Daihatsu Sirion

I assume you are changing the timing belt. I am a mechanic and although not familiar with your vehicle, you would usually locate the timing mark on the bottom pulley and line this up. Careful not to turn the engine over too hard as pistons can strike valves. then you should look for similar marks on the camshaft pulley[s], and line these up. Then fit belt. This has to be tensiond correctly which is important. Hope this helps. Mike the bike01.