I don't think it's mislabelled. It looks to me like the "24670" is only for the "M18" motor, which was supplied to Ingersoll Rand, not Case Ingersoll, and not Massey Ferguson.Yes I have looked at that manual. Just was saying I believe it is labeled incorrectly
The M16QS engine spec's out to the factory engine in a Massey 316GTX as found here: Massey Ferguson 316Gtx Lawn Tractor Tractor Specifications
Of course, they say it's "77 hp" which I'm confident is a typo.