Raptor 90se squeek

[vernon7026]

hey all

Got a rappy 90se which i have mentioned before in previous threads !

My main gear went on the weekend( Dont know why) and so i stripped it and took the starter shaft out ! I have had this squeek when cranking the engine, and i believe it would be the oneway bearing in the clutch, all the bearings in starter shaft seem ok ?

Would the one way bearing cause this dreadful noise ?

any ideas please ??

Regards

[vernon7026]

I it worth spreading one way grease inside the clutch one way bearing ???

Let me know what you think ??

[fixnfly70]

I wouldn't think the oneway would squeak during cranking, as this is when it should be locked up on the shaft - unless it is worn or the bottom of the starter shaft is wore a bit. then it slips a bit and squeals like a stuck pig. I had a 50 that did this, and replaced the clutch shoe/oneway bearing and it went away.

[CrazyJim]

Hi Guys,

I seem to have the same issue on my 90SE

When cranking the motor to start it makes a noise like a dry metal graunch screach. It seems to be when the motor comes on to compression. Does not make the noise with the plug out and turns over fine.
The clutch inner is new.
Starter shaft is new.
Bearings are new.
Motor bearings are new.
New Align starter stalls when used to start the motor.
Once started the motor runs fine with no noise except for what you expect.
The noise is like when a drill bit slips in a drill ???

Any suggestions would be appreciated. I've had the motor out twice now with no indication of what's wrong.

Jim

[maizor]

I have had the same issue with my Rappy for a while now and my solution was to change all bearings and starter shaft (not the on way bearing) . And made sure the line up off the motor and starter shaft was straight.

Have not had any bad sound after that.

[CrazyJim]

Thanks for the pointers gents.

I ended up taking the motor out again.
This time I used my starter directly on the one way bearing at the clutch using a spare starter shaft.
The same noise was made with the new shaft.
I can only put it down to the overrun of the motor after compression releasing the one way bearing under load causing a noise.
It is less noticeable with the motor outside the bird than in.

Interestingly enough I used an old starter shaft on the first test and it made no noise.
The old shaft had some indentation grooves that come with frequent starting.

Maybe this noise is not unusual. I certainly don't get it on my 30 or 50 rappy.

My suspicion is that if the one way bearing had a row of rollers as well as the cams the noise would not be there.

The noise was different depending on what I lubricated the one way with.

Anyhow that's my findings.

Crazy

[ntwaddell]

i have the same issue with mine. i ordered a new starter shaft and one way bearing. hopefully that will fix it up.

[CrazyJim]

I hope that works for you. I still have had no luck getting rid of the noise so now I just put up with it. Gets some looks at the field when starting though.
I'm pretty sure that one way bearing is undersize for that torque. You will, no doubt, have noticed that the starter shaft is the same for the raptor 30 as the 90.....makes you wonder eh.
Be interested to see what result you get from the new parts.

Just ordered the X50....sure hope that doesn't do it too


Ian

[TCipolla]

My 60 size makes an awful noise too when I start it on the first flight of the day. After that it seems to go away, but I feel like I'm gonna break the heli when I start it the first time.

[AzChopp3r]

My 90SE does the same thing.

I noticed that the starter shaft had play up and down which is due to the starter coupler slipping up a little on the shaft. I think what is happening is that this play allows the shaft to drop down a bit allowing the c-clip to spin on the clutch bearing making an ugly noise. After removing the coupler, pulling up on the shaft and reinstalling the coupler without pushing the shaft back down and tightening, the noise is gone.

[CrazyJim]

Immediatley stepped over to my 90 and checked the play and there was none.
Probably the only time I would like to see play in my heli

However that does not mean that the E clip isn't be hard against my one way so I wll pull it down again and check this and post my findings. Maybe my whole motor is a bit too far up. I will look for any marks from interference.

Thanks for the heads up on that AzChopp3r

Ian

[maizor]

I am checking this as well. I only have this sound in one of my Raptors the first one went away when changing the bearings. But maybe the E clip was the issue there as well

[ntwaddell]

replaced the shaft and clutch. problem solved!

