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A more useful clutch locking tool

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A more useful clutch locking tool

Posted by robert_haslam at June 07. 2017

The usefulness of the standard clutch locking tool can be extended to enable the primary transmission to be locked for maintenance without having to resort to using the back brake with the bike in gear.

 

The 3 photos show the modification to the locking tool. Not much science involved, just careful siting of the 4 holes such that, when the tool is in position in the clutch basket, there is socket access to the clutch centre locking nut, (see tool in place photo).

 

It was made up from ‘stuff’ I had lying around, namely a couple of 29mm exhaust clamps and the handle is square section steel bar.   The 8 nuts on the front, under the clamps, are oversized on the clamps and act purely as spacers to give sufficient projection so that the handle clears the front of the clutch basket.  At the rear, the clamp's threaded ends are sawn off, but left long enough to butt up against the rear of the clutch housing, (that's 15mm from the rear of the tool). This enables the tool to be held squarely in the clutch basket. The projection from the underside of the handle to the front of the tool is 24mm. These measurements are intended as a guide but they do bring the tool close to the front of the clutch basket whilst still engaging fully with the clutch centre splines.

 

With the primary drive complete, the handle gives enough leverage to enable the clutch and the crankshaft nuts to be loosened or tightened. It also makes it easy to turn the engine over quite precisely for valve adjustments or finding TDC since it takes only a few minutes to remove the clutch plates and fit the tool.

Attachments

Re: A more useful clutch locking tool

Posted by George Phillips at June 08. 2017
That's very interesting, Robert. Is the clutch plate re-usable after the tool is dismantled?

Re: A more useful clutch locking tool

Posted by George Phillips at June 08. 2017
BTW - this thread would sit comfortably in "Nortons - General" as all Norton clutches are similar. It would reach a wider audience. George.

Re: A more useful clutch locking tool

Posted by christopher_winsby at June 08. 2017

If the plate was used in a clutch it would make stopping interesting as it is a locking tool. I have done similar but with spacers and a 3 foot bar

Re: A more useful clutch locking tool

Posted by ian_cordes at June 08. 2017

George. Commando clutches are completely different from all other Nortons before it. Just look at the picture 'tool in use'.

As for re-using a locking plate, surely you can't be serious?!  I know, I am serious, and stop calling me Shirley.....Laughing

Re: A more useful clutch locking tool

Posted by George Phillips at June 08. 2017
Quite right Ian. I was looking more at the tool that the clutch. But I meant at a general level surely the tool could be adapted for a "non-Commando" clutch?

Re: A more useful clutch locking tool

Posted by ian_cordes at June 08. 2017

George. It would need a double sided plate locking tool which would fit the regular Norton clutch basket. RGM do them, part # 067227; £16.90 + VAT.  The Commando version is #061015; £12.90 + VAT

Then you could make your own, using the principle which Robert has outlined, but with dimensions amended to suit the different application. Roberts tool could not be adapted for an AMC or laydown set-up, but it uses an established principle, usually done by welding a long bent bar onto the locking plate of whichever make of bike/clutch you are working on. The nice thing about his description is that it provides all parts and measurements required to fit the Commando clutch, without the requirement to have welding equipment to hand.  Ian

Re: A more useful clutch locking tool

Posted by robert_haslam at June 08. 2017

OK guys, seems that I am 'behind the curve'. The clutch locking tools obtainable from Andover Norton now sport a handle. I bought mine about 20 years ago and, at that time, it was just a plain disk and not particularly useful.

Ian, you have beaten me to the punch, thanks for supplying the part nos. and prices from RGM.

Andover Norton 's prices are:

06.1015
CLUTCH LOCKING TOOL, COMMANDO
17.80 £ excl. VAT

06.7227
CLUTCH LOCK TOOL (DOMINATOR & ATLAS)
16.25 £ excl. VAT

Commando version is considerable more expensive from AN

Guess that there isn't much more to say on this subject!

Bob

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