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 Clutch pull

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BrianD
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lcjohnny
GRiSO Capo
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lcjohnny

Posts : 409
Join date : 2016-01-25
Age : 66

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PostSubject: Re: Clutch pull   Clutch pull - Page 2 Icon_minitime1Wed Jul 14, 2021 2:49 pm

Well it doesn't work 🙁

The oberon cylinder is tight to fit due to both feed and bleed going to the same banjo-
Original
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Oberon
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But the main problem is that the Moto Guzzi clutch pushrod is pushed by a thrust cylinder which runs in a 26mm bore.
in this pic you can see the thrust cylinder.
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The slave cylinder enters the bore to operate against that thrust cylinder. The original piston is 25mm so there is no problem

The larger Oberon piston hits the back of the housing without lifting the clutch..

So it seems that I am stuck with the 8-10Kg clutch pull
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paulbrice
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paulbrice

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Join date : 2015-01-04
Age : 60

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PostSubject: Re: Clutch pull   Clutch pull - Page 2 Icon_minitime1Thu Jul 15, 2021 12:54 am

I'm guessing there isn't room to turn up & put a 'thin disc with dimple end' inside to match the OEM piston (or to just extend the pushrod out) ??
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BrianD
Don Abbondio
Don Abbondio
BrianD

Posts : 93
Join date : 2015-12-19

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PostSubject: Re: Clutch pull   Clutch pull - Page 2 Icon_minitime1Thu Jul 15, 2021 4:44 am

Appreciate the update, I still haven't got around to popping down to Oberon with my spare unit - really ought to. from what you have indicated the actual unit bolts on OK, but needs to
match the O ring seal [can't see that on parts diagram] unit to gearbox
Piston needs to match current
bleed need tapping out to banjo size
It may be that they can machine a piston to meet our needs?
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lcjohnny
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lcjohnny

Posts : 409
Join date : 2016-01-25
Age : 66

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PostSubject: Re: Clutch pull   Clutch pull - Page 2 Icon_minitime1Thu Jul 15, 2021 8:00 am

The thrust cylinder fits flush to the outer end of the gearcase before it is lifted - so hard to locate an intermediary there.  It is quite large, carries the radial bearing and was probably designed to take side thrust when the clutches used to be cable pulled.

If there is enough demand Oberon say they will machine pistons!!

However The double banjo bolt is so tight to the frame i could not even get 1/12th turn on it - so not possible to tighten it up Sad.

A new feed and bleed hose with a 90 degree double barb banjo to connect to the cylinder in the current position would work. But would add to the expense so that it might be cheaper to get the Brembo radial cylinders anyway.

Thinking about a 2 port cylinder as originally fitted Oberon said that as the bleed drilling is not absolutely perpendicular it would be unlikely to be fluid tight if it was drilled and tapped for the bleed hose. BUT if i can find an engineer to tap the thread and then spot face that surface it could work
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lcjohnny
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lcjohnny

Posts : 409
Join date : 2016-01-25
Age : 66

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PostSubject: Re: Clutch pull   Clutch pull - Page 2 Icon_minitime1Wed Jul 21, 2021 12:56 pm

Does anyone have a figure for the amount of clutch lift (so I can get the piston machined down) ?
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