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Clutch
Clutch - Drive Strap Alignment
Created: May 29, 2003
If the pressure plate clutch plate friction face needs re-surfacing, get it machined to clean it up. Make sure the engineering company doing the job records the amount taken off, as the recorded amount needs removing from the tops of the 'horns' that stick up to ensure proper clamping force is achieved.
FULLY-FLOATING PRIMARY GEAR BUSH
Created: August 28, 2002
Countless Mini enthusiasts have been dogged by primary gear bush hassles on 1275-based engines - in particular the one nearest the block (the front one). Worn ones are expensive and difficult to replace for the DIY-er because they need machining to the correct size, a job that needs to be done very accurately - a particular problem for over-seas enthusiasts. Racers from all disciplines are all too familiar with the bush spinning in the gear - usually jamming the gear so no drive gears can be selected and sometimes rendering the gear useless; replacement of which is very costly.
DIAPHRAGM SPRING - Pre-Verto types
Created: December 04, 2000
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.
DIAPHRAGM SPRING - Verto types including injection
Created: December 04, 2000
The Verto/Valeo type diaphragm included the pressure plate in its assembly, much like a 'normal' car set-up. The spring being of the 'finger' type as opposed to the disc spring used on earlier, three-piece assemblies. There were originally three diaphragm specifications using progressively stronger springs - small-bore, big-bore, and Metro Turbo.
CLUTCH PLATES - Verto types, including injection
Created: December 01, 2000
There is only one original Verto/Valeo clutch plate and is fashioned more like a ‘conventional’ clutch plate - it has a sprung centre section. Four springs around the centre section of the plate take up shock, and supposedly reduce the likelihood of judder. It was an attempt by Rover to improve the clutch take-up and engagement to make is more like a 'modern' car.
PRESSURE PLATE- Pre-Verto & Verto types
Created: November 30, 2000
Apart from very first one that should be avoided at all costs (cast in part no.2A3509), there is an astonishing five other types generally available. For high-tech ones see 'Flywheels & Pressure plates - technical advances'.
CLUTCH PLATES - Pre-Verto types
Created: November 30, 2000
There are generally three types to be concerned with these days - standard pre Verto, fiber rally/race, and sintered race. All at 180mm diameter. Standard-type plates. The pre Verto plate has a spring-steel centre section to which is riveted the lining. Between the linings are sprung washers.