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DIY Classic Mini Clutch Articles

Austin Mini Flywheel and Clutch Identification (Technical Information)
 The pressure plate on the left is called a 'spring' type, as typically found on early 850cc engines. The one on the right is called a 'diaphragm' type.  While the pressure plates are NOT interchangeable on the flywheel itself, either flywheel can be used on any engine assuming you keep the flywheel with the correct pressure plate. The back plates and the clutch disc itself are interchangeable. Pre-Verto versus Verto Clutch In 1980, the Mini’s clutch underwent a major change. The internal clutch/ flywheel assembly changed as well as almost all of the external, connecting bits as far back as the master cylinder. They are pretty easy to tell apart with just a quick look inside the engine compartment. Here are two ways. There are others. Clutch arm. The clutch arm for the...
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Borg&Beck Brand Name (General Articles)
What’s in a name: Borg & Beck   “Over the past few years some companies are claiming to be selling Borg & Beck clutch kits and pieces. These are not boxed Borg & Beck. If the parts you are ordering are not in a Borg & Beck box they are not Borg & Beck, no matter what! If you truly want Borg & Beck, the leader in the British clutch market, make sure it is ...
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Classic Mini Clutch Design and Technical description (Technical Information)
Clutch FAQ (Non-Verto) by Marcel Chichak One of the more common questions asked by Mini owners is "why doesn't my clutch disengage properly?" or "why is it hard to engage gears?" The usual symptom is that the clutch engages right at the floor and you find yourself embedding the pedal in the carpet to avoid grinding gears. Given that the clutch worked properly when the car left the factory the obv...
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Clutch - Drive Strap Alignment (Calver's Corner)
  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. If this is not done, clutch slip is inevitable. If using a pressure plate of unknown hi...
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Clutch Checking (Pre Verto) (Technical Information)
Maybe your Mini clutch is working fine. Maybe you’re starting to notice that the master cylinder fluid is going down slowly. Maybe the action just doesn’t seem the same. Maybe you are hearing some noises you don’t remember hearing before. The following are some quick checks even a beginner can do to make sure a clutch keeps operating correctly or to point one towards areas that m...
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CLUTCH PLATES - Pre-Verto types (Calver's Corner)
There are generally three clutch plate 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. These take up some of the shock impact of engagement and slight surface imperfections of the f...
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CLUTCH PLATES - Verto types, including injection (Calver's Corner)
There is only one original Verto/Valeo clutch plate and it 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 it more like a 'modern' car - except it didn't....
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Clutch Works (Technical Information)
If I were keeping score, I would have to say that the most common questions on our tech line involve clutch problems. Many of these are from reputable repair shops! The usual complaint is that the clutch pedal is right on the floor, and the common belief is that the problem can be remedied by replacing the clutch disc. This is not the case! The problem is more often one (or both) of two things: Im...
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DIAPHRAGM SPRING - Pre-Verto types (Calver's Corner)
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 ge...
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DIAPHRAGM SPRING - Verto types including injection (Calver's Corner)
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, later joined by the type used on the injection cars...
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Finally - a solution to primary gear front bush problems for the large-bore engine.   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 bushes are expensive and difficult to replace for the DIY-er because they must be machined to the correct size, a job that needs to be done very acc...
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Mini Cooper Verto Clutch Information (Technical Information)
This is presented for historical information only- ALL 1275cc 1990 onwards, with the 190mm clutch plate, now use the GCK152AF Verto Clutches - Alternatives and differences.This article has been written owing to the increasing amount of people who ring Mini Spares stating that their 1275cc Injection type Mini will not start after fitting a new clutch, especially when they have purchased ...
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PRESSURE PLATE- Pre-Verto & Verto types (Calver's Corner)
Apart from the very first one that should be avoided at all costs (cast in part no. 2A3509,) there are an astonishing five other types generally available. For high-tech ones see 'Flywheels & Pressure plates - technical advances'.   22A598  Number cast in. Standard-grade cast iron 22G270  Number cast in. High-grade cast SG iron as fitted to Coopers and Cooper Ss...
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Primary gear question and answers. (Technical Information)
SUBJECT: MiniMania.com: primary gear clearance NOTE: Chuck or Don, I hope you can give me some direction. The clearance on my primary gear is .021 inches do i need to replace the front and rear primary gear bushings? thanks for your help.    Robert,    .021" is about 3 times the maximum allowed. There are only four pieces that could be the problem. Primary gear thrust washe...
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Time for a Clutch (Restoration)
Time for a Clutch December 5, 2012 There is still nothing under the hood, and there won't be until the drivetrain is sorted Jere Dotten finds that we have all of the original clutch components With our engine coming together, it was time to find a clutch. Our car came with a new, stock, clutch and pressure plate. Though they were 30 years old, we decided this OE Br...
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Mini Cooper Specials