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View Full Version : Weird clicking sound when starting.


drzoidberg
08-04-2008, 12:00 AM
Hi all,

I took my rappy out the other day only to run into a snag. I had her all ready to go and when I began to start her there was this weird clicking sound. At first it was not bad and she fired up ok. Then she died. I tried again and the click was worse. I could not start here after that. The started shaft did not want to turn her over. I tried with my fingers and I could not turn the starter shaft. Long story short, took her home, pulled the engine out and checked the clutch, started shaft etc... I thought it was the one way.

I checked all the things over only to notice that the fan assembly had come loose and worked its way up the threads a little. I took it all apart and reassemble the unit ensuring there was adequate locktite. Everything looked good so I put the engine back in and all was good. Oh and I checked the one way and added some more grease. It looked fine.

I took her out again the next day and there was the weird clicking sound again. The heli stated and flew fine but whenever I start here there is a weird clicking sound, Its not the started I know this for sure. Its something in the starter shaft/clutch assembly. Is it possible the one way is really dead. If so I will need to buy a new clutch right?

Any help would be great.

Lota Fun R
08-04-2008, 01:01 AM
So, if your one way bearing is out then you need a clutch?


Get help from a seasoned pilot.

drzoidberg
08-04-2008, 06:37 AM
As far as I can tell the one way is part of the clutch. I did some further investigating and the noise appears to be coming from the engine. I was a little worried that perhaps something had broken inside the crank case so I pulled the engine out and gave it a once over. Everything seems fine so I put the engine back in the heli. I also checked everything else over again and all seems fine. I guess the noise is not really so much a clicking sound but more a popping sound which I believe is the sound this engine is making. I am pretty careful with my engines (old habits from my nitro truck racing days) soI amjust going to keep an eye (or ear) on the noise and see how she goes. By the way the bird flies fine its just a noise I have never heard before. Maybe I am just being paranoid. Thanks for your help anyways.

virtual120
08-09-2008, 03:17 AM
Ive got EXACTLY the same problem and still havnt worked it out. I too thought it was the one way bearing. Tried everything. If you get the answer, let me know and ill do likewise.

Cheers
Tim

nitrojunkie
08-09-2008, 10:11 PM
Check the pin in the tail rotor pulley it has most likely backed out and is lodged into the tail case.

damper
08-10-2008, 08:46 PM
If those suggestions does not work. I will check the belt might have loosen up and the clicking is the teeth
on the belt tighten the belt and put a piece of electrical tape on the tail tube insert back into
the frame and tighten back up. I believe that is the clicking sound you hear

drzoidberg
08-11-2008, 02:40 AM
I still dont know what it is. I am certain it is coming from the motor but I could be wrong.
I also have a sneaking suspicion it is coming from the starter shaft assembly. It is possible that the bearings in this have gone bad. I just dont want to have to pull apart half my heli to investigate. Is there an easier way to get to this?

progunpilot85
08-14-2008, 12:58 AM
clutch bell bearings are 1 possibility, could be bearings in the motor too, i just did a set on my .37

jgunpilot
08-15-2008, 09:24 AM
So, if your one way bearing is out then you need a clutch?


Get help from a seasoned pilot.

Too bad you couldn't help him. You seem pretty seasoned.

progunpilot85
08-15-2008, 04:09 PM
Yes, the one way bearing is built into the clutch, its only a $10 part so its no the tend of the world, while you have it apart i would also suggest clutchbell bearings if they havent been replaced, seeing as you'll already have it apart.

progunpilot85
08-15-2008, 04:10 PM
what raptor is this with what motor etc?

drzoidberg
08-15-2008, 07:36 PM
I am running the TT50Pro in my Rappy 50

bradh1963
09-01-2008, 03:47 AM
Hi all,

I took my rappy out the other day only to run into a snag. I had her all ready to go and when I began to start her there was this weird clicking sound. At first it was not bad and she fired up ok. Then she died. I tried again and the click was worse. I could not start here after that. The started shaft did not want to turn her over. I tried with my fingers and I could not turn the starter shaft. Long story short, took her home, pulled the engine out and checked the clutch, started shaft etc... I thought it was the one way.

I checked all the things over only to notice that the fan assembly had come loose and worked its way up the threads a little. I took it all apart and reassemble the unit ensuring there was adequate locktite. Everything looked good so I put the engine back in and all was good. Oh and I checked the one way and added some more grease. It looked fine.

I took her out again the next day and there was the weird clicking sound again. The heli stated and flew fine but whenever I start here there is a weird clicking sound, Its not the started I know this for sure. Its something in the starter shaft/clutch assembly. Is it possible the one way is really dead. If so I will need to buy a new clutch right?

Any help would be great.
Same thing happenned to me, the fan assembly came loose and has punched upwards. What it's done is created a series of flat spots on the two bearings creating that weird sound. Replace the bearings and all will be good

cheers

Brad

drzoidberg
09-01-2008, 04:33 AM
Thanks for the tip

bernoo
09-06-2008, 05:58 PM
your starter shaft isnt rubbing on the blade grip when starting is it? When Im not carefull I have a clicking issue when starting but it is the shaft hitting the grips.

drzoidberg
09-06-2008, 09:22 PM
Good point but no the blades are not rubbing.

I am pretty confident that the problem lies with the starter assembly. I just can not be buggered to pull it out to take a look. The only way I can see the removak of that thing is to pull the frame apart and that is quite a job.,

Thanks

Lota Fun R
09-09-2008, 04:10 PM
Too bad you couldn't help him. You seem pretty seasoned.

I wouldn't call myself a pro.

One thing I do know is that you need to use common sense and look at all possibilities.

Don't be afraid to take it apart.

The clutch and the one way bearing are two different parts completely, if the one way is bad, replace the one way, not the clutch. Make sense? The fan backing out/off sounds more likely. Does it have a governor? Magnet hitting sensor? There are so many possibilities!

The reason I say get some help from a seasoned pilot is because stuff like this is very hard to diagnose over the internet, an in person look at it is what is needed, and likely a tear down to find the problem.

drzoidberg
09-10-2008, 01:46 AM
Dont worry I am not afraid to take it apart, I enjoy building these guys more than I like flying.
I will take it apart and check out the starter assembly. I actually think that the bearings for the started assembly have gone bad. We'll see soon I guess.

Anyways I just want to thank you for all your advice.

Cheers.