Date: Mon, 13 Oct 2003 23:39:51 +0100
From: Grunff <>
Subject: Re: Clutch Quick Question

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. > 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? -- Grunff

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