Ok so one of my motors is a 1994 Fiesta I love these cars, so easy to work on... in conjunction with another one of my motors, a transit, being slowly relearning all those things I'd forgotten from being a kid working on cars with my dad...the Haynes says nothing about changing the timing chain...or I can't find it?

Anyway massive muffled rattle coming from engine...not tappets...Any advice on changing the timing chain...what to look out for... could it be ought else? any advice would be greatly appreciated.

Thanks