DIY Perodua Viva 1.0 AT Timing Belt Replacement

DIY Perodua Viva 1.0 AT Timing Mark

For the first time I've to check and change where is this compact car with single cam 3 cylinder engine timing mark i was no idea and how.
There is no such engine in the world without any of the timing mark not marking in the cam or cam pulley or any of the plate where you can see it.
Before i did trying to Google it anywhere but couldn't found what is related
So back to mechanical knowledge I've got you have to bring the piston number one to the TDC ,explanation the number one piston is the nearest to the cam or the timing belt.get your spark plug socket and remove the number one plug,for easy get some long about one foot long screw driver to the plug hole and do a revolution until it stop moving down there you know it was a piston number one at TDC.
I know there is a dot to dot mark's on the bottom pulley but...

There is no mark's on the cam pulley side of any of the cam cover or the inner side valve cover for this type of car.

The next thing is i simply get a paint marker and mark it on the cam pulley and line up with the dot.
Please make sure your bottom Crank shaft pulley are already mark's line up dot to dot and your cam pulley dot are mark line up with the dot where you can see it from the pic below.
Actually there is one tooth away you should aware from the cam pulley side dot.if your are not sure i always count the belt tooth from counter clockwise to the cam pulley dot to make sure there is no mistake when you put the new belt in.Remove the tensioner bearing,check both cam oil seal,usually if there is no leak and still looking in good shape im not gonna change it,but if leaks found this is the good time to get replace.
Put the new belt on,tighten back new tensioner bearing,and make at least two counter clockwise revolution to make sure the mark's is still line up.reinstall the rest of the parts. Start your engine and you are good to go.
Good luck.