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Originally Posted by san rensho
As an aside, the Pelican DIY for replacing the IMSB doesn't require the cam lock, it just uses set screws to lock the IMS before the tensioners are released, so I thought maybe I could get away with just removing one without the cam lock.
Other than the annoyance, is there any long term damage being done by the start up clatter?
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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.