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Cummins — Adjustments of these types of governors should be

For these Cummins models: GTA8.3, GTA8.3 CD1, GTAR 3.

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Procedure

  1. 1. Remove the air crossover tube (water-to-air system only).
  2. 2. Disconnect the support clamps, hose clamps, and remove the vent tube. v
  3. 3. Remove the valve cover.
  4. 4. Locate top dead center (TDC) for cylinder No 1 by observing the marks on the vibration damper.
  5. 5. Use a feeler gauge to check or set clearance. Intake Clearance; 0.30 mm [0.012 inch]. Exhaust clearance: 0.61 mm [0.024 inch].
  6. 6. Check or set valves with the engine cold (below 60° C [140° F]).

Source: manual:CUMMINS GTA 8.3 Operation and Maintenance Manual 2001 (2).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.