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Need help with tuning

W

WY JERRY

Member
My VAC will start and run, but only for a while. As soon as it starts, the outlet of the carb gets real cold, or frosty. Running 10 or 15 minutes and the engine stumbles and dies. Kind of like what pilots call carburetor icing. After enough time for the intake manifold to warm up again, it will restart and sound fine. Then the process is repeated.

What is the cause of this and what do I do to correct it?

The carb is a MS TSX 114. Distributor ignition.

Thanks
 
The cause of this is the heat absorbed by the vaporizing fuel. When the manifold is not yet warmed up, the cooling effect of the vaporizing fuel can cause the water in the air to freeze on the outside and the inside of the intake manifold, restricting it. The problem is worst on warm days in the winter, when the air is cool and moist. The solution is to allow the tractor to come up to full temperature before using it.
Also, the problem is made worse by the increasing presence of ethanol in pump gas and by water absorbtion products like "heet" and "stabil," since these contain alcohols which have a much greater heat of voporization than gasoline. It also helps to have a good thermometer installed in your tractor. Additionally, be sure to wait until the engine is fully warmed up before tuning the carburetor. Otherwise you may tune the carburetor rich, which will make the problem worse.
 
Is this a new problem? The icing may be an unrelated symptom.

Have you tried removing the air filter and repeat the test. An obstructed air filter could cause some of the icing.

Also, with the tractor off and cold open the fuel drain on the bottom of the carb. You should be able to see a steady stream gas that never slows. I had an obstructed fuel line in my DC that would cause it to run for a few minutes before stalling.

Good luck troubleshooting.
 
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