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As the chain wears, the tensioner takes up the slack and KEEPS the chain tight even during cold starts before the oil pressure builds up.
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Larry:
The spring inside the tensioner keeps tension on the chain during startup.
If the spring fails the ratchet mechanism is there in hopes that the chain will still remain tight enough before oil pressure builds up.
In the event of loss of oil pressure, you have both the ratchet and the spring to help maintain chain tension before the owner has a chance to shut down the engine.
Gilly