My engine HAD an oil clutched cooling fan return oil from which flowed into the front cover in addition to any other oil supply routing there if any. It is this any that I want to know more about because I have replaced the fan with a continuously engaged one without the clutch and its oil system. I would not want to leave the gears hi and dry so I wonder what other oil sources are flowing there (surely not all 912's use a hydraulically clutched fan)?