Clutch Release (slave) Cylinder Advice

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Mickly
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Clutch Release (slave) Cylinder Advice

#1 Post by Mickly » Tue Jun 12, 2018 5:07 pm

Like peeling the layers away of a bad onion (1994 Triumph Trophy) I found evidence that the Clutch Release (slave) cylinder has sprung a leak.
Having disassembled it with the intention of replacing the seal, I have found a witness mark within the cylinder created by the bike being unused for 3 years (see photo) I can hardly feel it with my finger nail, would a quick wipe round with 1200 grit wet and dry to remove it be ok or am I looking at a complete (expensive) replacement?

P.S. if you ever do this, ferchrists sake be careful, I used a bicycle pump to pressurise the piston out, because it was slightly stuck it suddenly flew out at quite a rate, luckily I had it wrapped in rags.
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TimR
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Re: Clutch Release (slave) Cylinder Advice

#2 Post by TimR » Tue Jun 12, 2018 5:15 pm

soak in brake and clutch cleaner ...
remove as much of larger deposits you can with a non metallic scraper or even a soft wire brush ( brass )
then use fine grit paper to hone .
as the seal sits on piston it will give a bit more tolerance to seal if minutely oversized but don't gouge or heavily mark the faces .

and agree with piston popping ...
seen fingers split open on brake calipers where trapped between piston and caliper .
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Mickly
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Re: Clutch Release (slave) Cylinder Advice

#3 Post by Mickly » Tue Jun 12, 2018 6:33 pm

Ta for the advice, I’ll do that and replace the seal.
Won’t know if it works until everything is all together.
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Re: Clutch Release (slave) Cylinder Advice

#4 Post by fredc » Tue Jun 12, 2018 7:26 pm

one of these https://www.ebay.co.uk/itm/Brake-Cylind ... Sw~gRV6FAJ would be better than grit paper

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Re: Clutch Release (slave) Cylinder Advice

#5 Post by fastbob » Tue Jun 12, 2018 9:25 pm

I wouldn't worry about it , in theory there's no metal to metal contact , just contact between the piston and the seal so a little discolouration makes no odds . If you do want to polish it use 2500 grit paper dipped in a bit of light oil . If the surface of the piston is a bit ropey you can get a pattern replacement kit .

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