Alexander01
Senior Heliman
Location: Sweden
| Hi MA experts!
I experience some kind of vibrations, that are mostly indicated at tail boom area, but even throughout the whole frame. I use YS91SR @ 1850 rpm (tryed changing rpm from 1780 to 1900 with no positive result). Total fan runout is 0.001''.
Both screws, that hold boom supports, worked themselves out of horizontal tail boom clamp, now there's not enough plastic for screws to hold themselves in place.
I believe it's engine related, as after I've hitted throttle hold switch, all the vibrations stop. Another issue that is pretty strange is that while turning the main gear by hand anti-clockwise against the pinion, it doesn't turn smooth, some uneven friction is present, but if you turn starter shaft say a halv turn, than it could become smooth. I disassembled the frames yesterday (separated lower from above) and tried to figure out why it behaves in that way.
I've found out that it's possible to reproduce that effect without the engine present. I thought that the clutch bell assembly and lower clutch block assembly are self-aligned (as there are no possibilities of doing it), but may be it should be done in some other way?
One more thing, if you remove the rubber o-ring, that goes on the bottom of starter shaft, everything is then smooth, with no friction.
But then, if the o-ring is not there, the clutch bell could simply fall down on the clutch.
Or could my starter shaft/clutch block be bent?
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