My international dozer TD 6 Gas to Diesel engine won't.....

Hello
I have a [b:6b23697ff6]1949 TD 6[/b:6b23697ff6] international dozer crawler -just purchased.
I am unable to start the engine on gas. I have electricity, magneto, and when I pull the lever back and attempt to start the engine it won't start. However, there is electricity; there is fuel. The firing order 1-3-4-2. When a pour some gas in the intake the engine will run until the gas is used, then the engine stops.
It is clear to me; the engine is not getting gas through the intake to the engine. With everything working; electricity, fuel, could the only problem be the valve(s) (how many are there) in the intake not opening? I don't know where else to go, and if that is the case, how do I correct it? What do I have to do? Anyone with knowledge explain, I will remain appreciative.

This may or may not be your problem. Some years ago my IH 650-D would not run on gas. What I found is that the butter-fly that opens the intake manifold to the carb was stuck closed. I think it is pulled open by a spring when you switch to gas. Check that this flips open when you operate the starting/run lever. Just something simple to check. Al

While aj may be right I am inclined to think your float may be stuck in the carb. If you can pour gas in and it runs seems that gas is just not getting past the float. Pretty easy to check ,most of the bowls have a drain if not just remove the bowl and check for gas flow. In any advent if it runs when pouring gas you are almost there can,t take much to get it going. Just be prepared you will work on it as much as you run it if you keep it around.

There is also a plunger valve at carb. that works off linkage it may be stuck.
traper

To answer each person: I think the problem may very well be the butter fly that opens by mechanical linkage -when the lever is pulled back to start gas. I removed carb, piece between carb and the intake, and everything is working okay. Putting the thumb over the inlet hole and filling the bowel with gas -slowly- I could see the float rise, shutting off the gas. Taking my thumb off the inlet hole no gas escaped the bowl. The float is made of cork, it is old and has many cracks, though it still works. The linkage rod that opens and closes the float valve concerns me. When lever is pulled back the float valve is not all the way open. When apart, I marked the side of the carb and the linkage rod where the float was fully open. Putting the carb on, the linkage, and then pulling the lever back -all the way, I observed the linkage rod went past the mark a ways. There is the metal rod that extends to each end of the intake. When the lever is pulled back the rod turns up -I think opening the butter fly valve. When pushing the lever forward, there is a snapping sound and simultaneously the rod turns down. This is why I think there may be a problem with the butterfly plate sticking. However, if the butter fly is attached to the rod then why would it not turn with the rod? Question: Do I have to remove the intake to get at the butter fly? And what is the procedure?
I think this is a good forum and works well. Helping each other is what its all about. Thanks in advance. Thank all of you

Thomas, If I remember correctly, there is a Y-shaped bracket the opens/closes the butter fly. On my 650, the rod that goes between the "Y" was not pushing it up. I pushed the "Y" up with a screw driver to get it lose and then put some penetrating oil on it. Now before I try to start it in spring, I always check if it is lose by just moving it back and forth a few times with my fingers. If you can move the butter fly, then that's probably not your problem. But I suppose the valve inside the intake manifold could have broken lose from the rod that operates it. Never heard of that happening. Al

Not sure, but I think if you poured some gas into the intake manifold by the air-cleaner, the engine might run even if the butter fly is closed. On a diesel, the intake would be wide open to cylinders and if the starting valves are open, then I think it would run until it uses up all the gas. So I would still lean to the butter fly not going open. This problem had me fooled for quite a while on my 650 before I figured out what was wrong. I even put in new plugs and pulled it but no fire. Once I got the butter fly to open, it fired up on the starter instantly. Al

Thanx. This morning, I moved the rod, back and forth, many times. Worked the Y back and forth exercising the spring. Afterward, I sat and attempted to start the engine on gas. It fired ignite a couple of cylinders, and then died. after a few attempts, I realized that the engine was now getting gas. Through trial an error, I figured the timing in relation to the plug wires on the cap were 180. So the engine was firing 180 out.
I reversed the wires on the cap, and then started the engine with success. However, it wasn't operating good enough. So, I went to the gears, inside the mag, and moved the larger gear one tooth. Started the engine and it started, operating good. Had no problem switching to diesel. Relief, relief. Now, I am to trouble shoot the generator, as there is no movement on the amp gauge. The voltage reg. is new. So, will test the gen. for output.
Thanks AL, for your input. I remain appreciative. Thanks to all who gave there input. Tho

Have one other thing. The mag. When turning off gas and open for diesel, the spark must be stopped. Is this by the wire from the intake end to the side of the mag? Pushing the gas lever up, and the linkage to the intake goes to the wire that goes to the side of the mag and kills the spark. Any knowledge/help here?

Thomas, I am glad to hear that your TD6 is now running and it was a simple fix. Your question about the mag. Yes, when you switch to diesel, there is a switch inside the intake manifold that grounds the mag to shut down the spark. Some times this contact can go bad, but then you can still ground the mag with a switch. I think this was done so the mag would not have to be sparking when running on diesel thus saving the points and plugs. Just send me an email if you have any more questions as I have an MD, 450-D, and 650-D. Al

PS: Many years ago my neighbor had a WD9 that wouldn't start on gas. Turned out his kid put new points in the mag and also got it 180 out of time. Took me a little while to figure that one out as I didn't expect it to be out of time. So that is easy to do.

Thank you. I don't know how a person does the e mail thing/ or how I find your e mail? Thanks again for your input. I am confident I will be blessed with more concern as I go along.
Tho