D-15: Info

micheal

GeneD14 - It doesn't seem likely that AC would have put a 160 ci in your D-14 two years or more before that engine went into the D-15. So somebody probably modified it. The interesting thing is: did they also change the head and do you have the same compression ratio as a Series II D-15?, or do you have an engine that's somewhere in-between?

DBosley - A 1960 D-15 would be called a Series I, although the "Series" designations were never applied to the D-XX's until a "series II" came out for a given model.

I always thought that I would like a D-14, but then realized I could get the same engine/HP with better features (true live hydraulics and PTO, remote hydraulics with low pressure-high volume system, but no power director) in a D-10/12. You own both - how do they compare? Are your D-10/12 the 138 ci or 149 ci engine?

In the meantime the D-14 engine with the bore reduced to 3.375" (138 ci) was used in the early D-10/12 which ran just under 30 HP. In 1962, the bore in the D-10/12 engine was increased to 3.5" (149 ci. same as D-14/early D-15)and the PTO HP went to 33.

I grew up with a couple of CA's, and it took a long time for me to understand that the D-10/12 engine was not the same block as the CA (they look the same on the outside and much of the rest of the tractor is derived from the CA). AC engine blocks differ cheifly by the stroke, and they changed the bore often between models/series. The air cleaner on my 149 ci D-12 is the same as a 128 ci CA - I think it has more to do with the available space on the machine than anything else.