Thanks for the very detailed and informative video. I am thinking of doing my own work when my gearbox needs inspection or overhaul and your video tells me exactly what I wanted to know about the process.
The propeller bearing does not have to be pressed in. the housing must be heated at the bearing seat then the bearing falls in. Pressing may damage the bearing if it is not squeezed properly. The bearing must be replaced after each disassembly, and when pressing in the propeller shaft, the inner bearing ring must be supported. read all in the Rotax 912 heavy maintenace manuale. I think it's great the people how you deal with the matter but others try to imitate and you have shown it wrong. I do not want to be a teacher but I do that almost every day in my workshop in Germany
Good video, but the way the propeller shaft was pressed it stressed the bearing and should not be done that way. The inner race of the bearing needs to be supported as you press the propeller shaft in. The MMH shows a detailed picture of how to do it, basically a pipe with an i.d. just over the shaft diameter, and longer than the propeller shaft, should be placed over the prop shaft and rest on the inner race of the bearing. That keeps the force from axially stressing the two races of the bearing. Doing it as done in the video puts a lot of stress on the bearing retention bolts as well, they're not designed for that kind of stress. I wonder if the propeller shaft was completely pressed into the bearing because there had to be some spring back from the bearing in deflection. It appears the gearbox was set on the press when the shaft was installed, which is also incorrect, thats a sealing surface and should not be placed on anything that could damage it, especially with the forces required to press in the shaft, it could cause an oil leak. I'm not one to criticise videos and I'm all for the DIY, I just know from doing hundreds of gearbox services that the way it was done in the video can cause damage. I wouldn't be surprised if the bearing is damaged, spinning the prop flange by hand you'd feel the bearing catching in 6 spots, equally spaced, one for each ball that made contact with the race. One other pointer, put the bearing in the freezer overnight, heat up the gearbox housing to around 200 and the bearing will fall right in the bore, no need to press it in.
The most common reason for damage on the propeller shaft is improper preventative maintenance. The slip friction test should be done every 100 hours, if the force is too low, the gearbox needs to be serviced. When it first starts, its just a few parts that need replacing, less than $100 in parts, but if it's ignored it damages the gear set and propeller shaft, with a final bill of around $4500.
Nice vid and very well presented with great detail. I would imagine the poor gearbox is being rattled to bits by a Rotax? You might considered a modern engine once the Rotax has rattled itself to pieces?
The propeller I was using at the time was a fixed pitch design. I was not getting the RPM that I wanted from the engine on takeoff. It was easier to change the ratio than send the prop back to the manufacturer for rework.
No, they use the engine oil. That's one of the reasons that using the proper oil in a Rotax is so important. It's basically a motorcycle oil with a gear additive.
dud you better you better read the user Manual as a hole. not just the specks your going to shorten the life of the overhaul parts you fitted and are going to. don't take it personal we are learning all the time
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
Thanks for the very detailed and informative video. I am thinking of doing my own work when my gearbox needs inspection or overhaul and your video tells me exactly what I wanted to know about the process.
Download the manuals from Rotax. They are free and very informative.
Thanks for the valuable information on the Rotax 912 gearbox!
Fantastic video. Thanks for the insight to the 912 gearbox. Much appreciated.
Really good video. Thanks for making the time to do this, for the benefit of others.
best rotax gearbox video period
Yes, thanks for posting and great camera angles, good stuff..
Thanks. My first how-to video. I'm still learning the video making process...
Excellent video, congratulations!
Great video. And yes, I will not repeat this at home, only in my Hangar 🤣🤣
Great video. I noticed you've got a much bigger balance tube between the manifolds. Why is this?
Thank you for your video, very interesting to see.
Very informative , thanks for posting :-)
hello mister. how many gearboxes x what is the diameter and how many small teeth and how many teeth? thank you
The propeller bearing does not have to be pressed in. the housing must be heated at the bearing seat then the bearing falls in. Pressing may damage the bearing if it is not squeezed properly. The bearing must be replaced after each disassembly, and when pressing in the propeller shaft, the inner bearing ring must be supported. read all in the Rotax 912 heavy maintenace manuale. I think it's great the people how you deal with the matter but others try to imitate and you have shown it wrong. I do not want to be a teacher but I do that almost every day in my workshop in Germany
Sky-Time at what temperature must you not exceed when heating the housing?
Mo Bessiere Heat it up to 212 Fahrenheit and cool down the bearing.
@@sky-timeaeroengines4059 Thank you. Most appreciated
Good video, but the way the propeller shaft was pressed it stressed the bearing and should not be done that way. The inner race of the bearing needs to be supported as you press the propeller shaft in. The MMH shows a detailed picture of how to do it, basically a pipe with an i.d. just over the shaft diameter, and longer than the propeller shaft, should be placed over the prop shaft and rest on the inner race of the bearing. That keeps the force from axially stressing the two races of the bearing. Doing it as done in the video puts a lot of stress on the bearing retention bolts as well, they're not designed for that kind of stress. I wonder if the propeller shaft was completely pressed into the bearing because there had to be some spring back from the bearing in deflection.
It appears the gearbox was set on the press when the shaft was installed, which is also incorrect, thats a sealing surface and should not be placed on anything that could damage it, especially with the forces required to press in the shaft, it could cause an oil leak.
I'm not one to criticise videos and I'm all for the DIY, I just know from doing hundreds of gearbox services that the way it was done in the video can cause damage. I wouldn't be surprised if the bearing is damaged, spinning the prop flange by hand you'd feel the bearing catching in 6 spots, equally spaced, one for each ball that made contact with the race.
One other pointer, put the bearing in the freezer overnight, heat up the gearbox housing to around 200 and the bearing will fall right in the bore, no need to press it in.
Did you assemble the prop shaft with a dry seal?
Great video - what Anti-Seize do you use ?
Great reference. Use lots of grease, grease is your friend!
Wondering how the shaft get damage ?
I have 850 hours on my 912ULS.
Regards
Martin Abud I have never been able to figure that out. I’d love to know.
The most common reason for damage on the propeller shaft is improper preventative maintenance. The slip friction test should be done every 100 hours, if the force is too low, the gearbox needs to be serviced. When it first starts, its just a few parts that need replacing, less than $100 in parts, but if it's ignored it damages the gear set and propeller shaft, with a final bill of around $4500.
what about the last bolt down next to the cooler right hand side. your not going to torque it
Nice vid and very well presented with great detail. I would imagine the poor gearbox is being rattled to bits by a Rotax? You might considered a modern engine once the Rotax has rattled itself to pieces?
why do you go from the 2.27:1 to the 2.43: gear set??
would the engine not rev, higher with the same prop speed??
The propeller I was using at the time was a fixed pitch design. I was not getting the RPM that I wanted from the engine on takeoff. It was easier to change the ratio than send the prop back to the manufacturer for rework.
Do those gearboxes need some sort of heavy oil?
No, they use the engine oil. That's one of the reasons that using the proper oil in a Rotax is so important. It's basically a motorcycle oil with a gear additive.
dud you better you better read the user Manual as a hole. not just the specks your going to shorten the life of the overhaul parts you fitted and are going to. don't take it personal we are learning all the time
THANK YOU FOR THIS VIDEO VERY HELP FULL av8r3400
Anti seize is not assembly lube, use engine assembly lube.
SpeedRacer 650 and many wrong ones!