Take the cambelt cover off and check if one of the bolt of the pulley has beocme loose, This happend to a figaro turbo engine, i gave in for recon and when i got it back, i fired it up and it was maing a similar noise to this, and upon inspection, one of the bolt was loose from the pulley.
I was lucky it didnt get in the way of the cambelt and wrecking a newly recond engine
