Hi guys , need some help in pinpointing the problem with my 2007 mk2 1.8 focus , there’s a quite loud grinding/bearing noise upon start up and occasionally while driving, I’d like to say tensioner but the noise stops after about 10/15 seconds,

Any help would be great 👍 

A mechanic’s stethoscope would help pinpoint where the noise is coming from. They’re quite cheap as well. 

I used a long screwdriver just now to try and locate sound and I’m thinking it’s possibly the belt tensioner bearing? Would you agree?

11 minutes ago, Adam1988 said:

I used a long screwdriver just now to try and locate sound and I’m thinking it’s possibly the belt tensioner bearing? Would you agree?

Yeah sure why not. It’s impossible to say really from a video, but if your screwdriver test gives you confidence then replace that bearing and you’ll soon know if you were right!

How old is Your water pump?

I’m going to say it’s the original water pump I think, so could be water pump bearing? 

That’s what I’m thinking.

you need to take belt off and spin everything to check. on my wife's mk1 focus there was a noise but I could not tell exactly where it was coming from. Until on M1 a hundred miles from home the alternator belt came off. Closer investigation showed the tensioner bearing siezed and the plastic wheel melted from the friction of the belt.  had this been a car with the water pump driven off timing belt I may have been able to get home before battery went flat (although steering was a bit heavy) but I could not drive on as car was overheating due to water pump not turning as water pump driven by the alternator belt. Luckily I had RAC membership who brought the car home for me. But lesson learned, if there's noise I should make sure I identify what the problem is instead of shrugging my shoulders and scratching my head and leaving it for weeks. 

Ok thanks for that , I will loosen belt off on the tensioner and spin ancillary to see if I can better locate , am i right in saying that if I can turn water pump by hand off the belt then pump bearings are shot ? Thanks again