6.9 was a diesel built from an exisiting gas-engine platform by International Harvester. Later 7.3 was the same engine with a slightly bigger bore until mid-1994. Powerstroke 7.3 that came out late 1994 was an enhanced and modifed version of the original IDI 7.3. Many companies built diesels from exisiting gas engines. GM, Isuzu, Hercules, Continental, and many more. Most were fine, but the early GM Oldsmobile 350s not so good.
I've seen several IH tractors with 6.9s - all home built. No pictures. Here are a few of a GM 6.2 in a Massey Ferguson. 6.2 came out about the same time as the 6.9, but was a weaker engine with a lighter block, timing chain, and a cast-iron crankshaft. The IH 6.9 had a heavy block, forged-steel crank and gear-drive cam.
As to stories about turbo 6.9s being great on fuel? You "can't make a silk purse out of a sow's ear" and the 6.9 was just an indirect injected diesel using the Ricardo Comet system, just like the GM 6.2s and 6.5s. Ford DID put a turbo on the 7.3s which are basically the same engine. No, not great on fuel. I'm still driving my 85 F250 with a 6.9 as well as my 1994 turbo 7.3. Ford used the ATS turbo system.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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