Detroit Diesel — Two-Piece Rocker Covers" for two-piece rocker cover, and refer to section 1.6.3 "Removal

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

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Procedure

1. 3. If equipped with Jake Brakes®, remove the electrical connections at both brake solenoids.
2. NOTE:
3. When removing retaining bolts (1-6) and retaining nuts (7 and 8), loosen them one turn at a time so
4. as not to damage the rocker shaft or the cylinder head. See Figure 2.
5. NOTE:
6. Whenever nuts (1 or 8) are loosened or removed, the torque on the corresponding rocker shaft stud
7. must be checked. Torque to 126–146 N·m (93–108 lb·ft). See Figure 2.
8. 4. Remove the Jake Brake retaining bolts (1-6 and 9-14) and nuts (7 and 8) that retain the Jake
9. Brake and rocker arm shaft assembly to the cylinder head. See Figure 2.
10. Figure 2
11. Rocker Arm Shaft Bolts and Nut Identification Numbers
12. 5. Remove the Jake Brake and set aside, being careful not to damage the housing.
13. EYE INJURY
14. To avoid injury from flying debris when using compressed air,
15. wear adequate eye protection (face shield or safety goggles)
16. and do not exceed 276 kPa (40 psi) air pressure.
17. NOTE:
18. Cover the holes with hand towels to minimize oil spray.
19. 6. Attach a length of tubing to an air gun nozzle and blow out the oil from the rocker shaft bolt
20. holes.
21. 7. Lubricate each hold-down cap screw with clean engine oil prior to installation.
22. 8. Install three 170 mm (6.693 in.) long cap-screws on the rocker shaft using the Jake Brake®
23. spacers from the exhaust side of the engine.
24. 9. Tighten cap screws and spacers down equally until rocker shaft is against the cylinder head.
25. Then torque the cap screws in the following sequence:
26. [a]
27. Starting with the middle cap screw, on the camshaft , following the sequence for tightening
28. bolts (1-6) and nuts (7 and 8), torque to 55 N·m (40 lb·ft). See Figure 3.
29. [b]
30. Final torque all to 102-126 N·m (75-93 lb·ft).
31. Figure 3
32. Housing Hold-Down Bolt Locations and Torque Sequence
33. 10. Insert a 3/4 in. drive breaker bar or ratchet into the square hole in the center of the crankshaft
34. pulley.
35. 11. Bar the engine in the direction of rotation and observe a cylinder where the injector rocker arm
36. is just beginning to depress the injector plunger; both the intake and exhaust valves should
37. be closed.
38. [a]
39. Stop turning the engine and mount a magnetic base dial indicator so you can monitor the
40. upward lift of travel of that injector lobe.
41. [b]
42. Set the pedestal of the dial indicator on the top of the injector cam roller. Adjust the
43. pedestal so it can travel the entire upward movement of the lobe.
44. [c]
45. Continue to slowly bar the engine over in the direction of rotation until the dial indicator

Source: manual:08 60-8 VALVE LASH ADJUSTMENTS.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.