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Removal NOTE: Removal of the vertical EGR cooler is not required to service the thermostats. 1. Remove the upper cooling fan shroud. For additional information, refer to Cooling Fan Shroud — 6.4L Diesel, Upper in this section. 2. Remove the degas bottle. For additional information, refer to Degas Bottle — 6.4L Diesel in this section. 3. Using a mirror, find the end of the upper radiator hose spring clip. Remove the spring clip, disconnect the upper radiator hose from the thermostat housing and position the upper radiator hose aside. 4. Remove and discard the nut and the vertical EGR cooler lower clamp. 5. Remove the bolt and the vertical EGR cooler lower bracket. 6. NOTE: Vertical EGR cooler removed from art for clarity. Disconnect the wiring from the heater return tube. 7. Remove the 2 bolts and position out the LH heater return tube. • Remove and discard the O-ring seal. 8. NOTE: The 6.4L diesel engine uses 2 thermostats. Remove the 4 bolts, the collar and the thermostat housing. • Lift the bottom of the collar up and rotate toward the engine to remove. 9. NOTICE: If the thermostats are contaminated with engine oil, new thermostats must be installed. Reusing a thermostat that has been exposed to engine oil may result in engine overheating. Remove the thermostats and the gasket from the thermostat housing. • Discard the gasket. Installation 1. Install a new gasket and the thermostats into the thermostat housing. 2. Install the thermostat housing, the collar and the 4 bolts. • Tighten to 13 Nm (115 lb-in). 3. NOTE: Vertical EGR cooler removed from art for clarity. NOTE: Install a new O-ring seal. Install the LH heater return tube and the 2 bolts. • Tighten to 13 Nm (115 lb-in). 4. Connect the wiring to the heater return tube. 5. Position the lower vertical EGR cooler bracket and loosely install the bolt. 6. Install a new vertical EGR cooler lower clamp. Tighten the clamp nut in 3 stages. • Stage 1: Tighten the nut to 10 Nm (89 lb-in). • Stage 2: Loosen the nut 720 degrees (2 complete turns). • Stage 3: Tighten the nut to 8 Nm (71 lb-in). 7. Tighten the lower EGR cooler bracket bolt. • Tighten to 62 Nm (46 lb-ft). 8. Connect the upper radiator hose to the thermostat housing. Install the spring clip. • Verify the spring clip is correctly seated. 9. Install the degas bottle. For additional information, refer to Degas Bottle — 6.4L Diesel in this section. 10. Install the upper cooling fan shroud. For additional information, refer to Cooling Fan Shroud — 6.4L Diesel, Upper in this section.

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Principles of Operation Differential Electronic Module (DEM) and Active On-Demand Coupling The main role of the active on-demand coupling and the differential electronic module (DEM) is to regulate the all wheel drive (AWD) function by distributing torque between the front and rear axles. The system consists of a coupling that combines mechanical, hydraulic and electronic sections. The coupling unit is attached to the rear axle, between the differential gear and the driveshaft. The mechanical and hydraulic sections are driven by the driveshaft. Active on-demand coupling (AOC) has the following characteristics: Permanent AWD with electronic control of torque transfer front to rear 4X4 control module integrated into the DEM Similar to four wheel drive (4WD) operation No driveline wind-up during slow speed maneuvers or parking The system is not sensitive to size differences between the 4 road tires (when driving with a spare wheel, for example). The system is not sensitive to being towed with one axle raised. Inspection and Verification — Electronic Shift 1. Visually inspect for the following obvious signs of mechanical and electrical damage. Visual Inspection Chart Mechanical Axle shafts and universal joints Driveshaft and universal joints Rear differential Differential electronic module (DEM) Fluid leaks Matching tire size 2. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position. 3. