Clutch Slave cylinder o-ring

hooksey

hooksey

Hero member
Location
Vic , Australia
Fellas, im in Aus anyone know where i can pick up one of these o-rings.

Is this the right size 30 + 4.5 + 39 EPDM ?

Bearing shops have them in NITROL but not EPDM ???? bugger

Hooksey.
 
You can get them, but often have to order in.  I get mine from CBC but any decent bearing shop should be able to get them for you, usually overnight.
From memory I thought I used a 3.5 section ring - ie 31x3.5 for the later pistons.  I think the earlier bikes had 30mm piston so possibly a different size groove too.  Someone will soon confirm no doubt. 
Cheers
Steve B
 
Thanks Steve,

CBC Melb getting me one o/nite Couldnt get a EPDM Because of size 30 + 4.5 +39
but they could get me one in VITON , they assure me it will be ok with brake fluid ??

Anyone used Viton rubber o/ring for clutch slave ?

Hooksey
 
They are talking shit !!!  :o
I tried the VITON o-ring in the clutch cylinder on No 2
it melted due to contact with the brake fluid

change your fluid, there is no valid reason why the clutch fluid needs to be brake fluid
but you will need a very low viscosity fluid
ATF will work, Automatic Transmission Fluid, or a very light grade of fork fluid maybe

I'd change to ATF on the clutch circuit

HTH
Red


 
Buggers,

Dont ya hate a bullshit artist , just trying to flog shit to turn over the register.

Nothin like having an experienced hand on site to set things rite. Cheers Red !!

Will make a point of telling him his full of shit tomorrow.

Will look into the Auto Trans Fluid ... with the VITON o/ring.

Hooksey.
 
I can see the advantage of switching to light oil, although am wary of the continuity problems later down the track if topping up and use the wrong fluid etc, does it turn to jelly?  No idea.  A problem magnified if you have multiple seldom used bikes, like many of us do.
Myself I would just try find a better bearing shop who will get you the EPDM ring, that is unless time is an issue.  If swapping to oil, I would want to strip and thoroughly clean the master cylinder and line though.

Cheers
Steve B
 
I went through this issue just a few months back.  There was a wealth of info posted on material compatibility with brake fluid, the pros and cons of using other fluids, etc. Surely someone more adept with computers than I could bring up that threat here.
 
So , what did you do Lawrence ?  Stick with brake fluid ?  What type of o/ring EPDM or Viton ?

I have picked up a Viton o/ring, just want weight of numbers to say put in in or piss it off .

I dont know,,,, the bearing shop says Viton and Epdm are compatible to the same sort of

stuff they can be imersed in eg; brake fluid... Yet Reds had first hand experience which tells us
otherwise .

Cant find a supplier to get an Epdm type in that size  30  /  4.5  /  39

Maurice thanks for the offer is yours an Epdm type?

Hookesy,
 
have you tried your local brake and clutch shops, most carry a broad range of parts to cover anything that comes in the door.

vlad.
 
Someone else originally posted this link:

http://www.marcorubber.com/materialguide.htm

it does say that EPDM is O for brake fluid but viton is not.

bazzee
 
If you want to switch to something other than brake fluid, new BMW's use mineral oil for the clutch.

Also I have found it extremely difficult here in the US to find metric EPDM O rings. I get my O rings from Wolfgang but have no idea what material they are.
 
I looked at every bearing shop in the vicinity for an slave cylinder o-ring in EPDM and came up short.  I was able to get the proper size in a Viton ring.  I subsequently limped home and by that time Wolfgang's proper replacement had arrived.  I installed it and filled the system with DOT 4 synthetic brake fluid -- reportedly to be safe for all systems.  It's a Prestone product if memory serves. I now keep a space o-ring in the little cubby behind the Mirage's saddle.  I don't wish to repeat that fiasco I had in Reno ever again.  It ruined some nice riding through the Sierras that week.
 
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