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

The video outlines the steps necessary to purge the oil system on a Rotax 9 Series aircraft engine. Please remember to reference the latest version of the Rotax 9 Series Installation manual for steps and torque specs. All Rotax aircraft manuals are available at www.flyrotax.com
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[@lonnylandry8484]

Great

[@FlyingShark081]

Great 👍🏻👍🏻

[@dannyabbott4352]

Excellent video, kudos to you my fine sir !

[@davidmcalister6806]

Thank you for your time with making this video.

[@JM_Aeroservice]

My pleasure!

[@robertfisher4150]

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.

[@JM_Aeroservice]

Yes great time to check cover clearance and no downside to replacing orings 👍🏼

[@Ryan-xu3zf]

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

[@frizzlefry5904]

Hi, can you hand prime without presrure ? and purge the lines of air if you dont have access to a compressor etc, thank you.

[@tonysimi5763]

Very professional video!

[@aztecwarrior1421]

Is this part 1?

[@MrMorden00]

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

[@liviamaharaniseptiani]

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.

[@shubhamrawat1557]

Do you have a full video on pneumatic synchronisation??

[@Dragon911SC]

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

[@pipertime1]

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?

[@JM_Aeroservice]

I use gravity and a small funnel to prefill a completely empty oil cooler and lines and vent out the air then purge the system the way it’s shown in the video and it will purge quicker.

[@JM_Aeroservice]

I use gravity and a small funnel to prefill a completely empty oil cooler and lines and vent out the air then purge the system the way it’s shown in the video and it will purge quicker.

[@SuperZardo]

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?

[@keithashcraft1184]

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?

[@JM_Aeroservice]

If done correctly the lifters should pump up just by rotating by hand. If lifters clearances are marginal you can do a short run(

[@chrisarvin1715]

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

[@paulgodfrey2323]

Most speed shops or hydraulic hose suppliers

[@jpsubhash]

🤝🤝🤝🤝

[@JM_Aeroservice]

Thank you I hope it was helpful!

[@cornishflyer2662]

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

[@JM_Aeroservice]

No not necessary after the oil change just keep the line going from the tank to the oil cooler elevated so it doesn’t drain out and make sure not to rotate the prop once the line is disconnected

[@cornishflyer2662]

@@JM_Aeroservice brilliant. Thank you Jeremy.
Do I need to remove and clean the oil filter tank like I saw you do in a video on the 25h??

[@julesviolin]

Why is it necessary to remove any pipes during an oil change?

[@annanapolitano5057]

Cambio olio rotai 912