Hullo oldiron....this will be a very interesting thread.........
The barring gear worm wheel [vertical shaft axis] & worm [horizontal shaft axis] is shown below in the bottom RH quadrant if the picture
I assume the geared electric drive is just FWD of the worm shaft
Do the museum authorities understand that to turn a cold engine, steam preheat may have been required together with full lubrication pumping available to all engine components?.....
In an engine such as this, the baring gear would have had a number of uses.....however the principal function would have been to turn an engine for maintenance purposes ie., to gain better access to a shaft journal
Is there any original maintenance documentation for the engine available?.......Derek