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You should be able to feel a loose or non-working tensioner by moving the cam sprocket back and forth. Of the tensioner has taken up all the chain slack(its job), the sprocket will not want to move freely, even with all valves closed avoiding spring compression effort. It should be locked to the crankshaft sprocket and allow no motion(w/o moving crank).
Removing the tensioner, and then checking cam sprocket motion would give an indication of the tensioner effectiveness.
When removing, there should be spring pressure pushing the whole thing out of its mounting spot on the engine. If there's no spring pressure, it may be the tensioner never 'released' when it was bolted into its position.
tom
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