Re: Installing Shimano 7610 Track BB


mickster wrote:
> I'm about to install a new Shimano 7610 Track bottom bracket - this is
> the BB for the older generation square taper D-Ace track cranks. The BB
> is English sized going into an English BB shell.
> Having installed the drive side cup and BB unit and torqued it to 50Nm,
> I'm having a problem with the left side cup - it screws in ok most of
> the way but then stops approx 1-2mm short of its full insertion, ie
> when tightened there's a 1-2mm gap between the left edge of the BB
> shell and the l-hand cup. It's not a question of further tightening
> because the axle starts to bind if tightened any further.


Tightening the cup should not cause the BB to bind. It is like most all
other cart bearing shimano BBs, but with steel cups. I would chase the
frame BB shell threads and face the right side of the BB shell. It
should not bind regardless of how tight the cups are.


> The left hand cup does come with a rubber o-ring which suggests that
> this gap might be intentional and needs to be covered with the o-ring,
> but this seems like a strange design if that's the case. Removing the
> BB and comparing its overall width to the BB shell, it does seem that
> the BB-plus-cups is 1-2mm wider than the BB shell.
> The BB is definitely English (cups are English threaded and BB body has
> NJS logo).
>
> Is this normal for this BB or am I missing something? If it is normal,
> how hard do I need to torque the l-hand cup to ensure it's a tight
> enough fit?
>
> Many thanks,
>
> Mickster

.

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