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How much should the timing belt tensioner move when it's doing its job properly?

Mine is moving slowly and smoothly up and down when revving the motor in neutral. It doesn't bounce, it's a very smooth movement that follows the revs.

So, how much is too much movement?
 

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How much should the timing belt tensioner move when it's doing its job properly?

Mine is moving slowly and smoothly up and down when revving the motor in neutral. It doesn't bounce, it's a very smooth movement that follows the revs.

So, how much is too much movement?
How old is it (miles)? Is it OEM? I'm not an expert on whether they move a lot. I would think not much.
 
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