Re: Installing Shimano 7610 Track BB

On 17 Nov 2005 09:54:54 -0800, "mickster" <google@xxxxxxxxxxx> 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.
>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?

The gap between the flange on the left adapter cup and the face of
your bottom bracket shell is entirely normal for this bottom bracket
model. Its design accommodates the common window of variations in
shell widths from the nominal 68 mm. As you intuit, the supplied
O-ring will help protect the exposed face of the shell since the left
cup flange doesn't make contact with it.

Shimano literature indicates a torque range of 50 to 70 Nm for
installing these cartridge style crankbearing units.

-------------------------------
John Dacey
Business Cycles, Miami, Florida
Since 1983
Comprehensive catalogue of track equipment: online since 1996
http://www.businesscycles.com
-------------------------------
.

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