OK, mystery solved and the marine ornithological population can breathe easy again.

 

I did some extended on-site investigation (sat in the car and went through a number of cycles of start, no revs, turn off, wait about 5 minutes, do it again) and noted the squeal was only on 'cold' start and not on a warm start.  Revs made no difference.  Managed to locate the noise to the top area of the nearside dash and a bit more poking around identified a fan in the window side air blower as the culprit.

 

So, nowt to do with the turbo (thankfully) - although in my defence m'lud the noise was from about the same direction.

 

So, many thanks for the prompt responses; goes to prove just how darned good this forum is.

 

Please note no seabirds were harmed in this exercise.

 

Original post:

Either I have a Skua hiding under my bonnet or there's a bearing-type squeal briefly on start up.  Once the revs come up the squeal stops.  I was wondering if it's a turbo bearing not getting oil on start up but that's a guess.  I've checked the sump oil - OK - and no unexpected leaks around the motor.

 

Car is a 2007 Octy 2 2.0tdi with a BMM motor.

 

I've tried forum searches but nothing stands out.

 

Anyone have any more info in this, please?

 

Edited 19 September, 20232 yr by MikeTheThinker

Does it happen consistently?

Auxiliary drive belt slipping?.

2 hours ago, MicMac said:

Does it happen consistently?

 

1 hour ago, Radiogaga said:

Auxiliary drive belt slipping?.

Solved, thanks. I've updated my original post with the details.

 

Are you a Beatle?

I was going to suggest throwing a cup of water on the auxiliary belt to see if it helped, they can become fouled/hard/glazed/loose causing such noises.

 

Quite often a good dousing of hot water+detergent followed by a thorough rinse can fix such occurences.

Edited 19 September, 20232 yr by MicMac

4 minutes ago, J.R. said:

Are you a Beatle?

'Fraid not.  I used to play out with youngsters from the extended McCartney family when they stayed with Paul's dad just down the road from where I grew up.  We'd meet the kids en route to school but at the tender age of about 8 or 9 didn't pay too much attention to their backgrounds.