HomeRepair guides4, Remove the twelve cap-screws.

Cummins — 4, Remove the twelve cap-screws.

For these Cummins models: GTA38, GTA38, GTA50, GTA50.

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Procedure

  1. 5. Remove the thermostat housing and gasket.
  2. 6. Remove the thermostats and seals.
  3. 7.Clean and inspect the thermostat housing for
  4. cracks, pitting or other damage.

Source: manual:Cummins Gas GTA38-50 Manual 1999 (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.