Great thanks for the belt no. The noise on start when cold is like a dry bearing with no squeal, but also has a clack clack noise superimposed. The clack clack almost disappears after a while but leaves the dry grating noise which also almost disappears after a run. Getting head quite close it does sound like the tensioner pulley. However it is definitely from the front of the engine. Other culprits may be the cam belt tensioner. (Cam belt changed 2 years ago) or the auxiliary idler wheel.
If I can get at least a new belt & pulley, I will have a go at running the engine without the belt for a short while from cold. Oh I am fairly sure it is not the variable cam actuators.

Last edited by IcePack; 28/01/23 08:18 PM.

4/4 Ivory 4.1:1 axle, Mercedes A200 AMG