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I replaced mine (upgraded to the hydraulic ones) recently (83-911SC 93kmi) and am amazed at the change in the sound of the engine. I must have gotten used to the rattle of the chains over the years without knowing it. It now sounds very smooth. An old mechanic at San Mateo Motors suggested that it was time for the upgrade by simply listening. At the time, I could not hear a thing. If you can hear yours, I think it is time for change.
BTW, my old tensioners seemed very stiff. I'm not sure how to test them, but I can not see anything wrong with them. In fact, when I took them out I figured I had wasted my money. All thoughts of this were forgotten the moment I fired it up.
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Graham Archer
83 911SC Cab
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