860 Sputtering Under PTO Load

ThadS · Apr 29, 2013

I have an 860 with Ford front end loader and 250# rear wheel weights.

The tractor is the original 6V system and runs like a charm blading, plowing, discing and using the front end loader.

However, if I use the PTO for mowing the tractor will run for an hour or so and then start sputtering and die as if it is starving for fuel. I can usually see fuel rushing into the sediment bowl. The problem gets worse going up an incline (heavier engine load).

I have replaced the fuel shut off valve, and cleaned the tank out somewhat so the screen is clear. The temperature gauge is usually a 1/3 of the way into the green, which is not a very good indication of what the true temperature is. I can feel the heat coming off of the engine pretty good. I have not completed a compression test, but the fuel tank has it written on it and the cylinders range from 90 to 100. I replaced the points, condenser, and coil last summer.

I am not sure what to check or try next. With mowing season starting up it is inconvenient to mow in small spurts. I am hoping that some of you experts can point me in the right direction.

Thank you in advance,
Thad

Anonymous-0 · Apr 29, 2013

When it quits remove the sediment bowl and see if you have a steady flow of fuel. It sound as if the fuel line is overheating or the gas in the tank is. Regular gas today has a prety low botiling point.

showcrop · Apr 29, 2013

It sounds like you must be getting fuel, but you should still check for good flow. With the tractor cold take the drain plug out of the bottom of the carb and ascertain that the fuel will run strongly for a good thirty seconds. You also need to verify spark immediately after it quits by removing a plug and grounding against the block then crank the motor. you need a spark that will jump 1/4 inch.

old · Apr 29, 2013

Carefully remove the gas cap and make sure the gas is not boiling or the tank vent is clogged. Either will cause that. Also is the fuel line factory or other then??? Fuel lines can and does get hot and that in turn causes the gas to biol in the line and that will cause that problem also

ThadS · Apr 29, 2013

I have removed the gas cap to add more fuel and the gas is not boiling.

It is the original gas line as far as I can tell from the parts manual picture.

Thank you,
Thad

jeff pk · Apr 29, 2013

If it happens when the engine is at its hottest, it's possible there's a crack in your exhaust manifold or a leaking gasket that only opens when very hot---this will cause surging

sotxbill · Apr 29, 2013

vapor lock... look it up.

Jimmyjack · Apr 29, 2013

Check the archives, this model has a history of
problems like you discuss, and moving the gas line
around the engine instead of behind the manifold
helps. Its too hot there with the ethanol gas, if
you havent done so, switch to ethanol free and raise
the boiling point and help eliminate vapor locks.

souNdguy · Apr 30, 2013

if you see fuel 'rushing' into the bowl.. there is some sort of feed problem.

check the tank tap, vacume.. is it the oem fiel line.. or a farmerized one ran too close tot he manifold or some convoluted route?

someone scab in a fuel filter?

ThadS · May 12, 2013

I believe that it is the original fuel line. I ordered a heat sleeve from DEI and placed it over the line. The problem has really improved. I mowed most of my property over the weekend with out any issue, and then i developed and oil leak. I'll make a new thread to inquire about that.

Thank you for all the help.

860 Sputtering Under PTO Load

ThadS

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Anonymous-0

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showcrop

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old

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ThadS

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jeff pk

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sotxbill

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Jimmyjack

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souNdguy

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ThadS

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