J 28467-2A tube and the J 28467-4A support over the left lift bracket.

40. For DeVille and Eldorado vehicles only, install the right J 28467-2A tube and the J 28467-4A support over the right engine strut bracket.

41. For DeVille and Eldorado vehicles only, install the J 28467-1A cross bracket assemblies on the left and the right J 28467-2A tube and the J 28467-3 strut tower tube.

42. For DeVille and Eldorado vehicles only, install the J 28467-6A lift hook bracket with the J 28467-7A lift hook and the J 28467-34 wing nut over each of the J 28467-2A tube and the J 28467-4A support assemblies.

43. For DeVille and Eldorado vehicles only, install the left J 28467-7A lift hook to the left engine bracket.

44. For DeVille and Eldorado vehicles only, install the right J 28467-7A lift hook to the right engine strut bracket bolt.

45. Raise and suitably support the vehicle.

46. For Aurora vehicles only, disconnect the wiring harness connector from the power steering pump pressure switch (PSP).

47. For Aurora vehicles only, disconnect the wiring harness connector from the variable steering actuator (VSA).

48. For Aurora, Eldorado and Seville vehicles only, disconnect the wiring harness connector from the vehicle speed sensor (VSS).

49. For Seville vehicles only, disconnect the wiring harness connector from the A/C switch.

50. For Eldorado and Seville vehicles only, disconnect the wiring harness retainer from the transmission brace.

51. For DeVille and Eldorado vehicles only, remove the frame-to-body deflector bolts.

52. For DeVille and Eldorado vehicles only, remove the frame-to-body deflector.

53. For Eldorado vehicles only, remove the left front splash shield retaining clips as necessary to access the left front frame cradle bolt.

54. For DeVille and Eldorado vehicles only, remove the left and the right front frame cradle bolts.





55. For DeVille and Eldorado vehicles only, remove the converter nuts at the exhaust manifold rear pipe.

56. For DeVille and Eldorado vehicles only, disconnect the exhaust manifold rear pipe at the converter. Position the converter out of the way.

57. Remove the support and lower the vehicle.

58. Position the engine wiring harness away from the right camshaft cover using tie straps.

59. For DeVille and Eldorado vehicles only, lower the front of the engine by turning the J 28467-34 wing nuts ten full turns.

60. Remove the wiring harness bolt/retainer(s) across the back of the right camshaft cover as necessary to access the camshaft cover bolts.

61. For DeVille and Eldorado vehicles only, remove the heater pipe clip retainer bolt(s) across the back of the right cylinder head as necessary to access the camshaft cover bolts.





62. Loosen the right camshaft cover bolts.

63. Remove the right camshaft cover.





64. Remove the inboard center cylinder head bolt (1).





65. Place the cylinder head bolt in the cylinder head bolt hole until the bolt contacts the top of the cylinder head bolt threads in the engine block.

66. Ensure that the cylinder head bolt washer is placed down at the cylinder head.





67. The illustration above is showing 6" steel ruler to measure the distance of the cylinder head bolt from the top surface of the cylinder head bolt head to the top surface of the cylinder head bolt washer (1).

68. Determine the cylinder head bolt shank measurement (2) by subtracting the cylinder head bolt head height (3) from the overall height (1) measured in Step 66.

69. If the distance is greater than 21 mm (0.827 in), this is a good engine and the vehicle can be released for sale if in dealer inventory or released back to the owner. Proceed to Step 70.

70. If the distance measures 21 mm (0.827 in) or less, the engine failed the inspection. For vehicles in dealer inventory, the engine must be reassembled and held for return to GM. Further return instructions will be provided. For customer vehicles only, remove and replace the engine.





71. Remove the cylinder head bolt out of the block.

A. Apply GM P/N 12345493, or the equivalent, completely around the cylinder head bolt threads in an area 12 to 19 mm (1/2 to 3/4 in) from the bottom of the bolt.

B. Reinstall the cylinder head bolt.

C. For engines passing the inspection and for failed engines in dealer inventory to be returned to GM, tighten the cylinder bolt using J 36660.

Tighten

^ Tighten to 30 Nm (22 lb-ft) for the first pass.

^ Tighten 180 degrees for the second pass.

Reassembly Procedure for Inspected Engines

Engine reassembly will be required for all engines passing inspection and also for engines failing inspection and in dealer inventory to be returned to GM.

Important:
Ensure the spark plug and the camshaft cover seals are not damaged or the seals were not pulled from their grooves in the camshaft cover during removal. Reuse the seals if undamaged.

1. Install the spark plug and camshaft cover seals as required. It is not necessary to install new seals on engines that are to be replaced.





2. Install the right camshaft cover.

3. Install the right camshaft cover bolts.

Tighten

Tighten the right camshaft cover bolts to 10 Nm (89 lb-in).

4. For DeVille and Eldorado vehicles only, install the heater pipe retainer bolt(s) across the back of the right cylinder head that was removed to access the camshaft cover bolts.

Tighten

Tighten the heater pipe retainer bolts to 2 Nm (18 lb-in).

5. Install the wiring harness bolt/retainer(s) across the back of the right cylinder head that were removed to access the camshaft cover bolts.

Tighten

Tighten the wiring harness retainer bolts to 6 Nm (53 lb-in).

6. For DeVille and Eldorado vehicles only, raise the front of the engine by turning the J 28467-34 hook wing nut ten full turns.

7. Remove the tie straps used to position the engine wiring harness away from the right camshaft cover.

8. Raise and suitably support the vehicle.

9. For DeVille and Eldorado vehicles only, install the two front engine frame mounting bolts.

Tighten

Tighten the engine frame bolts to 100 Nm (74 lb-ft).

