Massey Ferguson sold a variety of tractors with the AD3-152 used as a power plant. Quite a few were well over 40 hp. I've got one in a MF150 that will dyno 47hp now, although it was originally rated at 38pto.
Back in the day when the AD3-152 was a new engine, so I've been told, the British Gov levied a tax on engines based on HP. 40hp was a break off point, so engines would routinely be "de-rated" to less than 40 as a way of avoiding paying so much export tax.
The Perkins AD3-152 was rated well above 40 on several 200 series Massey's.
and, for the record, the Perkins in your AC was built by .....Perkins.....which was at that time, owned directly by MASSEY FERGUSON....So MF got 40 hp out of YOUR Perkins!
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