Hoolz Posted September 28, 2007 Share Posted September 28, 2007 I'm trying to repair mine but have become completely stuck. Everything's been straightforward so far. It's removed from the car and i've removed the circlip holding the piston rod and washer in place.This is where i'm stuck. How do i get the piston out to replace the seals?The Hayes manual says to do the following: With a small electrical screwdriver lift the tag on the spring retainer which engages against the shoulder on the front of the piston shank and separate the piston from the retainer.I cant see any tag on a spring retainer. I can't see a spring retainer. All i can see is the 'front' of the piston and when i push it in i still cant see anything else. I've been poking around with a tiny precision screwdriver but there's no tag anywhere that i can see to lift. Link to comment Share on other sites More sharing options...
CharlieB Posted September 28, 2007 Share Posted September 28, 2007 The bit about the tag is for after you've got the piston out.To get it out lubricate the bore with a little brake fluid & push it in several times, each time it should spring back out a little further. If that doesn't work after a while bash the end of the cylinder on the (wooden) bench & it should come out. Link to comment Share on other sites More sharing options...
junkuser Posted September 28, 2007 Share Posted September 28, 2007 The quote applies after you have removed the piston.To remove the piston remove the circlip and washer as you have done then scrape any junk off the bore between the piston and the end of the bore. Next tap this end of the cylinder firmly with a piece of hardwood to cause the piston to move back. sometimes you have to push the piston further in to clean this part of the bore and repeat the process. Link to comment Share on other sites More sharing options...
Hoolz Posted September 28, 2007 Author Share Posted September 28, 2007 Cheers for that Charlie.Now that i know, i'll give it a good thump. Link to comment Share on other sites More sharing options...
Hoolz Posted September 28, 2007 Author Share Posted September 28, 2007 Thanks as well Junk. so if i push the piston in and out with a wooden spoon and plenty of brake fluid it should pop out or do i hit the outside of the cylinder? Link to comment Share on other sites More sharing options...
junkuser Posted September 28, 2007 Share Posted September 28, 2007 Hit the end of the cylinder in an axial direction. Same effect as Charlie suggested.Gently heating the cylinder sometimes required taking advantage of the different coeficients of expansion of the steel piston and alloy cylinder. Link to comment Share on other sites More sharing options...
gt6878e Posted September 30, 2007 Share Posted September 30, 2007 i found it a help if you run the outer casing under hot water for a few minutes, it expands it enough to just be able to flick it out.....worked on minedarren Link to comment Share on other sites More sharing options...
Hoolz Posted October 2, 2007 Author Share Posted October 2, 2007 great tips again lads, cheers. i sat the casing in a shallow bowl of really hot water for a minute then tapped it once with a wooden spoon and my piston just fell out.i'm now replacing the seals but i've come across a problem. looking at the hayes diagram, the piston (7) should have a groove near the front for the piston seal (13) to fit onto, however my piston doesn't have any groove so there's nowhere for the seal to go. *confused.com*any thoughts? Link to comment Share on other sites More sharing options...
heraldcoupe Posted October 2, 2007 Share Posted October 2, 2007 Hoolz wrote:looking at the hayes diagram, the piston (7) should have a groove near the front for the piston seal (13) to fit onto, however my piston doesn't have any groove so there's nowhere for the seal to go.The front seal was deleted in the early 1960s. It was seen as unnecessary, it was there to prevent fluid leaking if the main internal seal failed.Cheers,Bill. Link to comment Share on other sites More sharing options...
Hoolz Posted October 2, 2007 Author Share Posted October 2, 2007 aaah haa!!! i think i've sussed out what the problem is. it looks as though the piston is from a master brake cylinder dammit! the brake cylinder exploded diagram shows a piston without any groove. how the hell did that get in there? can i buy just the clutch piston? Link to comment Share on other sites More sharing options...
Hoolz Posted October 2, 2007 Author Share Posted October 2, 2007 completely ignore that last statement lol. Link to comment Share on other sites More sharing options...
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