CB550k1 US Import - UK registration

[Oddjob]

Been thinking about this and I still think it's flat side up, I think it's that way so when the sprocket carrier goes on it doesn't risk flipping the o-ring out of the groove as it gets pushed back.

[Sesman]

Mine was flat side up on disassembly. I’m pretty certain the  wheel had not been dismantled previously and would suggest that’s how it should be.

[Nurse Julie]

Flat side on the hub.

[Oddjob]

Flat side on the hub.

So you think flat side down?

Yet Phil says flat side up and was born out by seeing that was it way it came apart. I'm more and more convinced that I remember it being flat side up. If not why have a flat side at all, just use a normal round O ring.

Maybe someone who's taking a wheel apart soon can report back and solve the mystery.

[Seabeowner]

This was discussed a while ago here.
Surely the location in the hub will shoe either a flat or a part circular groove.
Sure Julie is correct.
See pic and Enry's comment here. reply 7

https://www.sohc.co.uk/index.php?topic=27593.0

[Oddjob]

Then why is the groove around the camcover flat when the o ring is round, until someone opens a hub up and lets us know exactly which way round it is we’ll not know for certain.

[Nurse Julie]

Then why is the groove around the camcover flat when the o ring is round, until someone opens a hub up and lets us know exactly which way round it is we’ll not know for certain.

Graham has just opened a hub for Roo. I'll take a photo in the morning. Graham must have fitted maybe 50 of the D rings over the years and I'm sure he remembers which way up they fit.

[Sesman]

I’d say that was conclusive evidence.

[Oddjob]

Well let’s hope the pic settles the debate once and for all.




Unless of course someone has already replaced the o ring and got it wrong. 😁😁😁😁

[Laverdaroo]

A pal rang me yesterday and said he was rebuilding his rear wheel so I suggested bobbing round so we could mueller it at mine as I have a bit more space but more so to take the enclosed. His hub has NEVER been apart so from factory as follows………


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[Laverdaroo]

Flat side to hub as you would have assumed, or I would have anyway.


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[Oddjob]

That sliding surface looks very dry. How's the corresponding surface on the sprocket carrier?

[Laverdaroo]

That was hammered out witha apiece of hardwood as it wasnt coming out at all,  the factory grease was bright orange and completely hard, hence why I suspect its the original. The whole thing was parched Ken. He's rebuilding the wheel so its getting fettled but the hub was well in there. The surfaces arent bad but arid dry so god only knows where this has been stored.
 He's doing a bulld but has little space so we did it at mne. He paid £165 for a complete wheeel but pretty much junked the rest and building from scratch like I'm having to do.

Funnily enough,m the seal is in really good nick and is more than likely reusable in his case.

[Oddjob]

You do realise that as the sprocket carrier came off it could have flipped the seal 

Just as a matter of interest when these seals come off they tend to revert back to whatever shape they were manufactured in, if you flip them so in effect the inside is out and the outside is in they will try and flip back to standard. Have you tried doing that? Just as an experiment.

[Sesman]

I’m leaning towards the rounded profile being outer. It kind of makes sense: as the two parts close the high point of the round profile will compress creating the seal…..just saying.