LLY Thermostat Housing Crossover Replacement (6.6L (LLY) Engine) - TheDieselGarage.com
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LLY Thermostat Housing Crossover Replacement (6.6L (LLY) Engine)

Service Information

Document ID: 1364892


Thermostat Housing Crossover Replacement (6.6L (LLY) Engine)
Removal Procedure





  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement in Engine Mechanical - 6.6L (LLY).
  2. Drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Disconnect the negative battery cables. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  4. Remove the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .
  5. Remove the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 6.6L (LLY).
  6. Disconnect the air conditioning (A/C) compressor clutch electrical connector (5).
  7. Disconnect the A/C cut out switch electrical connector.



  8. Remove the A/C compressor bolts.
  9. Reposition the A/C compressor, with the hoses attached, to the right side of the engine compartment.



  10. Remove the generator positive cable to generator nut.
  11. Remove the positive cable from the generator.
  12. Remove the clip holding the positive cable to the engine front cover.
  13. Remove the battery positive cable junction block to power steering pump bolt (1).
  14. Move the generator positive cable and the junction block bracket aside.



  15. Disconnect the generator electrical connector.
  16. Disconnect the engine coolant temperature (ECT) sensor electrical connector.



  17. Remove the power steering pump bracket bolts.
  18. Reposition the power steering pump bracket and secure to the side.
    Do not remove the power steering pump from the bracket.

    The hoses and battery cables can remain on the power steering pump.




  19. Remove the heater outlet hose bracket bolt from the generator bracket.
  20. Remove the idler pulley.
  21. Remove the generator bracket bolts.
  22. Remove the generator bracket and position to the side.
    The generator does not require removal.

    The drive belt tensioner does not require removal.

  23. Remove the oil fill tube. Refer to Oil Filler Tube Replacement in Engine Mechanical - 6.6L (LLY).
  24. Remove the water outlet. Refer to Water Outlet Tube Replacement .



  25. Reposition the exhaust gas recirculation (EGR) hose clamp at the EGR coolant pipe.
  26. Remove the EGR coolant pipe bolt.
  27. Remove the EGR coolant pipe with O-ring seal from the crossover.



  28. Reposition the turbocharger coolant return pipe hose clamp.
  29. Remove the turbocharger coolant return pipe hose.



  30. Remove the fuel line bracket bolt at the thermostat housing crossover.
  31. Remove the cooling fan pulley. Refer to Cooling Fan Pulley Replacement .



  32. Remove the water pump inlet pipe bolts.



  33. Remove the thermostat housing bolts and nuts.
  34. Remove the thermostat housing, with the bypass pipe.
  35. Remove and discard the thermostat bypass pipe to water pump O-ring seal.
  36. Remove and discard the thermostat housing gaskets.
  37. If necessary, perform the following steps:
    37.1. Remove the thermostat bypass pipe from the thermostat housing.

    37.2. Remove and discard the thermostat bypass pipe O-ring seal.

    37.3. Remove the thermostat cover bolts and cover.

    37.4. Remove the thermostats.

    37.5. Remove and discard the thermostat seals.

  38. If required, clean and inspect the thermostat housing. Refer to Engine Coolant Thermostat Housing Cleaning and Inspection in Engine Mechanical - 6.6L (LLY).
Installation Procedure






  1. If necessary, perform the following steps:
    1.1. Install NEW seals to the thermostats.

    1.2. Install the thermostats.
    Notice: Refer to Fastener Notice in the Preface section.
    1.3. Install the thermostat cover and bolts.
    Tighten
    Tighten the bolts to 21 Nm (15 lb ft).
    1.4. Install a NEW O-ring seal to the thermostat bypass pipe.

    1.5. Install the thermostat bypass pipe to the thermostat housing.


  2. Install a NEW thermostat bypass pipe to water pump O-ring seal.
  3. Install the thermostat housing using NEW gaskets.
  4. Install the thermostat housing bolts and nuts Tighten
    Tighten the bolts/nuts to 21 Nm (15 lb ft).




  5. Install the water pump inlet pipe bolts. Tighten
    Tighten the bolts to 21 Nm (15 lb ft).

  6. Install the cooling fan pulley. Refer to Cooling Fan Pulley Replacement .



  7. Install the fuel line bracket bolt at the thermostat housing crossover. Tighten
    Tighten the bolt to 21 Nm (15 lb ft).




  8. Install the turbocharger coolant return pipe hose.
  9. Position the turbocharger coolant return pipe hose clamp.



  10. Install the EGR coolant pipe with O-ring seal to the crossover.
  11. Install the EGR coolant pipe bolt. Tighten
    Tighten the bolt to 25 Nm (18 lb ft).

  12. Position the EGR hose clamp at the EGR coolant pipe.
  13. Install the water outlet. Refer to Water Outlet Tube Replacement .
  14. Install the oil fill tube. Refer to Oil Filler Tube Replacement in Engine Mechanical - 6.6L (LLY).



  15. Position the generator bracket.
  16. Install the generator bracket bolts. Tighten
    Tighten the bolt to 50 Nm (37 lb ft).

  17. Install the idler pulley. Tighten
    Tighten the bolt to 43 Nm (32 lb ft).

  18. Install the heater outlet hose bracket bolt to the generator bracket. Tighten
    Tighten the bolt to 21 Nm (15 lb ft).




  19. Position the power steering pump bracket.
  20. Install the power steering pump bracket bolts. Tighten
    Tighten the bolt to 46 Nm (34 lb ft).




  21. Position the generator positive cable and the junction block bracket.
  22. Install the battery positive cable junction block to power steering pump bolt (1). Tighten
    Tighten the bolt to 9 Nm (80 lb in).

  23. Install the clip holding the positive cable to the engine front cover.
  24. Install the positive cable to the generator.
  25. Install the generator positive cable to generator nut. Tighten
    Tighten the nut to 9 Nm (80 lb in).




  26. Connect the ECT sensor electrical connector.
  27. Connect the generator electrical connector.



  28. Position the A/C compressor, with the hoses attached.
  29. Install the A/C compressor bolts. Tighten
    Tighten the bolts to 50 Nm (37 lb ft).




  30. Connect the A/C cut out switch electrical connector.
  31. Connect the A/C compressor clutch electrical connector (5).
  32. Install the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 6.6L (LLY).
  33. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement .
  34. Connect the negative battery cables. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  35. Fill the cooling system. Refer to Cooling System Draining and Filling .
  36. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement in Engine Mechanical - 6.6L (LLY).
2008 General Motors Corporation. All rights reserved.



Devil Girl 2006 2500HD LBZ Ex-Cab 4x4

EFI Live tuned by IdahoRob,MPI twins installed by BigDipper,PPE lift pump, BigDipper 30% injectors, BigDipper Trans Precion ML converter.PPE Twin Cp3's.

Alot Of thanks To Kat & Pat at duramax diesels, Joe & Dan at PPE,George aka BigDipper
RIP LBZ 6/1/08@5:44pm she was strong

She's Alive again

Born on July 27, 2008, 11:59:02 PM

http://www.dieselbuilder.com/Media/P...adoBuild_2.pdf
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