Ford — Adjusting the Thermostatic Spring
Adjustments · Carburetor automatic choke
From a Ford service manual — check it applies to your exact model before use.
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Procedure
- Manually open the choke plate by rotating the choke shaft.
- Allow the thermostatic spring to slowly close the choke plate.
- When the choke housing is at 21 degrees C (70 degrees F), the choke plate should be within 0.8 mm (1/32 inch) of, but not touching, the choke bore.
- If the choke plate does not meet this dimension, loosen the three cover plate screws to rotate the cover as necessary and repeat.
- If the carburetor temperature is other than 21 degrees C (70 degrees F), readjust the cover plate; each mark denotes a 2.8 degrees C (5 degrees F) change.
- Tighten the three cover screws.
- Check the rotation of the choke shaft to be sure there is no sticking or binding before installing the carburetor.
Specs & values
- Choke plate within 0.8 mm (1/32 inch) of choke bore at 21 degrees C (70 degrees F)
Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.