Is this a 230 or 262 engine?

Definitely not a D14 air cleaner - too big.  Tractor was most likely a diesel that someone replaced with a gas engine and moved some components around - including the air cleaner.

JC-WI wrote: The air cleaner looks like something off a D14? or a power unit? The intake is about the size of the WD's intake pipe.  The location of was determined by the previous installer, and the hood still has the front hole. Power steering pump arrangement does look like that of a D19 Manifolds are certainly different than from an A Gleaner 230 engine.   SN is D17 7640D ... Tractor 1958, block first month of 1959. Close in age. lol Was looking at the chart and see the 230 could produce 73HP at 3200 rpms and 164 ft pounds at a thousand rpm, with 6-1 comp. ratio, just think what it could have done at 8-1. To bad AC didn't make a thicker top deck to the block and a wider liner ledge when designing the 262, it could have withstood the test of time.

Tramway, as the doc said, it is of the tractor variable speed governor.

  There is another D17 in our area that was changed over to the 262 gas motor from a combine and they had to hunt down a governor assembly for that one. That got changed in about 1979 and still in use, but the owner says it is really hard on gas. He uses it for cutting and baling hay but has a smaller tractor to use for raking the hay.

Brendan, your 230 engine looks really clean.

 I went and checked the gray engine A Gleaner I have and serial number is A-40361. Can't find any serial number breakdown of years for the Gleaners.

  Just for note on the specs of the Buda / Herc engines used  ,  the book I have said the Herc used was the 3 7/16th x 4 1/4th with valve in block while the later Buda engines used in the Gleaners were the 3 7/16th x 4 1/8th ". The QXLD engine was 7 cubes larger than the Buda used. Hercules did have a 230 engine also, a QXD. Difference between them was the QXD had the 3 7/16x4 1/8 that was 78.4hp @3200 with max torque of 167@1500 ... while the QXLD had 92hp at 3200rpm 190@1400rpm

  As for this D17 with the earlier Buda engine, I have had it started and it runs. But the throttle linkage seems really off to the throttle lever, first quarter of quadrant it seems like it is full throttle and any farther that engine seems like it has no stop to the upper rpm's.  Governor linkage looks like it has many kinks and a weld in it, so... somebody has played with it.  I don't like over speeding engines, so need to put some kind of a tach on it to see what it really is running.

   Tires on the tractor are 14.9x28 and are full of fluid and they appear to have been leaking for a long time. Replaced the valve core on the one side and the fluid was over the top of that... sprayed out some from core hole, wasn't bad.  Then had to replace other core only to find the core corroded and had to remove the insert to replace. That was not the screw into the tube kind, but the style that is held by the threaded collar which was also rotten and broke when trying to loosen it.  Once that broke, tried to keep stem in tube while trying to remove collar and... stem blew out and a stream of chloride insude. Shoved new stem in and was able to crack the old collar and peel it off and then threaded the new collar on.  Then took a shower to get rid of all the chloride off of me.  That makes 6 tires that I have worked on in two years that have had fluid over the top of the valve stems. These two I didn't take time to remove the excess fluid from them. From the previous 4 tires (set of 18.4x34 and a set of 18.4x28), I removed about 60 gallons. Is that the norm for the tire shops to over-fill tires? 

   Have to see what a D19 book says about the governor and see about maybe setting a limit on top end rpm.

As best as I can tell, your A2 combine would be a 1967 (last year for the A). There is a chart in Norm Swinford's book that lists serial numbers and years for the Gleaner combines, that's where I'm finding this information. Hope this helps, good luck with your tractor!