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step 27 shows the pilot bearing shaft. It is normally part of the flywheel and keeps the input shaft of the gearbox from floating around at high engine RPM.
Majority of the time an engine will have a spigot bush or bearing and the pilot shaft will be part of the gearbox input shaft, however bmw have done it differently here and the input shaft actually has a hollow area for the pilot shaft to locate. (shown in the picture above)
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