[CrazyJim]

Well done that man

Aaargh I did the same earlier but had no result.
Might have to try all these things again

Ian

[DenisFerrari]

Originally Posted by CrazyJim

Hi Guys,

I seem to have the same issue on my 90SE

When cranking the motor to start it makes a noise like a dry metal graunch screach. It seems to be when the motor comes on to compression. Does not make the noise with the plug out and turns over fine.
The clutch inner is new.
Starter shaft is new.
Bearings are new.
Motor bearings are new.
New Align starter stalls when used to start the motor.
Once started the motor runs fine with no noise except for what you expect.
The noise is like when a drill bit slips in a drill ???

Any suggestions would be appreciated. I've had the motor out twice now with no indication of what's wrong.


Jim

Hi all, just test flown today my Raptor 90 rd with Os/Align 91 and it simply flies beautifully, as good as my other I.c. Trex700N hely. I'm so happy on how the test flight went, everything perfect ... But only one strange worrying issue : the same squeak metal to metal bad sound when starting up...
As soon as the engine starts, no more problem and everything's perfect.
AI've noticed it happens as soon as the engine start to be hard with compression ... With less compression no bad sounds.
I'm using the align hey starter (same using with my trex700n) and it seems to struggle quite a lot to make motor start up ... With those sounds.
Please help!!!
Denis

[DenisFerrari]

Just greased the one-way with Align one way bearing grease, I really hope it can help. Let you know just after next flight session.
Cheers
Denis

[DenisFerrari]

Hi, just had a quick flight session yesterday even if very cold (3deg/C) : after have put some Align One Way Gearing grease inside the one way itself the squeak reduced a little bit but did not go away. Also, still difficult to start the engine with Align starter ... Same starter I'm using in the last year or more with may trex 700n, that has the same exact engine too. Maybe my starter battery going bad? What I also noticed is that the Align starter after 1 or 2 seconds goes on safe stop (all led blinking) and then I can push button again to try to start the engine and so on. Nothing bad on the engine, since once it's started it's starting to run quite well with no problems at all. Of course still on rich side since it has only 5 flights.
Summary is : still squeak sound while trying to start engine up, but no problems after that.
I think I'll just keep an eye on that and go on trying to understand why I'm starting to have problems on my Align hely starter. I've used it for about 100 flight (and start-ups) with my trex700n, same Align/Os91 engine, until now with never 1 single safe stop issue ... Maybe the new engine on the raptor has some more compression than the other one because it's so new?
Any idea and suggestion on squeak sound and on my actual Align starter problem starting up the raptor 90 is very well appreciated
Wait your suggestions,
All the best and thank you very much to all,
Denis Ferrari

[TCipolla]

Hi Dennis,

Is your starter having trouble turning the engine over? If that's the case, it could be your starter, or it could be the engine is flooded. If you suspect it's flooded, tilt the heli on the skid towards the muffler and try to start it. Always seems to work for me. Hope this helps.

[DenisFerrari]

Originally Posted by TCipolla

Hi Dennis,

Is your starter having trouble turning the engine over? If that's the case, it could be your starter, or it could be the engine is flooded. If you suspect it's flooded, tilt the heli on the skid towards the muffler and try to start it. Always seems to work for me. Hope this helps.

Hi, no the engine was not hydro-locked, I think the problem has been with Align starter, bay be it was very cold and battery efficiency went down ... But I also had some smoke coming out from the starter push button while letting it run freely, without applying to the hely starter shaft... With some bad smell.
Then after that, smoke stopped and the starter continued to run. Double check the battery and the smoke did not come fram that, I think it came from starter PCB ... But why when running the starter freely ... Sso strange
Just ordered a new PCB for the starter...

Let you know.

Any other suggestion is highly appreciated

Regards
Denis

[rctrooper1]

Hey guys,

I had the same problem on my Raptor 90 gasser and found that I was missing the thrust washer that goes between the bearing inside the clutch bell and e clip on the starter shaft...problem fix and no more squeaking. The missing thrust washer was giving the starter shaft up and down play....

Jz.