iveco engine identification?

my iveco daily appears to have had an engine change. how can i find out what model engine is now in it, the engine number says it's an 8140 but how do i find out more about it as there seems to be a variety of 8140's including 2.5 and 2.8 turbos....or am i wrong? is there any difference between fiat iveco's and ford iveco's?
buying parts from the dealer is done on the reg plate so as the engine doesn't match buying parts is proving difficult,
thanks all