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Clutch 15 - SAC

For cars used in everyday traffic, higher torque actually makes more sense than higher performance does, because to produce higher performance, the engine has to rev relatively high. The immediate disadvantage of an engine with high torque, is the higher mechanical/hydraulic operating force. Many improvements in this area can do only little to change the basic problem.

It would seem that precisely here, does the Self Adjusting Clutch offer additional alleviation, indeed, it still has other advantages as well. Up to now, the adjustment occurred through the operation, in this case it intervenes directly between the spring and the pressure-ring. Simply said, the pressure-ring becomes thicker by the same amount that the thickness of the clutch-plate, through wear and tear, becomes thinner.

This is achieved by detaching the normal membrane-spring from the clutch housing and, at least in the first SAC-series, installing a second spring with an additional ramp-ring. Should the wear and tear of the clutch- disc continue, causing the spring-travel to go further, then a ring which is slanted around the circumference, twists in such a way that the original spring travel is reinstated. The adjustment of the clutch operation is actually, no longer needed.

What is still much more important is, the membrane spring is always strained at the same travel, thus, only there must it have it's maximum tension. If it had to cover a larger travel, the maximum would be greater and thus, also the operating force. The whole clutch and with it the clutch-disc, is spared and has an accordingly longer lifespan.

Indeed, one must mount the clutch with a thinner, twisted ramp-ring, this should already be fixed into place during dismantling, which is best done by using the special tool shown above. 03/13

Clutch repair dual-mass flywheel

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