Hi Guys,

there been a strange noise coming from what I think is the timing belt idler (the small pulley at the top between the banks. I took the front cover of today to have a look the noise seemed to be in time with some white markings on the belt and went away when I sprayed a little wd on. However after i stopped the engine I noticed that the belt was slack on this pulley and it was able to move freely, despite the belt being seemingly tight on the cam pulleys. Worried I sent a text asking my local mechanic to come have a look this week. As I finished my text and turned around I heard a click I had heard before and saw the rear cam pulley on the front bank rotate a few degrees. The belt was now tight on the idler pulley. Is this normal or have I got issues with my tensioner or something else? From looking at the receipts the timing belt etc were done only a couple of years ago.

Thanks in advance for any help.
Steve