I was recently lucky enough to win a C5 from the UK TV channel Dave. When I first received it, I checked it over (pumped up the tyres/tightened the brakes/fresh battery) and everything seemed fine for the first few runs.
However, now there is a grinding/rattling noise coming from (I suspect) the chain tensioner. At slow speed, everything seems fine but at speed/under load when the chain tensioner moves is when the problem occurs.
Being a brand new owner with little to no mechanical experience, can anyone offer advice for possible causes/solutions?
Best contact for advice is my Twitter ID - @David_Flett

Hi there are you sure it's the tensioner
It could be the belt slipping

No, it's definitely the chain tensioner. I turned it on its side so that I could turn the pedals & watch the mechanism...the tensioner is flexing up and down when making the noise.
Initially it didn't do that, so I was wondering how I remedy/rectify the situation.

maybe put some wd40 at it :)

Hi you may find that the chain has stretched so the tensioner is not able to take up the slack or there may be something missing of it
Photos would help ...
Chas

For the moment, the problem seems to have stopped. I'm sure I would have thought to use the name brand penetrating fluid myself (thanks Dirk-Jan for the suggestion) but I'm just glad it wasn't something more complex. If it's an intermittent problem, I may be back for more advice. 😁