Date: Tue, 14 Oct 2003 07:11:06 GMT
From: Paul Halliday <>
Subject: Re: Clutch Quick Question

in article, Grunff at wrote on 13/10/03 11:39 pm: > Paul Halliday wrote: > >> Your replies are always appreciated and valued. You've not been wrong yet >> with my questions - I'll vote for you as Minister of Saab Information, if >> the job ever comes up :) > > Lol! Spending way too much time tied to the pc at the mo - big > project, much coding to do. <homer> Can't talk ... Coding </homer> >> It's only a little noise at the moment. I keep having more jobs done to the >> front end (this time it was a wheel bearing) and I keep hearing more and >> more noises the quieter the car gets :) >> >> I think my last 900 (the '85 900i) suffered this problem to the extreme. It >> did sound like a jet and the noise could be heard above the engine noise >> when driving. What's going on in there (the "potted" version)? What >> ultimately fails disastrously if it is left? > > The release bearing is a steel ring with a U cross section, with > ball bearings in the U section. When you push your clutch pedal, > it pushes the clutch master cylinder piston, which pushes > hydraulic fluid, which pushes the clutch slave cylinder piston, > which has the release bearing attached to it, which in turn > pushes the clutch diaphragm spring. Phew. > > As the bearing gets old/contaminated with dirt/grit/whatever, it > gets noisy. When it fails, it may just seize up, in which case > you'll still be able to operate the clutch until the slave > cylinder gives way because it's piston is being spun round and > round. Alternatively, it could just break apart, at which point > you won't be able to operate the clutch. > > Make sense? That does. Thanks. I'll make sure I have all this stuff pointed out when the car gets a job in that vicinity done. My garage often show me what they've pulled off the car and explain how it failed - it makes a lot of sense when you see the parts. Cheers, Paul

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