This manual covers the Pratt & Whitney R-985 Wasp Junior and Wasp Hornet aircraft engines. These radial piston engines are renowned for their robust design and reliable performance, making them a popular choice for a variety of vintage aircraft and specialized applications. Their enduring legacy is a testament to the advanced engineering and quality craftsmanship inherent in their development and production.

This document serves as a comprehensive guide for the overhaul and maintenance of the Pratt & Whitney R-985 engine. It details essential procedures, technical specifications, and critical information necessary for ensuring the optimal performance and longevity of these engines. Whether for routine servicing or in-depth repair, this manual provides the detailed instructions required by mechanics and technicians.