My 915iS powered gyrocopter external oil cooler thermostat weeps oil at its connection. They are tight and leak at the conical metal-to-metal seal. I have found that using Del fitting seals usually fixes this issue, without having to make new lines. So that is my current plan to fix. This is the first maintenance I have performed on mine, or any other Rotax. As a licensed A&P, I have read SI-915 i-003R2, watched the Rotax video, and feel I have a good understanding.
Since this is being done at the conditional inspection time, an oil change is also planned. My question to the you experts is whether it makes more sense to drain the oil, open/repair the oil seep, then refill with clean oil for the required purging, or to drain and refill with new oil, careful not to bump the prop, then open and repair the seep, followed by the purging process. The latter option may waste more new oil, but it seems that collecting and reusing new oil is commonly done. So no wastage, but more air?
I had planned to attend Rotax training prior to this effort, but you know how plans often go astray. Thanks in advance.
