It's because he doesn't understand the use of this tensioner.
It disengages the water pump to help the engine warm up faster.
In the Peugeot, it's very easy to access. Not their fault that Minis have a micro engine bay.
I am aware the timing chain tensioners commonly play up with these Prince engines. If you catch the knocking sound early enough (it only occurs on cold start for a few seconds), can you avoid a timing chain + guide change by simply changing the tensioner? I am going to engage an independent specialist mechanic to do this for me. If it needed the whole lot.. well I would have to push Peugeot to contribute as that is unacceptable for a car of this age with full service history, especially as it is a known issue.
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