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Tightening nuts on inner gear box cover

Submitted by keith_dolbear on Saturday, 14 July, 2012 - 01:00
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Commando

I am replacing the kick start shaft on my Commando and struggledto undo some of the 7 nuts hold the inner cover on. They are so close to the casing that I could not get a socket, box spanner or even open jaw spanner onto a couple of them. I am wondering how to tighten them when I re-assemble. I notice that the manual quotes a torque to tighten to so that implies (to me) a socket will fit. Is there a special tool available? Ideas welcome, please!

No washers were fitted behind the 5 nuts inside the casing. Is it better to use washers? I could not see any shown in the manuals exploded views but it does not look right to me to not have washers.

Many thanks

Submitted by david_cooper on Saturday, 14 July, 2012 - 01:01

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I reluctantly took a valuable Whitworth socket to a bench grinder to remove most of its thickness for part of its circumference to get the outer cover off mine. I think the same socket then fits the inner cover.

As for washers - washers have various functions. If holes are oversize they provide the necessary bearing area for the nut or bolt head. If the material is softer than the nut (it usually is) they reduce friction as the hard surface of the washer allows the nut to turn, and prevents the corners of standard nuts from digging in to soft material.

But I'm fairly sure the gearbox nuts are specials with circular bases to keep the corners off the surface of the alloy. Just like the sleeve nuts under the front of the cylinder barrel. So no corners to dig in - and no need for washers.

Submitted by keith_dolbear on Saturday, 14 July, 2012 - 01:02

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Previously wrote:

I reluctantly took a valuable Whitworth socket to a bench grinder to remove most of its thickness for part of its circumference to get the outer cover off mine. I think the same socket then fits the inner cover.

As for washers - washers have various functions. If holes are oversize they provide the necessary bearing area for the nut or bolt head. If the material is softer than the nut (it usually is) they reduce friction as the hard surface of the washer allows the nut to turn, and prevents the corners of standard nuts from digging in to soft material.

But I'm fairly sure the gearbox nuts are specials with circular bases to keep the corners off the surface of the alloy. Just like the sleeve nuts under the front of the cylinder barrel. So no corners to dig in - and no need for washers.

Thanks David

Submitted by david_henshaw on Thursday, 19 July, 2012 - 01:00

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I have 2 wrenches and 2 sockets which have been modified so they will fit on these bikes.

Everyone who does their own wrenching have sacrificed a few tools to the bench grinder one time or another.

Submitted by colin_sharpe on Thursday, 19 July, 2012 - 01:03

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Weren't these nuts of the "Small hex" size, i.e. 5/15 BSCY thread with 1/4 BS hexagon nuts? If they are, then a 3/8 drive socket should fit without a problem. Of course, a lot of people butcher British bikes and "Modify" things to fit UNF threads. This always makes things difficult.

Submitted by karl_nixon on Thursday, 26 July, 2012 - 01:00

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Previously wrote:

Weren't these nuts of the "Small hex" size, i.e. 5/15 BSCY thread with 1/4 BS hexagon nuts? If they are, then a 3/8 drive socket should fit without a problem. Of course, a lot of people butcher British bikes and "Modify" things to fit UNF threads. This always makes things difficult.

 



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