question about starter shaft....

[matador_24]

Hello, my bell cracked and I must replace it, the starter shaft have some play so I'll replace it as well. I didn't put together my raptor 30 v2 so, I am trying to follow the instructions but..... following the instructions of the manual, the pinion goes into the bearing and then the bearing into the frame and then I pass through the starter shaft with the clip and I put the starter coupling with the 2 screws.... is that right???? what I don't understand is.... once installed... what does prevent the bell from coming out of the bearing????? the clip of the starter shaft and the starter coupling??????

[vandelescrow]

If you already read what was in this post forget it. I was thinking the R90 build. What holds the bell from sliding up and down is what you thought, the e-clip and the starter coupling.

[capebob]

You are correct. The bearing goes on the pinion. Put a little bearing retainer (Loctite 680)on the the pinion if the bearing to pinion fit isn't tight. Next screw the clutch bell onto the pinion. You do NOT need to use thread lock here. This will facilitate clutch bell removal without splitting the frames if need be. Install the top bearing in the frame and then install the clutch bell/pinion assembly into the frame. Next put the "C" clip on the start shaft and install it from the clutch bell side up through the clutch bell and pinion. Then push it all the way up through the top bearing. Then the starter coupling is installed. make sure that there is no vertical play in the start shaft. When you finish assembling the frames you will notice that there is some side to side play in the start shaft. This is normal and will disappear when the engine is installed.

Bob

[matador_24]

Thanks for the answer guys, I finally know how it works.... thanks!

As I said before, I am replacing the bell because it cracked on fly...

1. why do you think that happened??? is it normal or just bad luck? well, as it was cracked, I just removed the pinion with some players and it was stiff but I got the pinion off. Now the problem is to remove the little part of bell along with the bell bearing that the pinion still has (by the way the bearing is stuck, it was like that before I removed the pinion, it won`t turn, the starter shaft was spinning without moving the bearing I guess). I don`t have an electric drill to make a whole at the top to hold it or something. I tried with 2 players (with tissue in between to prevent to damage the pinion) but I damaged "slightly" the pinion and I stopped. hehehehehe, it's not bad, I damaged maybe 3 teeth but really slightly, you can barely see the damage,

2. do I have to replace the pinion also now or I can just sand the damage part to make it flat and I use it again?? how bad a pinion can be to become useless?

Maybe it`s just easier to get the new pinion, the bell is destroyed anyway....

[capebob]

The main cause of a ruined clutch bell is that the washer that comes with the engine is used. You must not use any kind of washer between the engine and the fan. The bottom of the fan is properly shaped to ride properly on the engine's front bearing. With a washer in place there is insufficient clearance between the clutch and bell.

If you can remove the clutch bell remnants from the pinion and the threads look OK then you are good to go. If you have any question about the condition of the pinion it's best to replace.

Bob

[matador_24]

Hello, thanks for answering. I don't have a washer in the engine. I have no idea why the bell cracked. I bought the raptor used and I hope it cracked because of the use.

I finally was able to remove the remanent of the bell off the pinion. The threads are ok, I just slightly very slightly chipped one of the teeth of the pinion (maybe 4mm long for 1mm deep in a triangle form). I am going to sand it until it looses the sharpening. It is the only thing it is not in stock where I bought the parts that I need (bell, bell bearing, starter shaft), so, I'll use it like that again, hopefully it will work ok, if I see that it makes weird noises while running with the main gear, then I'll replace it.

Thanks for the help, if you guys have any comments, tell me... thanks!

[brunobl]

I just slightly very slightly chipped one of the teeth of the pinion (maybe 4mm long for 1mm deep in a triangle form).

If you chipped off a 4mm by 1mm chunk of a pinion tooth, it's best to replace it, as you risk damaging the main gear. By the time you hear strange noises and decide you should change the pinion, the damage may already be done. Besides, since the heli is already disassembled, now is the the most appropriate time to do that, as you won't need to take it apart again.

Always keep the heli in top condition. Do change that pinion!

[matador_24]

I ordered the pinion in another Hobby store, I'll pay 13dlls shipping for a 7dlls item, grrrrrrrrrrrrrr....
Anyway, it's done, I hadn't measured, the chip actually measures 4mm long x .3mm deep, do you think it's still that bad if I sand it until it get smooth? I am sorry for asking stupid question sometimes but I am new in nitros and I am learning :) I have a t-rex 450 and it's way less trouble for me, actually I damaged way more the pinion of the t-rex while replacing something once and the heli flies great, it just makes a weird noise but I have had about 50 flights without problem, main gear is in perfect conditions

Thanks!

[vandelescrow]

Did you say you have a locked up bearing on the starter shaft? If so you should replace that also.

[matador_24]

the bearing that is locked is the bell bearing, I ordered a new bell and a couple of bell bearings. The other bearings are ok. I don't have lots of time right now to split frames but I am planning to do it some day to replace the main bearing and the start bearings. But for now, I checked them and they look pretty good. :)