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HomeAircraftHelicopterHIROBOOther › How bad did I mess up my Evo 50/Hyper?
10-12-2005 08:59 PM  13 years agoPost 1
lineofsight

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St. Louis, MO - USA

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Funny how small problems compound themselves on these heli's.

So, from the top:

I had some trouble starting my Evo; as in, it wouldn't start. After changing glow plugs, the same. So I figured I'd clean out the engine, carb and change fuel lines.

I couldn't drop the engine because the set screw on the starting coupler was in too tight; I bent two allen wrenches and broke a hardened hex wrench, even after heating with a soldering iron.

Then I decided to try to just clean it out the best I could while it was still mounted; this worked okay as the carb was easily accessible and I could take off the backplate.

Put it all back together, flew this morning and everything was great again. Until I landed to refuel. On the restart, the clutch/fan started slipping so the starter shaft would spin but the fan wouldn't; seems like symptoms of a loose prop nut. Then I noticed that while I was trying to get the engine out yesterday, I had loosened the bearing blocks holding the clutch shaft bearings.

That seems to explain how the prop nut / fan worked itself loose on the crankshaft during my one good flight, but leaves the question of how screwed up everything else might be?

So, running a tank thru with a loose bearing block around the clutch shaft / starting coupler, how much damage did I do? I guess I'm looking at a minimum of the two bearings for the clutch shaft / clutch bell pinion, but could it also have damaged the bearings in the engine?

I'd love to take it all down and look at it, but I don't have the time right now, and it brings me back to my original problem: I can't get the starting coupler off!

Any thoughts on what I might find and places to look for any other potential problems?

Thanks all,
Chris

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10-12-2005 09:23 PM  13 years agoPost 2
Donkey

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Punta Gorda, FL

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Ok. The fan is threaded on to the shaft. The bearing blocks you are referring to are the ones that pass through the frame right? So, There is only a couple of places you could be slipping. The most common area is around the starter adapter you can't get off. If you missed the flat spot on the shaft, this is probably your problem. The clutch bolts to the top of the fan hub with 2 Allen bolts. If these came out, you can drop the motor straight out the bottom. If the fan and locknut loosen up it usual prevents even the starter from turning, because there is not enough room for everything to separate and it all binds up. I have fought a few of those starter adapters and only once did I have to split the frames and dremmel it. The bearing blocks you are worried about are part of the frame so if they are damaged you will need to replace the frame. Frames are not too expensive ($25-30) but they are a lot of work. Don't get discouraged it is probably not as bad as you think.

Donkey you have the right to remain silent what you lack is the capability

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10-12-2005 09:25 PM  13 years agoPost 3
SolarXtreme

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Arroyo Grande, CA

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I am sure your engine bearings are fine. If they failed you would of heard strange noises while your engine was running. You might want to look at the clutch stack bearings but I am sure they will be OK.

I used to have problems dropping the engine on my EVO 50 due to a bad bearing on top of the clutch stack. If this happens next time just remove one side frame and you can pull out the whole engine assembly. Once you have the engine out heat the stuck set screw with a torch. If you have problems that hinder future maintance of the ship it is better to fix the problem rather than go around it. This way if you have a problem in the field you can drop the engine out with ease.
.

I picked a hell of a day to quit drinking

Avant EFX
Freya EVO

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10-13-2005 02:28 AM  13 years agoPost 4
joeskeeter

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South Georgia

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You can get a drill in there and just posibly
drill the set screw out, try not to damage the shaft of the clutch
and all you'll need is the coupler and set screw.

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10-13-2005 02:52 PM  13 years agoPost 5
Donkey

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Punta Gorda, FL

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Yes, The one I was forced to dremmel I broke a hardened allen wrench in. It is possible to drill the allen out while still in the heli throught the side hole.

Donkey you have the right to remain silent what you lack is the capability

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HomeAircraftHelicopterHIROBOOther › How bad did I mess up my Evo 50/Hyper?
10-13-2005 05:59 PM  13 years ago •• Post 6 ••
SolarXtreme

rrVeteran

Arroyo Grande, CA

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Remove the muffler and the four engine mount bolts and pull the side frame. It will save you a lot of grief and make it much easier to manage with the engine out of the ship. The Sceadu is very simple to maintain if you correct anything hindering the ability to remove any parts with ease. Chances are if you try to drill out the broken/stripped set screw inside the heli you are going to mess something else up. Get to know your ship and how to take it apart and reassemble it. The more practice you will learn little short cuts on how to repair and maninance the ship quickly.
.

I picked a hell of a day to quit drinking

Avant EFX
Freya EVO

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10-13-2005 07:14 PM  13 years agoPost 7
lineofsight

rrApprentice

St. Louis, MO - USA

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Thank you
Thanks for the help, guys. I finally managed to get the screw out. Special thanks to Donkey for laying out the failure points; you were right, it was the starting coupler slipping on the clutch shaft, not the fan being loose as I thought. Once I rotated (slipped) the coupler all the way around to the flat spot again, it relieved the pressure on the set screw. It didn't unscrew then, either, but I finally got a smart idea and tried heating the starting coupler rather than the screw with the soldering iron. I don't know why, I always heated the screw before thinking it would loosen the loctite, but really, it was just expanding the screw and making it tighter. Once I expanded the starting coupler, the set screw eased out pretty as you please.

Now, to find out if any of the bearings feel loose. And to reassemble with a little less loctite. And to lock the screw down at the right spot.

Thanks again all,

Chris

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10-13-2005 07:18 PM  13 years agoPost 8
Donkey

rrApprentice

Punta Gorda, FL

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Glad you got her sorted. <- My best shot at a British accent

Happy Flying

Donkey you have the right to remain silent what you lack is the capability

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