Parts for the 4.2 apart from Ford are near impossible to source in my experience though i have been able to get an alternator (US ford school bus G3 90amp ebay), belt tensioner & idler (Dayco) Filters(Mann). There is a MWM rep in Sydney but he specializes in marine donks & won't touch the Sprints.
Woe betide us if we ever need rings bearings pistons etc.
Does anyone know a friendly reliable Brazillian??
On the parts front, the Ford Dealership should be able to help, they have a policy of supporting vehicles with parts up to 10 years after selling them - however, naturally it will have a price premium.
For a Brazillian contact, this is place that specialises in these Motors, both from a service but also performance standpoint: ..:: Rasch Motoren - Diesel Performance ::..
(don't expect them to speak anything but Portugese however..)