I'm just in the process of finishing off my Cylinder head rebuild, i'm about 95% done with i tiny little problem. On the 1.6 16v, the tensioner pointer for a new belt should line up with the notch. All good and well but when i turned the engine over manually to settle the belt the pointer moves fully to the right and moves left and right to and from the notch??

I've read the Haynes manual and followed it exactly, the tensioner is new. The bolt is done up nice and tight (15 lbf ft) when ive lined it all up but as the belt rotates around it it knocks the pointer off...help!

Annoying cos i managed to do the whole engine start to finish without any problems apart from this bl**dy tensioner