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual. 4. Carry out the DATA LINK DIAGNOSTICS test. If the scan tool responds with: CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00. NO RESP/NOT EQUIP for DEM, GO to Pinpoint Test A. SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the anti-lock brake system (ABS) module self-test. Carry out one key cycle after clearing codes. 5. If the DTCs retrieved are related to the concern, go to the 4X4 Control Module (DEM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. 6. NOTE: Not all DTCs cause the traction control indicator to illuminate. Refer to the table for specific DTCs. When the 4X4 control module (DEM) detects certain types of faults in the AWD system, a DTC is set and the traction control indicator will stay illuminated until the condition has been repaired and the DTCs are cleared using the scan tool. Carry out one key cycle after clearing codes. DTC P0562 System Voltage Low P0563 System Voltage High P0602 Powertrain Control Module (PCM) Programming Error P0606 ECM/PCM Processor Electrical Smart junction box (SJB) mini-fuse 19 (10A) Differential electronic module (DEM) Wiring harness Connector(s) Circuitry Description Traction Control Indicator State OFF OFF ON ON

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NOTE: Before starting the adjustment process, inspect the top for damage, make sure that the door window glass and rear quarter glass are correctly adjusted then completely lower all window glass. NOTE: After each adjustment make sure the convertible top operates correctly. The Convertible Top Dowel Pins Fall Forward (Overshoot) or Rearward (Undershoot). The Receiver Cups — Cam Bolt Adjustment. 1. Remove the quarter trim panel. For additional information, refer to Section 501-05. 2. Close the convertible top and examine the position of the dowel pins relative to the receiver cups. 3. Move the convertible top to the half-open position to access the cam bolt. 4. NOTE: Rotating the top of the cam bolt toward the front of the vehicle will lengthen the top, increase the tension on the top and increase pull-down effort. Rotating the cam bolt in the opposite direction will have the opposite effect. NOTE: Turn the adjusting cam one notch at a time. Adjust the adjusting cam as needed. 1. Remove the cam stop set screw. 2. Rotate the adjusting cam. 3. Install the cam stop set screw. 5. Make sure the convertible top operate correctly. 6. Install the quarter trim panel. For additional information, refer to Section 501-05. 7. Close the convertible top. Convertible Top Lifts Up Unevenly — Lift Cylinder and C-pivot Inspection 8. Remove the quarter trim panel. For additional information, refer to Section 501-05. 9. NOTE: This step applies to vehicles equipped with the Mach sound system. Remove the screws and disconnect the electrical connectors. 10. Remove the screws. 11. Remove the speakers. For additional information, refer to Section 415-03. 12. Move the convertible top to the half-open position and support the convertible top in that position. 13. Remove the lift cylinder rod mounting bolts. 14. Remove the nuts and support the lift cylinders. 15. Using the convertible top switch, retract the lift cylinder rods and check for bent or binding rods. If one rod bottoms out 25mm (1 inch) or more before the other, the lagging lift cylinder may be bent and will need to be replaced. 16. With the lift cylinder rods retracted, manually lower the convertible top. 17. Manually lift each side rail 7.5-10 cm (3-4 inches) to check for obvious binding. Side arms should have equal resistance, side-to-side. If the resistance is noted, loosen the clamp load of the c-pivot rivet with using a center pinch. If a dramatic resistance is still noted replace the c-pivot rivet with shoulder bolt kit (F5ZZ- 76539A04-A). 18. Position the lift cylinders and install the nuts. 19. Install the two cylinder rod mounting bolts. 20. Install the speakers. For additional information, refer to Section 415-03. 21. Install the screws. NOTE: This step applies to vehicles equipped with the Mach sound system. 22. Install the screws and connect the electrical connectors.

