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Ford 9N, 2N & 8N Discussion Forum
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Hard pull test

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Author 
Rob

09-16-2004 10:39:04




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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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