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 Clutch Bell (inner) thread diameter and pitch?

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SilverFeather
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PostSubject: Clutch Bell (inner) thread diameter and pitch?   Tue Nov 15, 2016 5:41 am

Does anyone happen to know the thread diameter and pitch for the clutch bell outer.

I cannot bring myself to spend >£100 for a tool i will use once or twice in my life just to replace the clutch bell.

Thinking of potentially rigging something up. I managed to change all the bearings in the clutch using an automatic transmission spring compressor which was <£20 so i'm always looking for universal part substitutes Smile

Any help would be great!

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Cosmic_Jumper
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PostSubject: Re: Clutch Bell (inner) thread diameter and pitch?   Tue Nov 15, 2016 6:34 pm

IIRC it is 40 x 1.0 mm. Something only a machinist could match. 

The Silver Wing Club Italia (SWCI.it) had a "DIY" working drawing for the Clutch Bell puller as well as the reinstallation tool in their Technical Archives. But they seem to have recently remodeled their website and I can't find a link for these.

That said, a member here reportedly used a long 4-arm puller to remove the clutch bell. Just be sure to remove that "C" ring before hand. And whatever you do don't use heat; you'll only suceed in melting the final drive oil seal that the clutch bell mates with if you do.

Do let us know how you get on with this. We all benefit from shared information.

Tim
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SilverFeather
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PostSubject: Re: Clutch Bell (inner) thread diameter and pitch?   Wed Nov 16, 2016 5:42 am

Thank you Tim- great bit of information.

Yes i have seen the previous link to that but it appeared broken as you say. I will post up the spring compressor tool i used for dismantling the clutch too as i'm sure it beats paying the £$£$ for the honda tools.

would you happen to now how long the shaft is by any chance, so if i do go down the puller route i can make sure the arms are of sufficient length.

Thanks
SF
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SilverFeather
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PostSubject: Re: Clutch Bell (inner) thread diameter and pitch?   Wed Nov 16, 2016 7:06 am

Ok so i did  bit more digging on their remodelled site and found a few links

Clutch spring compressor home made tool: http://www.swci.it/silverwing400.it/index.php/31-fai-da-te/132-attrezzo-per-smontare-la-molla-frizione-by-skizzo
clutch bell PULLER: http://www.swci.it/silverwing400.it/index.php/31-fai-da-te/86-attrezzo-estrattore-campana
Clutch bell INSTALLER: http://www.swci.it/silverwing400.it/index.php/31-fai-da-te/87-attrezzo-inseritore-campana

This is the tool I used to compress my clutch spring so I could change the bearings inside:


Can be found on Ebay for $23 or £20 in the UK
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Cosmic_Jumper
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PostSubject: Re: Clutch Bell (inner) thread diameter and pitch?   Wed Nov 16, 2016 8:11 am

Thanks for finding those "lost" SWCI links. I'll have to bookmark them.

For the clutch bell INSTALLER I used a piece of 1 1/2" dia PVC pipe, a stack of large washers, and the OEM nut. It took awhile but the bell went on without a problem. The PVC insured that the threads weren't damaged.

For the compressor tool I used a piece of 1/2" "All Thread" attached to a metal plate as a base and a PVC domed end- cap with a section cut out of the side to access the clamp ring. IIRC the PVC end-cap dome was probably 3".

Good luck with you bell project

Tim
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SilverFeather
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PostSubject: Re: Clutch Bell (inner) thread diameter and pitch?   Wed Nov 16, 2016 8:51 am

Dont think I will be successful. The thread pitch is what's quite awkward about the tool. a very fine thread.
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