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Not familiar with the TD-6, but have a WD-6 which should have the same engine. To start the engine, close the diesel throttle all the way, and move the gas lever to the start position. Start like a normal gas engine, choke, etc. Once the engine has warmed up on gas (a few minutes if the weather's warm, longer if the weather is cold), move both levers to the diesel position. If it doesn't catch, go back to the diesel off/gas on position & try again. The engine depends on inertia to start on diesel, so you have to be fairly quick in the changeover. If its smoking badly in the gas position, the diesel throttle may not be completely shutting off fuel to the injectors. I believe there's an ajustment for this, but would have to go dig out the manual to tell for sure. Diesel in the combustion chambe would also make it hard to start on gas. These engines have a third valve that opens when running on gas. This connects the combustion chamber to a smaller chamber containing the spark plug, and reduces compression by increasing the size of the combustion chamber. These valves are operated by the gas lever. Some people say to switch back to gas before shutting it down. I just close the diesel throttle & have never had any trouble starting it again. If you're working it, make sure you let it cool down before shutting it off, the heads on these engines have a habit of cracking if they're shut off hot. On my WD-6, the gas lever is on the left and the diesel throttle is on the right. Push both down to start in the gas position, move both up to run on diesel. Can't help you with the steering clutches. To find the year, look up the serial number under "Serial Numbers" on the left hand side of this page. Good luck. Those are unique old engines. Keith
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