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Home›Repair guides›Control Valve Adjustment (on Engine)

Detroit Diesel 149 — Control Valve Adjustment (on Engine)

For the Detroit Diesel 149.

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Procedure

  1. Install pressure gages to read airbox pressure and
  2. Back out the adjusting screw on the control valve.
  3. Start the engine and run it at a speed and load that will
  4. Slowly adjust the screw on the 3-way valve until the
  5. Tighten the adjusting screw locknut.

Source: manual:detroit-diesel-149-workshop-manual-sections-3-thru-7-ab.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.