Jack f Posted July 28, 2014 Share Posted July 28, 2014 Hi all,In danger of asking a stupid question...In the process of stripping down my clutch master cylinder to replace the seals as it has leaked and the hydraulic oil is contaminated, the circlip, washer and push rod all came out nice and easy as expected. The problem is I thought the piston, spring, and valve shank would slide out too, but it hasn't. It moves in and out of the cylinder under the spring pressure well enough but any ideas on how to remove it fully from the cylinder? Looking at all the diagrams I can't see any reason why it wouldn't come out, unless the cylinder bore is burred causing it to stick?Any suggestions welcome! Thanks Quote Link to comment Share on other sites More sharing options...
junkuser Posted July 28, 2014 Share Posted July 28, 2014 Gunk in the bore.Push piston in and clean as well as you can. Detergent and water with fine wet and dry (600) on a finger.Tap cylinder, with progressive force, on a piece of softwood, in the direction you wish the piston to move.Can take time and considerable force. Hit down squarely to minimise chance of damaging end of cylinder.When piston level with end of the cylinder, gentle tapping on the edge of the cylinder or the reservoir should get the piston out far enough to grip to to complete the removal.Be patient! Quote Link to comment Share on other sites More sharing options...
nang Posted July 29, 2014 Share Posted July 29, 2014 Personally I wouldn't bother trying to fix the old one. New one's are cheap enough. Then you have no problems with corroded bores etc.Tony. Quote Link to comment Share on other sites More sharing options...
JensH Posted July 29, 2014 Share Posted July 29, 2014 Pouring boiling water on sometimes helps. Quote Link to comment Share on other sites More sharing options...
Rallyspit Posted July 29, 2014 Share Posted July 29, 2014 So does sticking it in a vice and screwing bleed nipples into both orifices, leave one nipple slack and give it a squirt of compressed air. Don't look down the cylinder as you do it though! Best to cover the cylinder end with a big soft cushion or similar - it can come out at great speed. Quote Link to comment Share on other sites More sharing options...
Jack f Posted July 29, 2014 Author Share Posted July 29, 2014 Done it! Sat it upright in a vice and let it soak in penetrant oil and just kept working away until the piston came out far enough for me to lift it out.Tried the boiling trick but no luck this time, although I have used it before on stubborn hoses etc and it works a treat.Cheers guys Quote Link to comment Share on other sites More sharing options...
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