Could you clarify if you are looking for a or a digital technical manual for the Jacobs R-755 engine? Installation Manual - Blue Vision LED

: Archive files containing technical drawings or installation steps for aviation or industrial lighting systems (e.g., "Installation manual of R series light.rar").

Based on the technical context of the query, it is likely that "piece covering 755" refers to a specific manual or part related to the (or Lycoming R-755) radial engine.

: Comprehensive service instructions, such as T.O. 02-30AC-2 , which covers the R-755-9 engine models.