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600 Class Nitro Helicopters 600 Class Nitro Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 09-25-2010, 03:59 PM   #1
Rob43
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Default Clutch bell runout

I saw somewhere on here that around .010 is a max value that shouldn't lead to performance problems for clutch bell runout. I just removed mine to reline the bell, and am looking at the assembly, and it appears as it rotates in the bearing block that it has around .015 or so. As I rotate it, the runnout appears to be in the pinion assembly. They both have runout together, almost as though the pinion assembly is bent. Is this really possible? I believe the clutch will true up and run pretty true when the clutch expands to mate the bell, but not sure it will cause vibrations with the starter shaft bearing assembly. I found this after the incident I had with it spooling up out of control on the ground. It shattered the main blades, but didn't seem to bend the main shaft or spindle. It didn't even bend the flybar.

Thoughts?
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Old 09-25-2010, 08:41 PM   #2
seanh
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all I've done is balance the fan hub and clutch...never worry about the bell. My bell actually deforms a little...probably due to clutch engagement. So as to run out, I don't worry about it since it appears to change, at least on my bird.
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Old 09-25-2010, 09:17 PM   #3
fastflyer20
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Check the clutch bearing housing, One of mine was worn causing excessive runout.
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Old 09-26-2010, 11:37 AM   #4
Rob43
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After cleaning the bell housing, and seeing this apparent runout, I dismantled the starter shaft, and loosened the housing to reseat the bearings and checked to see if simply reassembling the unit would make a difference. I no longer see the amount of runout I previously noted. When I first removed the shafter shaft, I could see the pinion and bell spun very true. Since the starter shaft has the drive lung which seats in the bearing at the top of the housing, it appeared that maybe my sharter shaft might have been bent. I didn't see any apparent problem with it, however. It all seems fine now.

Thanks!
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600 Class Nitro Helicopters 600 Class Nitro Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.

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