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This small bolt it almost always removed when doing a clutch job and when retorqued it can often feel soft. They do stretch and a broken bolt will cause disaster- replace it and be sure!
DIAPHRAGM SPRING - Pre-Verto types
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I'm ignoring the old original spring-type jobs here for the same reasons I wouldn't suggest using their flywheels! These are the shallow cone-shaped objects that the release bearing pushes on, with a steel band (disc spring) on the underside that presses against the flywheel. This provides the clamping force on the clutch plate that ultimately passes the torque/horsepower to the wheels (via the gearbox of course!). This component is therefore available with various different spring rates/tensions dependent on the application. I'm not going to bother with actual figures here as it will be meaningless to the vast majority and because they are always referred to by that which they are most recognised - colour. Or to be more precise - the colour that is used to identify the different grades. The whole diaphragm is not painted this colour, only the spring is colour coded by a daub of paint. This is because the actual main body of the diaphragm is the same throughout - apart from the two highest grades where stiffener plates are welded to the release bearing plate retainers. There are four colours generally now used -