The earliest carriers did have dry air cleaners located on the engine cover just above the engine. I saw the remnants of a couple of these aircleaners on some early mk1s we dug out of a beach about 6 years ago. The early cdn parts (FUC-1) manual will shed more light on where the serial number break occurred but by memory I think it was around #1200. Edited to add: FUC gives a changeover serial of #5788. The later oil bath style was also available as a retrofit to replace the earlier bellows air cleaner. See illustraions on p 104 and 106 of FUC-3.
Last edited by rob love; 02-02-16 at 18:24.
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