The valve to close off the air flow to the diesel inlet ports in the head is in the manifold. If you have the manifold off, you'll get suction in the diesel position because the decompression valves are closed and isolate the gas ports. If you open the decompression valves, both chambers are now connected together and you won't get any vacuum on the gas port unless you cover the diesel port.
Couple more things to check. Make sure the linkage that operates the butterfly valves in the manifold is working properly. If everything thing is switching like it should, then you're down to basically troubleshooting a gas engine.
Start with the basics. Is there spark? There's a contact on the changeover linkage that shorts the magneto on the diesel position.
Assuming you have spark, check for gas in the carburetor. I've had to clean the inlet port on my WD-6 (same engine) carburetor a couple times. One of these day's I'll get sufficiently ambitious to overall it. Also check to make sure that there's gas in the starting tank and the shutoff valve is open (yes, I know its a dumb thing to ask, but its happened before).
With the starting lever in the gas position, gas should drain out the bottom of the carburetor if you open the drain valve. If it doesn't, something is clogged, or there's a linkage problem. There's a mechanism that lifts up the float in the carburetor to shut off gas flow when you're running on diesel, and you won't have any gas in the carburetor if that's not working (or its in the diesel position). Took me a while to figure that out one time, as I didn't seem to be getting gas in the carburetor. Might be another place to check.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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