TEA 20 - Overheating?

IndigoFarms · May 8, 2015

Hey folks, I have a TEA 20 (1951?) its been really good to me the past year since we bought it, I am trying to plough a small field (50x50) with a 2 forrow plough, but after a few passes my gas tank looks like it has a large build up of pressure and is shooting pressurized gas out though the little vent hole on the cap pretty fiercely not sure if this is normal, I haven't used it for much heavy work aside from moving some sand around, plowing my driveway & grading my trails any thoughts would be great!

DeltaRed · May 8, 2015

Your tank vent is pluged/obstructed.In extreme cases the tank/cap will create a vacume and the tractor will die. Clean(that is
poke small wire in the vent holes) and see if that doesnt help. OR you may need to get a new cap. Gas should not spray!

glennster · May 8, 2015

is the engine running hot? check your ignition timing and also the mechanical advance in the distributor. if it is not working, the ignition timing will run retarded and the engine heats up pretty hot. my minnie moline did that. the gas tank has one bolt that holds the gas tank down.

DeltaRed · May 8, 2015

How would retarded timing cause his problem?Please explain. Thanks

37chief · May 8, 2015

Possible plugged radiator. Drain some water and have a look at the tubes from the filler neck with a flash light. This will give a small indication of what the rest of the tubes are like. Some radiators have a baffle where you can't see. Give it try. Stan

Paul from MI · May 8, 2015

Retarded ignition timing always tends to make an engine run hotter than normal. Timing is retarded to aid starting. If ignition occurs before TDC when cranking it tends to turn the engine backwards, resulting in "kick back" and/or additional load on the starter motor. At running speed the timing is advanced to occur 20-35 degrees before TDC to give fuel time to ignite as the piston starts on the power stroke. Retarded timing does not give fuel time to burn during the power stroke, which requires more fuel input to maintain the output horsepower, thus wasting fuel and creating excess heat. Older engines running on low volatility fuels required more advance than modern fuels that burn faster. Hope this kind of explains it.

glennster · May 8, 2015

delta, i picked up a minnie big mo500 loader backhoe combination several years ago from a buddy. it was his dads tractor. gasser. he said the tractor always ran on the hot side when using the hoe, or heavy loader work. was doing some tile work around dark and noticed the exhaust manifold glowing pretty bright red. opened the main jet a turn or two figuring it may be running lean. didnt help much. went to add fuel and gas came shooting out of the tank, it was boiling inside the tank, sprayed everywhere. good thing the tractor was shut off. did some investigating and found the mechanical advance frozen inside the distributor. iirc the ignition timing should be about 26 degrees at full throttle, this was no where near that. after repairs, tractor runs normal. front right corner of the fuel tank bolts directly to the exhaust manifold, it was transferring all that heat directly to the fuel tank.

DeltaRed · May 8, 2015

OK,I got the Overheating thing.But how would that make the pressure in the gas tank that causes the gas to spew out the vent?

Steve@Advance · May 8, 2015

The exhaust manifold is close to the bottom of the fuel tank. Retarded timing causes the manifold to overheat. The TO35's have a heat shield to prevent boiling the gas.

Might be able to fit a piece of sheetmetal under the tank if adjusting and correcting the timing doesn't do it.

TEA 20 - Overheating?

IndigoFarms

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DeltaRed

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glennster

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DeltaRed

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37chief

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Paul from MI

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glennster

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DeltaRed

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Steve@Advance

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