Some Interesting Components from 786

786 Piston 

 The cylinder diameter is about 26."

There are 3 ring grooves in each piston.


Photo: John Mandell
The rings are made up of segments.  The segments are assembled in pairs on a circular rod and then staggered so that the gap between each segment does not cause a leak.  There are 8 segment pairs for each ring groove.
Photo: John Mandell
Closer view of the ring segments assembled onto the circular rod.  These are the rings as removed from 786.  They will be replaced by freshly machined rings.
Photo: John Mandell
Each segment is about 10" long.  Each pair is made of one cast iron segment and a bronze segment.
Photo: John Mandell
Ring segment showing the profile
Photo: John Mandell
786 valves
Photo: John Mandell