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All vehicles 1. Remove the transmission. For additional information, refer to Section 307-01 for automatic transmissions or Section 308-03 for manual transmissions. Vehicles with manual transmission 2. Remove the clutch disc and pressure plate. For additional information, refer to Section 308-01. All vehicles IN-VEHICLE REPAIR (Continued) 3. Remove the 10 bolts and flexplate or flywheel. • Discard the bolts. 4. NOTICE: Use extreme care when removing the flywheel front adapter to prevent damage to the alignment dowel pin. Remove the flywheel front adapter. 5. NOTICE: To prevent engine damage, do not remove the rear primary crankshaft flange bolts under any circumstances. If the flange is removed and reinstalled, it will result in engine vibration and premature transmission component wear. NOTICE: Drill only deep enough to penetrate the seal. Engine damage will occur if the seal is drilled too deep. NOTE: On original service seals, if equipped, the wear ring will be removed separately. Using a center punch, mark a location for 2 holes 180 degrees apart, 9.53 mm (0.375 in) from the outer diameter of the crankshaft flange. Using a drill bit of the appropriate size for the Slide Hammer being used, drill a hole on each side of the crankshaft rear seal as shown. Drill the holes to a depth of 8.76 mm (0.344 in) to capture the metal case of the crankshaft rear seal as well as the wear ring. 6. Using the 2 drilled holes, the Slide Hammer and a commercially available body dent puller attachment, walk the seal out of the rear cover by alternating from side to side to remove the crankshaft rear seal. • Discard the crankshaft rear seal. Vehicles with an original service seal 7. NOTE: Original equipment seals will not have a wear ring. If a service part has previously been installed, it will have a wear ring. If the service part was a redesigned seal, the wear ring will have been removed with the seal in the previous step. If the service part was an original service seal, the wear ring will remain in the engine after the seal has been removed. If the wear ring remained in the engine after removing the seal, use the Crankshaft Rear Wear Ring Remover to remove and discard the crankshaft rear seal wear ring. All vehicles 8. Clean and inspect the crankshaft sealing surface. Installation Vehicles with an original service seal 1. NOTICE: The crankshaft rear seal and wear ring are a one-piece design and need to be installed as an assembly. Do not separate the wear ring from the crankshaft rear seal or damage to the seal may occur. NOTE: An original service seal will have a wear ring without a flange and pre-applied threadlock. NOTE: Apply a bead of threadlock around the circumference of the outer rear edge of the secondary crankshaft flange.

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6.0L DIESEL FUEL IN ENGINE COOLANT DIAGNOSTICS FORD: 2003-2005 Excursion 2003-2007 F-Super Duty 2004-2008 E-Series ISSUE Some 2003-2005 Excursion, 2003-2007 F-Super Duty and 2004-2008 E-Series vehicles equipped with a 6.OL engine may exhibit fuel in the engine coolant, due to leaks in the cylinder head fuel injector area. Symptoms may include fuel in engine coolant and coolant expulsion from the degas bottle. ACTION Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE Inspect the degas bottle for evidence of fuel in engine coolant. If diesel fuel is present, refer to the following Service Procedure. If not, follow normal diagnostics. NOTE IT IS VERY IMPORTANT TO ENSURE A COMPLETE FLUSHING OF THE ENGINE COOLING SYSTEM IS PERFORMED TO REMOVE ALL CONTAMINANTS FOLLOWING REPAIR. 1. Drain coolant from cooling system. 2. Remove all injectors from both cylinder heads. Refer to Workshop Manual (WSM), Section 313-04C. 3. Wipe injector bore clean of oil and fuel then apply a thin layer of bubbly type liquid hand soap, dish soap or laundry soap inside each injector bore. Ensure injector sleeve lip and cylinder head casting are coated with a soap layer. (Adding a small amount of water to the soap aids in creating bubbles) 4. Fit the cooling system pressure tester, refer to WSM, Section 303-03. (Do not add coolant) 5. Apply 5-10 psi (34-69 kPa) of air pressure to sealed cooling system. It is suggested to use a hand operated pressure tester or regulated shop air with tee in degas hose to degas bottle. NOTE MORE THAN 10 PSI (69 kPa) AIR PRESSURE CAN PUSH THE SOAP FROM THE LEAK POINT AND NO BUBBLES WILL BE PRESENT OR CREATED, MAKING DIAGNOSIS DIFFICULT. 6. Inspect each injector bore for bubbles. (A light and mirror or bore-scope may aid in pinpointing a leak location.) If bubbles are observed, determine if bubbles originate from the injector sleeve lip (Figure 1) or cylinder head casting. (Figure 2) Refer to cutaway view of the cylinder head. (Figure 3) a. Replace the injector sleeve if found to be leaking at sleeve lip, refer to WSM 303-04C. b. Replace cylinder head if leaking through casting, refer to WSM 303-01C. c. Flush cooling system, refer to another applicable Technical Service Bulletin (TSB) for proper cooling system flush procedures.