At what mileage do you change a cam belt on a ford fiesta 1.3 LX

The serpentine belt has no bearing on the camshaft timing, so my guess is that you mistimed the camshaft timing for no reason.

The serpentine belt is external and is driven by the crankshaft and runs the alternator, the A/C, Steering Pump and water pump.

If your CAMSHAFT belt broke, the Ford Fiesta has an interference engine, so you have bent valves and damaged pistons.

Does A Ford Fiesta Have A Timing Belt Or Timing Chain?

https://www.autopadre.com > belt-or-chain > ford-fiesta

Ford Fiesta - Timing Belt Or Chain - All 2011 Ford Fiesta engines have a timing belt and are interference. Engine Type, Timing Belt Or Chain ..

Set the crank to 0 degrees according to the timing marks on the damper, look on the cam pulley for a mark and line it up with the mark on the head. Put the belt on WITHOUT moving the cam or the crank.

FORD FIESTA ZETEC 1 4 TIMING BELT REPLACMENT part 1 FORD FIESTA 1 4 DURATEC TIMING BELT REPLACMENT pt2

FORD FIESTA ZETEC 1 4 TIMING BELT REPLACMENT part 1

if it has a belt (not a chain) it will need replacing when the car is 10 years old or when the engine has done 100 000 miles or which ever comes first

please let me know if this helps
cheers
big mike :)

AT 100,000 KM

timing belts should be replace at 60,000 miles. ithe focus is a belt

you have to open the boot and go in through that way. you know where the lights are? lift the carpet bit back and you should be able to do it that way. havent tried it myself but going to try and change mine tonite