Replace Troopy Waterpump

According to the workshop manual, "Remove the timing belt, idler pulley and cam shaft sprocket" goes on to say "Remover the retaining bolts and remove the cam shaft oil seal retainer plate from the front of the engine"
The people that design engines certainly never have any intention of working on them!
I hope this helps. Tony

Ozzie
It is fairly normal to have to remove a timing sprocket. Everyday situation for a mechanic! The cam may move slightly because of vale spring/cam lobe pressure equalizing, but it isn't going to be going around much at all, it is a six cylinder so minimal movement. The cam wheel/sprocket is pinned to the cam so can be easily attached afterwards and cam and wheel returned to original position, along with the engaging in the same teeth of the belt. You will mark them with a white marker pen if unsure, I presume. Take off the pump and the reassemble.

If you ensure TDC before beginning, the crank isn't going to move and the cam and wheel position will be marked and able to be aligned with it's timing indicator too. Belt simply drives it around and has no actual timing of itself. Adjust tensioner.

You should renew both the timing belt and belt tensioner while you are replacing the water pump.

When I did my Prados timing belt I did the lot, replaced water pump, timing belt, tensioner also replaced the belt driving the alernator, aircon power steering pump etc and tensioner and idler bearings.

Figured cheaper to replace the lot in one hit rather than have to do it again if the water pump failed down the track.