Hi matey ive done timing belts on 12.5 1.6 and 17 zetec engines. The 1.25 and 1.7 crank/auxiliary pulley came off but the 1.6 one didnt. I had to smash the bottom cam cover off cause it has 2 sections to it.

It has took me about 3 hours to do them all over the years. You need to use a crank locking pin cause once the aux pulley bolt is off the crank pulley is free floating.

We have still go our focus 1.6 which i had to smash the cover off ad its got 133k on it now. I just made sure i got all the bits of the timing cover out from where the timing belt is.