10. For Eldorado vehicles only, install the left front splash shield retaining clips removed to access the left front frame cradle bolt.

11. For DeVille and Eldorado vehicles only, install the frame-to-body deflector and the bolts.

Tighten

Tighten the frame-to-body deflector bolts to 6 Nm (53 lb-in).

12. For Eldorado and Seville vehicles only, connect the wiring harness to the transmission brace.

13. For Seville vehicles only, connect the wiring harness connector to the A/C switch.

14. For Aurora, Eldorado and Seville vehicles only, connect the wiring harness connector to the vehicle speed sensor (VSS).

15. For Aurora vehicles only, connect the wiring harness connector to the variable steering actuator (VSA).

16. For Aurora vehicles only, connect the wiring harness connector to the power steering pump pressure switch (PSP).

17. For DeVille and Eldorado vehicles only, connect the converter to the intermediate pipe and install the nuts.

Tighten

Tighten the converter to intermediate pipe nuts to 25 Nm (18 lb-ft).

18. Remove the support and lower the vehicle.

19. Install the engine wiring harness and lock the three wiring harness retainers across the back of the right camshaft cover.

20. Install the starter wiring harness and lock the wiring harness retainer on the front of the right camshaft cover.

21. Connect the starter wiring harness connector.

22. Connect the wiring harness connector to the camshaft position sensor.

23. For Aurora, DeVille and Eldorado vehicles only, connect the oxygen sensor harness retainer to the center wiring harness retainer clip on the right camshaft cover.

24. For Seville vehicles only, connect the oxygen sensor harness retainer to the driver's side wiring harness retainer clip on the right camshaft cover.

25. Connect the oxygen sensor connector.

26. Connect the PCV and the hose to the right camshaft cover.

27. Install the EVAP solenoid and the bolt.

Tighten

Tighten the EVAP solenoid bolt to 12 Nm (106 lb-in).

28. Connect the EVAP wiring harness connector.

29. For Eldorado vehicles only, connect the EVAP tube to the intake manifold.

30. For Eldorado vehicles only, install the front spark plug wire harness retainer to the driver side rear fuel injector sight shield stud.





31. For Eldorado vehicles only, install the push retainer to the driver side rear fuel injector sight shield stud.





32. Connect the right side spark plug wires. Route the spark plug wires exactly as shown. If you do not route the wires as shown, a misfire or surge condition could occur.

33. Install the ignition control module.

34. For Eldorado vehicles only, place the ground strap for the ignition control module at the passenger's side inboard bolt location.

35. For Aurora, DeVille and Seville vehicles only, place the ground strap for the ignition control module at the passenger's side outboard bolt location.

36. Install the four ignition control module bolts.

Tighten

Tighten the ignition control module bolts to 12 Nm (106 lb-in).

37. Connect the four center coil wires to the ignition control module.

38. Connect the ignition control module wiring harness connectors.

39. For Aurora and Seville vehicles only, install the stepper motor and the nuts.

Tighten

Tighten the stepper motor nuts to 9 Nm (80 lb-in).

40. For Aurora vehicles only, connect the cruise cable at the stepper motor.

41. For Aurora vehicles only, connect the wiring harness connector to the stepper motor.

42. For Aurora vehicles only, connect the front harness to the harness interface.

43. For Seville vehicles only, connect the hood lamp harness to the stepper motor stud.

44. For DeVille and Eldorado vehicles only, remove the J 28467-6A lift hook bracket with the J 28467-7A lift hook and the J 28467-34 wing nut from each of the J 28467-2A tube and the J 28467-4A support assemblies.

45. For DeVille and Eldorado vehicles only, remove the J 28467-1A cross bracket assemblies from the left and the right J 28467-2A tube and the J 28467-3 strut tower tube.

46. For DeVille and Eldorado vehicles only, remove both the J 28467-2A tube and the J 28467-4A support assemblies.

47. For DeVille and Eldorado vehicles only, remove the J 28467-3 strut tower tube from the J 28467-5A strut tower support assemblies.

48. For DeVille and Eldorado vehicles only, remove the J 28467-33 wing nuts.

49. For DeVille and Eldorado vehicles only, remove both the J 28467-SA strut tower support assemblies from the J 28467-33 adapters.

50. For DeVille and Eldorado vehicles only, remove the J 28467-33 adapters from on top of the strut tower-to-tower brace nuts.

51. For DeVille and Eldorado vehicles only, remove the J 28467-33 adapters from the top of the strut tower-to-tower brace nuts.

52. For DeVille and Eldorado vehicles only, remove the bolt in the right engine strut bracket.

53. For DeVille and Eldorado vehicles only, install both the engine-to-radiator support torque struts and the bolts/nuts.

Tighten

Tighten the torque struts bolts/nuts to 78 Nm (758 lb-ft).

54. For DeVille and Eldorado vehicles only, remove the strut tower-to-tower brace nuts.

55. Install the strut tower-to-tower brace and the nuts.

Tighten

Tighten the strut tower-to-tower brace nuts to 28 Nm (21 lb-ft).

56. For DeVille and Eldorado vehicles only, install the fuel injector sight shield and the nuts.

Tighten

Tighten the fuel injector sight shield nuts to 3 Nm (27 lb in).

57. Connect the ground (negative) battery cable.

Tighten

Tighten the ground (negative) batter cable bolt at the battery to 15 Nm (11 lb-ft).

58. For Aurora and Seville vehicles only, install the rear seat lower cushion.

59. Re-establish any customer settings.

60. Install the GM Campaign Identification Label.