Check the key seat: it must not be damaged or worn by contact with the key.
Caution! To prevent accidental loosening that would cause serious damage to the engine, always use new self-locking ring nuts (A) for fixing all the timing pulleys.
![](https://motoinstruction.ru/img/ducati/8/115152.jpg)
Check that the tensioner bearings rotate freely without excessive play. The mobile tensioner bearings can be changed after removing the outer circlip (B).
![](https://motoinstruction.ru/img/ducati/8/115153.jpg)
When refitting the new bearings on the pin, use retaining compound. The belts must be in perfect condition; they should be changed every time the engine is overhauled.
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