Detroit Diesel — Remove the cylinder head cover for each cylinder head, as required. Refer to section 1.1.1.

A Detroit Diesel service procedure — check it applies to your exact model before use.

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Procedure

1. Remove the cylinder head cover for each cylinder head, as required. Refer to section 1.1.1.
2. Remove the charge-air manifold. Refer to section 6.1.1. FIRE To avoid injury from fire, keep all potential ignition sources away from diesel fuel, including open flames, sparks, and electrical resistance heating elements. Do not smoke when refueling. FIRE To avoid injury from fire caused by heated diesel-fuel vapors: □ Keep those people who are not directly involved in servicing away from the engine. □ Stop the engine immediately if a fuel leak is detected. □ Do not smoke or allow open flames when working on an operating engine. □ Wear adequate protective clothing (face shield, insulated gloves and apron, etc.). □ To prevent a buildup of potentially volatile vapors, keep the engine area well ventilated during operation. (Rev. 3/04) All information subject to change without notice. 2-22 From Bulletin 2–MBE4000–06 6SE412 0403 Copyright © 2006 DETROIT DIESEL CORPORATION MBE4000 SERVICE MANUAL
3. Remove the injector line. See Figure 2-14. Refer to section 2.3.1.
4. Retaining Bolt
5. Constant-Throttle End Cover
6. Tensioning Arm
7. O-ring (transfer tube)
8. Nozzle
9. Transfer Tube
10. O-ring
11. Thrust Bolt
12. Heat Isolator
13. Injector Line Figure 2-14 Fuel Injection System (exploded view)
14. Remove the thrust bolt and the transfer tube. Discard the old O-ring. NOTE: If the transfer tube is stuck in the cylinder head, use the injector unit pump puller (J–46375) to remove the transfer tube.
15. Remove the tensioning arm. All information subject to change without notice. (Rev. 3/04) 6SE412 0403 Copyright © 2006 DETROIT DIESEL CORPORATION From Bulletin 2–MBE4000–06 2-23
16. Attach the injector unit pump puller (J-46375) and adaptor (J-46384). Thread the narrow end of the adaptor onto the internal M8 threading in the head of the nozzle. Thread the impact extractor onto the wide end of the adaptor. See Figure 2-15.
17. Nozzle
18. Heat Isolator
19. O-ring
20. Constant-Throttle End Cover Figure 2-15 Pulling the Nozzle NOTE: Do not attempt to take apart the nozzle. If there is a problem, replace the nozzle.
21. Using the impact extractor (J-46375), remove the nozzle from the cylinder head. Discard the O-ring and the heat isolator. NOTICE: Pull the nozzle straight out of the cylinder head. Do not twist it, turn it, or use pliers. This could damage the nozzle.
22. Remove the impact extractor (J-46375) and adaptor (J-46384) from the nozzle.
23. Remove the O-ring and heat isolator from the nozzle holder and discard. If necessary, remove the heat isolator from the cylinder head using the heat isolator puller (J-46933). [a] Install the end of the puller (J-46933) into the tip in the cylinder head. Turn the shaft of the tool to expand into the tip. [b] Use the slide hammer on the puller tool and remove and discard the heat isolator.
24. Cap off or cover the openings on the unit pump and nozzle to prevent contamination. (Rev. 3/04) All information subject to change without notice. 2-24 From Bulletin 2–MBE4000–06 6SE412 0403 Copyright © 2006 DETROIT DIESEL CORPORATION MBE4000 SERVICE MANUAL
25. Using a dial caliper, measure the length, of the tensioning arm M10 retaining bolt, from the end of the bolt to the bottom of the flange. See Figure 2-16. The acceptable lengths are listed in Table 2-1. Replace any bolt which does not meet these specifications.
26. Dial Caliper
27. Bottom of Flange
28. End of Retaining Bolt Figure 2-16 Measuring the Tensioning Arm Retaining Bolt Description Length, mm (in.) Shaft length when new
29. Lubricate a new nozzle O-ring with a light coating of engine oil and install it on the nozzle.
30. Using the heat isolator installer (J-46384), press the new heat isolator onto the nozzle. [a] Position the new heat isolator over the nozzle. All information subject to change without notice. (Rev. 3/04) 6SE412 0403 Copyright © 2006 DETROIT DIESEL CORPORATION From Bulletin 2–MBE4000–06 2-25
31. Heat Isolator
32. Vise
33. Nozzle Figure 2-18 Pressure-Fitting the Heat Isolator onto the Nozzle [d] Open the vise and remove the two parts of the heat isolator installer from the nozzle holder. Check that the heat isolator is firmly pressed onto the nozzle. NOTE: Take care that the nozzle holder is installed correctly and is aligned properly with respect to the transfer tube. All information subject to change without notice. (Rev. 3/04) 6SE412 0403 Copyright © 2006 DETROIT DIESEL CORPORATION From Bulletin 2–MBE4000–06 2-27
34. Install the nozzle in the cylinder head. Align the notch in the tensioning arm with the pin on the top of the nozzle.See arrow in Figure 2-19.
35. Injector Line Fitting
36. Retaining Bolt
37. Thrust Bolt
38. Tensioning Arm
39. O-ring (transfer tube)
40. End Cover (Constant-Throttle)
41. Transfer Tube
42. Heat Isolator
43. Nozzle
44. Protective Sleeve
45. O-ring (nozzle) Figure 2-19 Positioning the Nozzle
46. Install the retaining bolt in the tensioning arm. Tighten the bolt 50 N·m (37 lb·ft). NOTE: The tensioning arm insures the correct positioning of the nozzle. (Rev. 3/04) All information subject to change without notice. 2-28 From Bulletin 2–MBE4000–06 6SE412 0403 Copyright © 2006 DETROIT DIESEL CORPORATION MBE4000 SERVICE MANUAL
47. Lubricate a new transfer-tube O-ring with a light coating of engine oil and install it on the transfer tube. NOTE: Do not tighten the thrust bolt until after the tensioning arm has been fully tightened to the correct torque value.
48. Install the transfer tube in the cylinder head. Tighten the thrust bolt 45 N·m (33 lb·ft).
49. Install the injector line. Refer to section 2.3.2.
50. Install the charge-air manifold. Refer to section 6.1.2.
51. Install the cylinder head cover(s), as removed. Refer to section 1.1.2.
52. Install the engine trim covers. All information subject to change without notice. (Rev. 3/04) 6SE412 0403 Copyright © 2006 DETROIT DIESEL CORPORATION From Bulletin 2–MBE4000–06 2-29

Source: manual:2-mbe4000-06a - Revised Fuel Filter Removal and Installation Procedure.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.