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Detroit Diesel — Valve Lash and Injector Setting Adjustment Sequence

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

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Procedure

  1. 1. Intake Valve
  2. 4. Locknut
  3. 2. Valve Button
  4. 5. Feeler Gage
  5. 3. Intake Rocker Arm Assembly
  6. 6. Tip of Intake Valve
  7. Figure 4
  8. Intake Valve Adjustment
  9. 16. Loosen the locknut, and turn the adjusting set screw until the feeler gage produces an even
  10. smooth pull between the valve stem and valve button.
  11. 17. Torque the locknut to 41 - 47 N·m (30 - 35 lb·ft) and remove the feeler gage. Reinsert the
  12. feeler gage to ensure that the adjustment did not change when the locknut was tightened.
  13. Readjust as necessary.
  14. 18. The exhaust valves are adjusted the same way as the intake valves, using a 0.508 mm (0.020
  15. in.) feeler gage. See Figure 5.
  16. 1. Location of Identification Groove
  17. 5. Locknut
  18. 2. Valve Button
  19. 6. Exhaust Rocker Arm Assembly
  20. 3. Allen Wrench
  21. 7. Feeler Gage
  22. 4. Adjusting Screw
  23. 8. Tip of Exhaust Valve
  24. Figure 5
  25. Exhaust Valve Adjustment
  26. 19. Repeat steps 11 through 18 u
  27. ntil all injectors and valves have been set.
  28. 20. After all the injectors and valves have been adjusted to specification, remove the cap screw
  29. and spacers holding down the rocker shaft.

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.