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HomeAircraftHelicopterHIROBOOther › Freya clutch & bearing stack assembly failure
03-30-2005 12:25 PM  13 years agoPost 1
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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The bearing stack above the clutch pinion failed recently, and the top of the pinion was very worn as it had been spinning inside the bearing race. I have replaced with new, but am having problems finding the right fit of components. This is a standard 90 Freya.

If the bearing stack, pinion and clutch bell are too tight onto the clutch, you get rubbing between the two top bearings and the pinion, and also between the small washer (2506-029) and the clutch bell bearing. Too loose, and the clutch bell vibrates and the pinion starts to drop a little out of the bearing race #2500-049.

I see that my new clutch came with a rubber o-ring, older clutches came with a single washer, while the instructions on RR show to fit both. So my questions are:
- should I fit the washer, o-ring or both (2506-029 and
2529-008)?
- how much "play" should there be in this assembly?
- should I loctite the pinion to the lower bearing race, and also the clutch shaft to the 2500-066 inner race to stop them spinning?
- any other tips for a long trouble free life?

Many Thanks

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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03-30-2005 12:54 PM  13 years agoPost 2
z11355

rrMaster

New England

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the original Freya only had the O-ring. the thin washer above it was
a later change. My hunch is that the O-ring was flattening out a bit.

I'd red loctite the pinion to the lower bearing inner race; not so sure
about the upper bearing-clutch shaft. Most of the time, I've found that
even red loctite or 609 doesn't hold up for the pinion (due to lack
of surface area I'd guess).

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03-30-2005 01:27 PM  13 years agoPost 3
I3DM

rrProfessor

Israel

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I never loctited the pinion into the bearing, because i never felt it was neccesary.
regading the O ring and washer, put the O ring on the clutch shaft, and then the tiny washer over it.
regarding play, the clutch bell should have about 0.5mm of up \ down play, mainly coming from the O ring's flexibility.

hope i could help, good luck.

www.liorzahavi.com

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03-30-2005 01:54 PM  13 years agoPost 4
Taipan

rrElite Veteran

Sydney, Australia

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I ground off 0.2mm off the top of the pinion on a grinding wheel. This prevents the pinion from contacting the inside of the upper bearing (for the start shaft.) As a result there is no longer a mark/groove on the shaft where the upper bearing is. (When idling, the stopped pinion would prevent the upper bearing from spinning with the shaft & leave a groove.)

Note this is not a problem on the Evo as the two bearings are separated! (being 2 different sizes may be a facor as well.)

Btw I red loctite the bearing onto the pinion as well.

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03-30-2005 03:03 PM  13 years agoPost 5
mrNoodles

rrProfessor

Borlänge, Sweden

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Dial indicating the clutchshaft will make those bearings lifes easier.

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03-30-2005 03:42 PM  13 years agoPost 6
Dr Lodge

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Guildford, Surrey - UK

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Thanks guys, all very helpful. I did re-dial indicate the shaft to within 0.002mm and I've got less vibration on the tail fin as a result.

I'm currently running with just the washer, so will replace with o-ring and washer if I can get the top bearing off the shaft!

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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04-05-2005 10:38 PM  13 years agoPost 7
Dr Lodge

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Guildford, Surrey - UK

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Well, I have reinstalled the clutch/engine assembly but replaced what looked like a thick washer (1.1mm) with a glo plug washer (0.6mm thick), and still had to open out the engine mounting holes in the side frames a smidge to lower the engine. I stuck the pinion to the first bearing with loctite 680 and the whole thing feels pretty free. I can move the clutch bell/pinion/bearing a tad as there is some play in the o-ring so I can't see this tightening up again.

Only a couple of days till the Charmouth fly-in so don't think I've got time to test it before then - so fIngers crossed!!

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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04-05-2005 11:55 PM  13 years agoPost 8
I3DM

rrProfessor

Israel

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glad you seem to have it figured out, but i never had to enlarge any frame holes.. and so does everyone i know.

www.liorzahavi.com

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04-06-2005 06:52 AM  13 years agoPost 9
mrNoodles

rrProfessor

Borlänge, Sweden

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Same here.

Is the bearings above the cluth fully seated?

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04-06-2005 09:41 AM  13 years agoPost 10
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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I had to open the engine mounting holes by filing perhaps 1/2mm off, this may be accounted for since the glo washer I used is 0.6mm thick compared to the original washer which I believe is only 0.3mm think. The washer fitted to my machine previously (with no oring) was 1.1mm thick!

I could still fit the engine without elongating the engine mounting holes, but the o-ring was a tad compressed and the main gear didn't spin 100% freely. Now it does, but it'll be interesting to see what fit the Freya washer gives, hopefully a friend has them in his order...

This is the main aspect I like about the new Freya Evo, as they have redesigned this clutch bearing assembly. The upgrade will require new side frames and pinion etc, I'll see how this fix lasts but hopefully it'll get me through the flyin at the weekend!

Thanks for all your help guys,
David

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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04-06-2005 05:43 PM  13 years agoPost 11
IDHoverman

rrApprentice

Jakarta-Indonesia

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Did you install any ring between the engine front bearing and the flywheel? With the collet type flywheel, no ring is necessary and this will shorten the whole assembly by about 1mm (the ring thickness).

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04-06-2005 08:38 PM  13 years agoPost 12
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Hum, not sure, I doubt it since a ring is not normal practice and its not shown in the instruction manual. I bought the heli second hand from a very knowledgable builder and when I overhauled the engine, I would have put it back with what was on it in the first place - which almost certainly didn't include the ring.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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