It's been making noises for ages now and garage didn't know what pulley wheel it was coming from, well now I know
Belt looks ok, but do you recommend it gets replaced just in case.
P.S. Haynes manual don't explain how to remove the tensioner only the belt.
Ok, it's all sort now phoned Ford Service to see if any special tools were needed for my model and year and there's not so for anybody needing to know here goes.
Note: The following is for a UK Spec Ford Galaxy 2.3i Zetec with AC. Other models may differ.
15mm Spanner/Socket (for tensioner release)
19mm Spanner/Socket (for tensioner removal)
Ford Galaxy 2.3i Zetec With AC.
Remove the underside tray if your Galaxy has one.
Using the 15mm spanner/socket on the tensioner bolt (the one that holds the pully, facing the offside for UK spec). Turn this clockwise up into the engine bay to release the tension on the belt.
Slip the belt over the tensioner and release the tension.
Now look behind the tensioner itself and you should see a 19mm bolt, undo this and the tensioner will come away from the engine.
This is the reverse of removal, the tensioner has 2 lugs small and large, align these with the holes from where you removed the old one and tighten the 19mm bolt making sure not to cross thread (finger tightening is good first of all).
Once tightened you can retension the belt using the 15mm spanner/sprocket, this is the same as releasing the tension by turning the tensioner clockwise.
This can be done without without jacking up the vehicle and takes approx. 15-20 mins to complete.