Hi David, Richard,
Many thanks for your responses. I have measured the outside diameter on the oiler, which is 5.9mm for the pipe fitting and 5.2mm for the engine thread on Caton 1. But I don't have a means of measuring the pitch. The Caton 2 oiler threads are the same for the pipe fitting 5.9mm and the engine thread is smaller at 3.5mm? I'll get the nearest inch equivalent.
I have a stack of standard ME fittings for the pipework, but the engines threads are smaller and possible a different pitch?
I've now seen from another post on Model Boat Mayhem that the thread for the pipe fitting may be A/F? See the two posts below:
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Hi, Max Hemmens Caton engine threads, are just slightly smaller than todays std of 1/4 by 40 tpi, don't try and force a todays std union nut, or you will strip the threads,!!!
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Hi, I have just checked my old books, and Max Hemmens Caton engine, union threads are A/F and not to day sstd ME
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So I don't know if that helps. I've tried contacting Roy who posted the two answers above but I'm not sure if I have the right email address.
If I can help more please let me know.
Martin