valve adjusting guide: Pratt & Whitney, Twin Wasp

Plastic. Gift of Homer Hudson, SFO Museum Collection. 1999.015.001.

Pratt & Whitney Aircraft valve adjusting guide for Twin Wasp engines; white, dial shape with red, blue and black print; charts for center compression stroke, adjust exhaust, depress intake, depress exhaust, and adjust intake printed on front; instructions printed on reverse..

This is object is classified as "Equipment (Tool)", and is part of the Aviation Museum collection.