Help Cam belt advice Vauxhall Astra 1.4 16V 1999 model

[tonygw]

HI guys

I am helping a friend replace a snapped timing belt on a 1999 Astra 1.4 16V.

I need some help in fitting the new belt.


We do not know how to set the timing marks in relation to the crank. As its 16V there is a mark on each of the cam pulleys and a mark on the crank.

Where should the marks be pointing to get TDC on No1 so that the belt can be re-fitted?

Any help appreciated.

Cheers
Tony