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It is there to make up for when the engine is Hot or cold, The system needs to have some way of expanding without making the belt tighter and snapping the cams/teniosners off.
When the engine gets hot it expands like anything else, the tensioner allows this and gives the slack it needs when it does expand.
This is why studs snap when people don't set the tensioner correctly, engine warms up, tensioner bottoms out, stud snaps.
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