For what it's worth, on the z20let I tensioned mine rotating the water pump and the little metal marker ended up at about 11 o'clock and then tightened it up from the tensioner afterwards. Can't say if it's meant to move when the engine is off though sorry, but what I know is the water pump metal knob thing that sits on the outer side is meant to be at around the 11 o'clock since the tensioner can only do so much
Sent from my SM-G930F using Tapatalk