That’s because he has this drain valve on his. When you remove the drain plug on the bottom of the oil can, you logically replace the crush ring with a new one when re-assembling.
My Rotax powered aircraft was spitting oil today. Upon inspection, the oil filter was noticeably loose. Wondering if it was improperly installed or vibrated loose over time. Mechanic said the Rotax motor is the only airplane motor he knows of where the oil filter doesn’t lock into place. Dipstick reading in the middle pre- and post-flight.
I used a 1in heavy duty heat shrink with built it glue that seals. It’s not fire resistant but it keep the lines sealed and fuel from wicking into the firesleeve fiber
That would be a value for the overload clutch break away not the friction torque resistance that we are testing for in the video. Both require locking the crank shaft as described in the video.
1. Did you actually rotated the prop. 50Xs?? 6:39. You mention putting 2.5 lt of oil, then running the engine, burp, then adding the additional remaining oil, correct? How long did you run the engine for? Great video!!!!
If there is at least one spark plug removed from each cylinder, there are no blow-by gases available to increase crankcase pressure and push oil back from the dry sump (the bottom of the crankcase) into the return line. Maybe that's why the return line is directed against the ground, so oil can follow gravity. However, while it is clearly in the interest of safety to remove the spark plug so the engine won't be able to suddenly start, I wonder if there is a real technical reason for removing the spark plugs. You say you turn the prop about 100 times before you see oil coming out of the return lines. Why is that? If the spark plugs were fitted, it would only take a few rotations of the propeller to increase the crankcase air pressure enough (by manually created blow-by gases during engine compression). I know you just follow guidance provided by Rotax, but still I wonder if having the spark plugs fitted would impede the oil purge in some way. Any ideas?
Hi Jeremy, thanks for sharing your experience. Do you know how prone is it to damage the valve gaskets? I want to measure the lifter distance but do not have the spare gaskets. Also, when draining the oil lines on 915 engines, should I drain the turbo sump, turbo oil suction line, and turbo oil pressure line as well? If I do, will purging make the turbo lines prime? Really appreciate your suggestion.
