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Originally Posted by JFP in PA
Not to be unkind to Wayne's site, but I think more than one person has gone astray after reading it by not locking everything down properly before releasing the tensioners. Once released, there is a lot of valve spring derived load on the chains, particularly on a three chain motor, and bad things happen quickly.
A loose tensioner on start up causes the timing chains to "whip" back and forth a bit, which is not a good thing over time as it can weaken chain links, VarioCam components, and even the actual gear on the IMS shaft itself. Sometimes the noise is a combination of the tensioners and wear on the chain tensioner pads (they have a plastic wear surface) on the main pads, or even the smaller pads between the cam linking chains on the five chain motors. When that happens, just replacing the tensioner will not totally quiet the motor unless the pads are changed also, which is a pretty major undertaking as the motor needs to come out.
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Just curious JFP, how much labor is typically involved in removing the engine and replacing the chain tensioner paddles (99610525300). Also, how much additional labor would be required, should the chain guides/ramps (99610517552 and 99610517353) need replacing, as well? I actually just had my paddles replaced, while my 986 was in getting an IMS retrofit kit, clutch, and RMS installed. I am curious to see how much labor other mechanics tend to charge for this work. BTW, here is a photo of the old chain tensioner paddles, as you can see the inner set on both banks was pretty ate up.