Any addendums to this DIY guide? I read on another message board there is a tip to unfasten the engine mount on passenger side, to jack up the engine at an angle to make it easier to access the timing belt area. Another tip on a video was to put paint marks on the old belt that go onto the cog wheel...

I'm thinking of trying this procedure to replace water pump, timing belt, pulleys/tensioner, and serpentine belt on a 2006 XC90 2.5T. My question is, to better understand why the camshafts and crankshaft need to be rotated into the singular positions indicated by the timing marks. I'm guessing it ha...