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Interresting, but I have read that:
These tensioners are one of the most mis-understood items on these complicated 911s. Firstly, they are not oil-pressurized tensioners, they are oil-dampened, which makes a huge difference. That means they are spring-loaded and then oil filled to dampen them (like a shock absorber) during operation. I believe that the oil dampening reduces the spring-back effect of the natural spring inside and helps to keep tension on the chain and prevent "bouncing" of the chain tensioner against the wheel.
so the pressure applied during the timing setting should be enough..
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