is it normal for the tensioner pulley to move slightly whilst idling?

[pillzor]

noticed this morning when i was looking for something else that my tensioner pulley moves up and down probably about 3mm whilst the engine is idling , is this normal?

[bandidoben]

yeh mate thats fine no need to worry unless you can here it slipping constantly.

[Not_An_Abba_Fan]

If it clicks noticeably then it would need repalcing, but other than that it is normal.

[pillzor]

no clicking , thanks for the help.