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Home›Repair guides›Control Valve Adjustment (on Bench) This procedure requires the use of two 0-40 psi (0 -

Detroit Diesel 149 — Control Valve Adjustment (on Bench) This procedure requires the use of two 0-40 psi (0 -

For the Detroit Diesel 149.

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Before you start

  • The control hose should be in place when

Procedure

  1. Attach one pressure gage to the discharge port of the
  2. Connect the second pressure gage between the
  3. Connect shop air pressure to the regulator valve.
  4. Loosen and back out the adjusting screw on the
  5. Adjust the air pressure regulator valve to obtain a
  6. Adjust the three-way valve screw until the gage on the

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.