ROTAX 912uls 600hr Gearbox Inspection

[@benbrannen755]

Seems like there should be a log of each parts measurement while going back together. Like bottom ring thickness x thousands, next ring x thousands etc... that way impending failure can be tracked and prevented once enoungh data has been collected.

[@blairkrukowski3806]

Excellently well-done instructional video........Unfortunately, camera placement and lighting prevents ANY visual clarity when showing the audience the details!!!

[@scoot77777]

Very nicely Done! Great video 🫡😊🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸

[@Bill3558]

It’s a pleasure to watch someone who knows what they are doing. Thanks for the video.

[@CucinaCottage]

Michael, Appreciate you sharing this information and explanation. Refreshing, unlike some other shops who like to build a mystery.

[@GravityKnightFlying]

cool stuff brother!

[@rpbishop3079]

Unfortunately, the people that are really interested in what you’re doing can’t see through your eyes or read your mind. Watch your own video keeping in mind you’ve never done this before, and you’ll be surprised. Put a simple cam on your visor or above your bench that you could angle at your press now and then. Watching someone perform magic or music is one thing, instruction is yet another. Your camera view should be nothing less than what “you need to see” to accomplish a given task. Anything less are not worth a thumbs up, let alone a subscription. “LET ME SEE WHAT YOU SEE, AND THEN TALK ABOUT”... and I’ll be back!

[@stolcreekaviation5507]

I can't say that I would promote someone doing their own gearbox work without Rotax training ( I know there are capable individuals out there but I still can't promote it) that being said this is not intended to be an instructional video as much as an informative video to show what is going on at the shop.

[@warrenjbrown4898]

Great explanation, great job, I had this done on my 912 awhile back here in Brazil. Nice music, too!

[@aviator267]

Great video. Love your workshop and the way you work

[@stolcreekaviation5507]

Thank You

[@DavidWebb-rz3vi]

Thank you for the video! I'm preparing to remove the gearbox from my 912ULS, then take it to a certified Rotax Repair Center for inspection or rebuild. After that, I will install it using the method you showed in the informative video! Rans S6ES Coyote ll.

[@serfrobles5514]

You did not show any of the press out / press in process. We watched you work. You didn’t really show us anything.

[@flat_stickproductions209]

Was that just a silicone roller? I usually put a bead on there but this looks much more professional and clean.

[@stolcreekaviation5507]

It was just a cheap hobby roller. I like it because it is a fast and uniform way to get the RTV on big pieces. And it does not fill up the places you don't want the RTV like in the bolt holes.

[@kevinmattson5236]

Excellent very informative!

[@stolcreekaviation5507]

Glad you enjoyed it

[@professionaldronmms1092]

Great Job. Do you see gearboxes out of tolerances or in bad conditions at 600 hr? I´ve read that this kind of inspection is mandatory at 1000 hs.

[@stolcreekaviation5507]

Most of the time things are OK, maybe a shim job. A lot of wear shows up soon if it has been doing a lot of idling.

[@randyvanvliet226]

@@stolcreekaviation5507 What rpm do you consider being above "idling" on a 100 HP 912 ULS? to minimize dog wear between the lobes? I'd think the 10.8 : 1 compression ratio tends to have more acceleration /deceleration per revolution than the lower compression 912 UL, so you'd want it to idle a bit faster?

[@stolcreekaviation5507]

@@randyvanvliet226 Every engine runs a little different on where it starts running smooth on warm up. Most of the time I target 2,500rpm for just sitting around.

[@savagecub]

Hey ! How much does that inspection usually run ?

[@stolcreekaviation5507]

About $800 if there are no surprises.

[@johnpro2847]

0:30 wish my car's transmission would come out this easily.

[@Curtster1962]

Question for ya. I hear 600 hours if the motor is run on “a lot” of avgas, 800 if on “some”, and 1000 otherwise. I’m the third owner of a plane with 570 hours, and the other owners “mostly used” auto premium. What’s your recommendation? Thanks!

[@stolcreekaviation5507]

The biggest thing in my opinion is making sure the gearbox is still shimmed properly. How much the engine has been run at low RPM where the gear box is chattering makes a big difference, flight schools are the worst about this. There is a dog ear friction test that can be done to get a gauge on how it is shimmed and getting a trend line with that is even better. Cleaning the lead out of the clutch pack is good but I have not seen it really bad after just 600hrs.

[@Curtster1962]

@@stolcreekaviation5507 thanks for the reply. I don’t notice chattering that everyone talks about, but it’s my first Rotax motor, so maybe it is there and I just don’t know it. Run it!

[@kkiwi54]

I've got a new gearset ready to go in my 912UL (no clutch) but not a new doghub. Should they be replaced as a set? 🤔

[@stolcreekaviation5507]

It is recommended but I wouldn’t say mandatory. The two gears are the only mandatory matched set. It would really depend on the condition of your old dog hub, you would hate to mess up your large gear right away with a badly worn dog hub.

[@kkiwi54]

@@stolcreekaviation5507 Thanks for that :)

[@rogerlarson8040]

Did you say Decaline is good to use?

[@stolcreekaviation5507]

Yes it helps keep the lead from building up in your engine.

[@radioace318la]

@@stolcreekaviation5507 The FBO (a local old dude) used that stuff often in his 172s and 152s. Said it would keep the lower plugs cleanEr. Question. What is the ratio of that gearbox? Say the engine is turning 2000 RPMs, what is the prop turning? Nice work putting this together and sharing it. Thanks!!

[@stolcreekaviation5507]

@@radioace318la The gear reduction is 2.43 to 1.

[@marknapier2236]

Can you explain how you adjusted the clutch?

[@stolcreekaviation5507]

I take the clutch pack apart, clean it, reassemble and reset the breakaway/slip tension.

[@the_worldoflive]

👍 Thank You! Sertificate 22-097