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MD shut down issues

A

Anonymous-0

Well-known Member
My Md runs nice on diesel and switches back to gas, but continues to run (sputter) after gas has been turned off. It almost shuts off and then lingers. Shouldn't it stop running completely, or is this a normal phenomenon? It has a new float in it.
 
If the ignition is shut off, the engine should die immediatly. If it a Mag, the mag kill switch might be inoperative, or the manifold switch not working. If you turn off the gas, it will run for as much as a minute and sputter to a stop as it runs out of fuel. Turning off the fuel and letting it die this way is good if it is going to be a while between periods of operation. If you will be running it even weekly, I would shut off the fuels after shutting off the engine, leaving the gasoline in the carb. Jim
 
Thanks for your info. Tractor does have a mag, no ignition switch. It used to completely die after about 40 sec. when gas was shut off, now it tries to die but sputters (with some white smoke) for a few seconds. Nothing really major, but it used die w/o sputtering.
 
Mine will stumble a bit shutting off gas. The white smoke would seem to indicate the diesel pump is not entirely shut down but perhaps the carb needle valve is dribbling a bit. When they are this old, the possibility list gets pretty long. :roll:
 
There is a Mag grounding switch on the intake manifold butterfly control shaft that should shut off the mag when it is in Diesel. A secondary grounding switch could be used to shut it off if you want to, but it still needs a minute or two to idle before stopping to allow heat to normalize. Jim
 
May check the fuel shut off valve by taking the gas line loose to see if it drips. Float and needle should have no effect when shutting gas valve off to stop engine because fuel is pulled out low enough so the needle is open anyway.
If the deisel doesn't shut off completly I don't know if there would be enough compression to run with the starting valves open. Maybe if hot enough. If it slowes way down and keeps going I think its gas leaking in.
50 + years later I don't think a lot of people think about some MD tractors never had a kill switch, and that IH recomended shutting the gas off and letting them die.
 
I agree with rustred that engine is made to shut off on diesel. The gas is for starting ONLY.
 
If I remember correctly when you turn on the gas it has two butterfyies in the manifold that push down on the float so you get gas to the engine. When you shut the engine off on gas side the float does not close completely. That closing doesn't take place until you switch to fuel side.
 
My MD starts on gas and we switch it to diesel. On the shutdown, we switch back to gas and shut off the ignition. The engine shuts off as it should with no spark knock.
 
I have not found a purpose to switch back to gas, so i wonder what your reasons are. i have heard diff. things but none make sense.
 
Doh! What I get for not thinking about it too much and typing too quick :lol: But yes the gas shut off usually causes a few stumbles on my MD before it starves out. The others are more likely to quit outright.

Dribbling diesel will make them puff smoke on gas. It's a suggestion, not likely.

The manual got an update later on.

I never shut them off on gas anymore. It just doesn't do anything unless you plan on a restart within an hour or less. And even then it isn't really worth it. Tested all these things personally.

To make matters worse, none of mine will switch back after running for more than maybe an hour. The bowl eventually goes dry and it takes too long to refill when switched to gas. It takes several attempts and they want to knock bad when kicked back to diesel. Very harsh on the internals.

The only reason for shutting off on gas to to drain the carb and stop the gas from evaporating in there and leaving crud behind. And if it has been over an hour...
 
I believe I've found the problem. Throttle linkage was not adjusted correctly thus not completely shutting off injection pump. When you hold the arm on the pump manually tractor shuts off with no sputtering and white smoke. As far as shutting off on gas or diesel, it seems to be an unresolved controversy. I have always shut it off on gas cause that's what the book says. It's also been said that shutting down on gas gets a more even distribution of heat thru the head. Anyway, thanks for the responses.
 
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