physically fitting it in there are going to be big hurdles. if its out of a mk1.5 focus its still the old escort diesel engine fitted with common rail injection system so going to be the easier conversion compared with the mondeo units.

wiring it all up and making it all work is going to be the biggest headache and personally way too much work for what you will end up with.

i'd far rather start with an escort tdi lump. increasing the boost a little and fuel pressure will see 110bhp pretty easily and wit even more boost and fuel pressure (standard turbo) and front mount intercooler should be looking nearer 130bhp. perhaps then its time for bigger injectors and turbo to see nearer the 145bhp mark and far far far cheaper than fitting a modern tdci that imho is going to be far worse!

apart from the poorer reliability of modern diesels (and the huge expense when they go wrong!!!!) they dont have the pull from low down that a traditional diesel does. traditional diesels will slug on even when they're about to die but modern stuff just dies, little hint of labouring it and engine dies along with power steering and servo assist brakes!

go te escort tdi route, far far far better!!!

btw i've driven and lived with for many years both traditional and modern diesel cars and great though they are wen they work modern diesels are not that good!