Purging the oil system on a Rotax 9 Series Motor 912/914/915 

Excellent video, kudos to you my fine sir !

Thank you for your time with making this video.

Great video Jeremy! Thank you for sharing your knowledge and experience.

Very professional video!

Excellent video! Thanx. Something to verify is the clearance between adjacent valve covers. It’s also recommended to replace the valve cover gaskets as well.

Do you have a full video on pneumatic synchronisation??

Is this part 1?

Do you have a link for the correct cap to put over the oil tank fitting? Thanks.

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.

Will this procedure work with a high-flow in-line engine oil thermostat install?

Nice job, where can I buy the plug/cap to seal the oil container?

Well done!!! I'm replacing my oil lines on my 912 for the first time. Question, can I push oil first through the oil cooler to the pump and cut out the trapped air?

Cambio olio rotai 912

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?

Jeremy, You never showed that you started the engine between purge and checking the lifters. I am assuming the they will still pump up by hand. Is starting the engine necessary?

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Should this be done after every oil change?? Im soon to be doing my 25h