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The Mini clutch slave cylinder is a vital link in the proper operation of the Mini clutch. The master cylinder feeds the slave cylinder to exert the mechanical pressure to disengage the clutch. The simple sounding process is complicated by a worn cylinder. As the wear continues it first will probably bypass, meaning that the clutch will not stay disengaged when holding the pedal down. The next more obvious sign is when you actually see fluid leaking! The slave cylinders are easy to replace. The cylinder bore size is 7/8" diameter.
It's easy to know if you have a Verto or the original type. The Verto slave has a tab in the casting for a return spring, and uses a "Banjo" style hose to the cylinder body. This original style unit mounts at the top of the flywheel housing, and acts on the longer (6-8 inches) throw out arm.
Mini Flywheel and Clutch Identification
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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 use on any engine assuming to keep it the 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 slave cylinder mounting. The pre-Verto clutch slave is mounted horizontally directly onto the flywheel housing about level with the top of the long clutch arm. With the Verto, the clutch slave cylinder is mounted on a bracket which is mounted on the flywheel housing allowing the clutch slave to point downwards at an angle to meet up with the clutch arm rod coming off the end of the very short clutch arm. The slave cylinders are visibly different, too.