Andysoch I have run across rattly chains many times, and every time its been the chain rubbing on something, probably a guide has broken, which is usually the case.
Shuz Loves Suzi, I don't know what kind of experience you have, I have over 25 yrs, a degree and a few ASEs, I never made a master tech due to my back.
A timing belt tensioner is sometimes self adjusting in that it pulls tension on the belt for the "initial" tension, then you tighten the adjuster down, it does not move after that, it does not self adjust unless you loosen it again and allow the spring pressure to reapply pressure to the belt.
But in my experience about half of those spring type actually worked correctly.
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