I think the D436 is an IHC engine, either that to a Russian jet aircraft engine, my money is on binder.  Ought to be parts for something like that.  Looks like Amazon has them for $109.05.

LOOKS LIKE AN AC G153 ENGINE.

THE SIX CYLINDER VERSION WAS A G230

WHEN AC MADE THE DIESEL VERSION THEY USED D INSTEAD OF G IN THE MODEL.

MILITARY LIFTS WERE OFTEN A LITTLE DIFFERENT THEN REGULAR PRODUCTION

THUS ENGINE MODEL COULD BE DIFFERENT.

TRY G153 FOR MODEL

That is a Waukesha D436T.  Like Jim says... Waukesha made their industrial engines on a lower end foundation to be set up as either spark ignition (gaseous or liquid carbeuration) or compression (diesel injection)... just change the head, induction, and replace the distributor with injection pump, and it's good.

Waukesha and Hercules (nee White-Hercules) were substantials suppliers of multifuel mil-spec engines, so many machines you see in military surplus will be Herkys and Wookies. 

In order to meet the spec (thus, win a contract), manufacturers would do many things... first, is to redesign, or build from scratch, a machine using major components that have already MET that spec in some other machine.  Example:  Let's say I I worked for a forklift manufacturer like Allis, and competing against Hyster, Yale, or Higgins, and wanted to win a 10,000-unit contract for a 20k forklift, I'd look at machines that were ALREADY in the supply chain... like a carry-deck crane, or an aircraft tug, or a self-propelled flightline container loader... and see that they all used a Waukesha D436T.  What I would do, is take my machine design, and alter it to accept the D436T, and then send a request for quote to Waukesha for the D436T to suit mil-spec.  They're already BUILDING the power unit, so they should be able to give me a very accurate production lead time and price for a quantity of 10,000 units.  By doing that, not only am I assured that I'll meet spec, I'll have very accurate costing AND... when I hand over my bid paperwork package, I'll have a complete list of required spares that has ALREADY been analyzed and approved prior, so MY BID will get processed much faster, AND, since that particular branch or outfit already HOLDS the part stores necessary to maintain this engine, they won't NEED to make an additional purchase, so the opportunity cost for MY offering are substantially lower, hence my chances for winning the contract are much, much, much higher.

You will also see military suppliers do one other thing:  Sub the whole thing.  Here's an example:  Consolidated Diesel Electric is the name on all the badges of my big 35kw generator.  It has a 338ci Hercules JXLD inline six, driving a Kato generator head, and had a big huge control cabinet with enough relays to make a Bally pinball machine feel naked inside.

Consolidated Diesel bought basically the whole thing from Kato... everything but the contents of the big box full of relays... they had another outfit make all that, and SEND it to KATO, where the thing was wired up, fired up, and tested.  Then they had Kato slap CONSEC badges on it, and put it on trucks to the contracted points.  KATO picked the JXLD because it was the same engine base used in a bunch of military vehicles.  Consec selected KATO because they'd already appeared in many mil contracts...  The goofy part, though, is that KATO bidded on the same contract, and lost to CONSEC (probably because they offered a better control system at a higher cost, which in the end, would have been a better choice because the CONSEC strategy was to chronically underbid jobs to 'win' them, then 'up-scope', and sue for the difference... after.

And again, I digress.  You have a Wookie.  Good engine.  Does it run?  if so, put it back in and run it hard... Great engines.

When comparing, ignore EVERYTHING from the top of the block UP... this all changes from compression to spark ignition.

Look at the LOWER END.  Notice to left of dipstick- protrusion in the casting for oil pump system.  It's a very unique shape....  Waukesha. 

If it has an AC badge on it, it's because they PUT it on to give it proper military/government contract ID.

Not AFAIK, John.  Deere went into a partnership, with Caterpillar.  Cat was going to show them how to make 4-6-8 cyl motor castings, Deere was supposed to stay out of the construction equipment market...  We all know how that worked out...

IIRR, White bought Hercules, and ended up in Agco family...