Regular inspection and maintenance is essential to maintain optimum performance.

Excessive heat generation (often witnessed by discoloration of the steel pressure plates ) due to prolonged or repeated slip can result in loss of diaphragm spring load as well as driven plate damage. In such cases the clutch should be replaced or reconditioned.

Pressure plates should be checked for coning using a straight edge and feeler gauge. 'Out of flat' pressure plates or driven plates can result in difficulties releasing the clutch and consequently drag. Pressure plates should be replaced when more than 0.10mm (0.004") out of flat, however, the amount of out of flat permissible is typically less the greater the number of plates in the clutch assembly.

Replacement Parts are listed with each Sintered and Cerametallic clutch assembly.

Driven Plate Thickness and Wear In.

Driven plates should be replaced if there are signs of damage and as a guide when the thickness has been reduced to the figures given in the following table.

The total allowable driven plate wear will vary according to the "wear in" and the number of driven plates for each particular clutch. For example, for a 3 plate clutch with 0.75mm "wear in" each plate can wear 0.75mm/3 = 0.25mm from new.
The minimum worn driven plate thickness given in this catalogue assumes even wear across all plates. However it is permissible to to run plates below this thickness provided the total wear does not exceed the "wear in" figure.