Kerry,
There are illustrated spares list and service manuals which are reprinted (and advertised on this forum) but I can not recall having seen an exploded diagram of the engine showing how it all assembles. Some of the earlier versions of combined handbook and spares lists show two section views through the engine with part numbers picked out, but I am not certain if they did this far into the mechanical inlet valve era. So they could be a significantly different from your 1918.
-Doug