Engine Swap B7100?

[Erik Graham]

Greetings;

I have a B7100 HST of unknown age, but definitely older. According to the manual and the plate on the tractor it has a D 750 DH engine. I'm not sure if this is the original engine as it has a water pump instead of the convection system that is most common on these tractors.

I have 2 questions. Firstly, is there any place on the engine itself that identifies the type. I found the serial # but nothing else.

Secondly, does anyone have any idea whether a Kubota
D 722 E engine would fit this tractor? There is a used one for sale about an hour's drive from here that has low hours and if it was a fit would give me a substantially younger engine and an additional 3 hp.

Any advise appreciated.

Cheers, Erik

P.S. Forget about asking the dealer. He already snickers when I ask about parts.