I have two Hercules manuals as far as I can remember. Here is the first, a post war manual from a pretty ordinary photocopy. The other is a fault finding manual from mid war from memory. I just have to find and scan it.
Found my trouble shooting manual photocopy and it is only a small fraction of the whole manual. Went searching on line to see if anyone else had it I could link to and found Avialogs has a copy with about 30 more pages and clearer text but my copy has better copies (photos) of figures 10 and 11.
Thanks for sharing those documents. The Hercules manual names the oil additive in Shell 100B, which I have been trying to find for a while.
Has your copy of the Maintenance and Fault Finding document got page vi? It's missing from Avialogs.