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Avant RC Nitro, Electric and FBL Avant Mostro, Aurora, Electric eAurora, RigidCore Flybarless Head, Avant EFX and Avant FX Helicopter Support


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Old 04-19-2012, 03:36 PM   #1
drewwy1
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Default Avant Aurora clutch drag

Hi all,

my avant has started to pick up drive to the head as soon as the engine is started even at very low revs and i mean revs so low that the engin ewill bearly run. I have changed the clutch drive, bell and lining and all is aligned perfect and spins free before starting the engine. before i dismantle can anyone please confirm that the problem is likely to be in the sprag? desperate to get this monster back in the air.

Thanks in advance.

Drew.
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Old 04-19-2012, 06:04 PM   #2
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That will not be the sprague. Have you changed clutch liner recently?
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Old 04-20-2012, 01:12 AM   #3
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Yes, I have got a new bell and liner that I fitted with epoxy. I have run a vernier on the inside and there are no high spots. I have also run a bit of fine paper around the liner join
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Old 04-20-2012, 09:09 AM   #4
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The tolerance is very close between clutch and liner when new. Spin main gear backwards and if you feel tight spots (which is liner dragging on clutch) lightly burn it in by holding head and bumping quick half throttle bursts 2-3 times. Should be fine after that.

Tom
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Old 04-20-2012, 09:12 AM   #5
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Thanks Tom, I'll try this method later and report back
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Old 04-20-2012, 09:23 AM   #6
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Check spinning the main gear backwards first. If you feel the drag (will feel tight the loose the tight) burn i like i mentioned just make sure you hold head very tightly! Do like 2 second bursts of 1/2 throttle
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Old 04-20-2012, 09:51 AM   #7
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Yes I got that, I know there's perfect alignment and the main spins freely no worries. I'm quite positive about your remedy and look forward to updating you later.

Many thanks

Drew
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Old 04-20-2012, 11:34 AM   #8
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Old 04-22-2012, 07:27 AM   #9
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Ok, I tried the clutch burn and this made no difference.
I have now replaced the clutch and removed a fair amount of liner with some fine paper. I have also completed a couple of burns and the problem still exists. This is now making me believe that there has to be a problem elswhere. Is it possible that there is an issue with the one way starter bearing causing the clutch bell to drag around this point. I think the next step is to repalce the starter shaft assembly and all bearings assosiated with this area.
Anybody else had any problems around this area?
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Old 04-22-2012, 05:25 PM   #10
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you have to push the clutch shoes inwards that'll take care of the problem.

when i emailed avant about the same they told me that the aurora clutch stays where it was last time so if you push it in and then run it it'll set itself to the best location by itself.
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Old 04-23-2012, 03:24 AM   #11
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Quote:
Originally Posted by FBLessOne View Post
you have to push the clutch shoes inwards that'll take care of the problem.

when i emailed avant about the same they told me that the aurora clutch stays where it was last time so if you push it in and then run it it'll set itself to the best location by itself.
100% correct. I always push the shoes inward with the rubber side of a pair of ball link pliers, and don't have any dragging issues once the liner is burnt in.
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