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Ford 9N, 2N & 8N Discussion Forum
:

runs but dies with pto

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Ryan Mazingo

09-16-2004 09:49:24




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I have an 8n that runs good, but when I engauge the pto it will go forward and the pto starts to turn, but after it gets up to speed it dies like its got too much load on it. It also dies when its run in High gear ( 3rd or 4th) after about 5-10 seconds. the engine runs strong, but when the pto starts it just dies. The tractor ran fine, and I cant think of anything I did that would cause it to do this. Any helpful thoughts? Thanks

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Dan

09-16-2004 12:33:12




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 Re: runs but dies with pto in reply to Ryan Mazingo, 09-16-2004 09:49:24  
My 1952 model used to do this before I gave it more gas via the main fuel adjusting needle on the carb.

Good luck,
Dan



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Rob

09-16-2004 10:39:04




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 Hard pull test in reply to Ryan Mazingo, 09-16-2004 09:49:24  
There is a quick test you can do from the seat that will find or eliminate a lot of problems. Warm the tractor to normal operating temp. If it won’t warm up or maintain a constant operating temp then the thermostat might be bad or missing.
Idle the tractor in high gear and get her rolling forward just a little bit. Then quickly pull the throttle to 1/2 speed. Do this with your good brake partially on so that you have a heavy load on the engine. If the clutch slips then you’ll have to adjust or replace it.
1. Your timing is ok if you hear a constant slight pinging (spark knock).
2. If it backfires the fuel mix is too lean, the ignition is shorted, or you have sticky valves. Back out the main jet 1/8-turn at a time to see if that cures the backfire. Pull the spark plug wires one at a time and watch for a regular spark without a miss. You can hear sticky valves.
3. If it doesn't ping set the timing and make sure the mechanical advance is free to operate. The weights may be dirty and sticky.
4. If it pings excessively then set the timing. If that doesn’t correct the pinging then pull all the plugs, clean them, and set their gap. While you have them out take a compression test on each cylinder with the throttle full open. The spec is 90psi minimum with 10% from highest to lowest. If you have 140psi then pull the head and remove the carbon. Make sure the valve stems are not gummy. Low compression indicates leaky valves, bad rings it’s a rebuild that isn’t broken in yet.
5. If the engine pulls evenly and there is no indication of late spark or excessive carbon, check the system for a lean fuel mixture.
6. If the engine pulls unevenly then check the spark at the spark plug boots. Watch the spark over several revolutions to see that it's a regular, blue, snappy spark and that it does not miss. You can do that while the engine is running.

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MikeT

09-16-2004 10:19:29




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 Re: runs but dies with pto in reply to Ryan Mazingo, 09-16-2004 09:49:24  
Is this just when something is connected to the PTO?

My first thought was the governor. You could test that by disconnecting the throttle shaft from the carburetor and moving the carburetor throttle by hand.



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Rick H. Ga.

09-16-2004 10:17:50




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 Re: runs but dies with pto in reply to Ryan Mazingo, 09-16-2004 09:49:24  
It sounds like it is starving for fuel under a load. Check the fuel system for adequate flow. There is a filter screen in the top of the fuel bowl and one at the carbuerator inlet. If that doesn't fix it it might be time for a tune-up. HTH. Rick H. Ga.



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