This is my first comment I write in this forum; therefore, I hope I write this reply at the proper place.
Answering the question of AdeV: the Hamworthy compressor is rated at 24.1 Bar with a capacity of 10.2 M3/Hr.
Recently I acquired the same configuration as discussed and therefore I hope to be able to get more information i.e. specifications, operating and workshop manual and other details to restore it. The set I have was in a running condition before it was removed from a ship. According to the engine number and the identification plate on the compressor unit, all has been manufactured in 1973. All looks original however I did not start it as yet. As this is the first Lister I own, I want to be sure I do not damage it, therefore if you could let me know where to find information about the Lister (3.5/1 - 650 rpm) and the compressor it would be great. The set is painted blue, not sure if that is original although in 45 years it did help to preserve it. Photos can be provided.
Hne