Question about Ford 8N Tractor

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My ford 8n was running fine until just recently while mowing it shut down and will not restart. I have good spark on all plugs, good compression on all cylinders but no matter how long I crank the plugs never seem to get wet with fuel. I drained and cleaned the fuel tank thinking maybe it was bad fuel. Sometimes while cranking it will backfire through the carburetor but never do I get any firing from the cylinders. The carburetor was also rebuilt a year or so ago. Ideas? Thanks, Tim

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These are gravity fed there is a chance something is pugging the outlet hole I would disconnect the fuel line and see if you have flow if not take the cap off and use air to blow back up into the tank to free up flow again

Posted on Dec 04, 2017


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Posted on Jan 02, 2017

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SOURCE: 1989 Full Size Ford Bronco 302 won't start

This happend to me before. Go back and check the firing order and make sure the spark plug wires are in the right place. A Chilton auto repair book for your vehicle, available at many auto part stores are really helpful. Check the rotor and distributor cap also and make sure they seat properly. Assuming the distributor itself has not been removed it should start. If the distributor was removed from the vehicle and not installed in the exact position it was before (maybe a couple of notches off) you will have to find top dead center on the compression stroke on plug #1 and check to see if the rotor is pointing at the at plug wire #1 on the distributor cap. The distributor itself can be adjusted by loosening the locking nut and turning it slowly clokwise or counter clokwise to ****** or advance the spark. make sure all your vacume lines are in the right place also. All these procedures can be found in the book.

Posted on Apr 27, 2009

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SOURCE: Ford 8n won't crank name is Keith..and the 1st things that i would check is to make sure the battery terminals and cables ends are clean..if they are..i would check to make sure the ground wire and where it connects to the frame is clean and rust free..and if they are in great condition....i would suspect the starter solenoid..i'd make sure all the connections are clean on it..and if it still dont work after you cleaned it...i would replace the solenoid..i hope this helps..and there could be other if it dont solve your problem..write me back

Posted on Jun 30, 2009

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SOURCE: wont start

Check your rotor, distributor cap, coil wire.did you change the module inside the distributor cap.

Posted on Jul 20, 2009

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SOURCE: Ford 8N will not start when hot

This sounds like a bad fuel pump to me. The only way to be sure is to check the fuel pressure when cold, probably around 45 PSI. Then when it get hot it will drop way down to 10 or 15 PSI. Check the pressure if you can, or change the fuel pump.

Posted on Aug 14, 2009

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SOURCE: I have an 8n ford tractor,I have good blue spark

Choke working OK? Try a scooch of starting ether in the breather----not too much or might blow the head gasket.

Posted on Feb 27, 2010

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Cant get 8n to run. starts but misses. new plugs, crb,distributor, coil, tank shut-off, ign switch, ceramic resister, ballast resister, fresh gas, but has power to ign switch whether on or off.

If it starts but misses meaning it runs but not on all cylinders?.....then,
Are the spark plug wires in the correct firing order?
Are the spark plug wires in good shape?
Is there compression on all cylinders?
If a valve is bad it won't fire smoothly.
If you pull the plugs are any black with carbon?
(a black carbon coated plug will not fire,especially with a 6 volt system)
Is the distributor car attached fully and correctly?
When the distributor cap is off,is there any side play in the distributor shaft?
Is the point gap correct on the points?
Start the tractor cold and feel the spark plugs,the one or two that are colder than the others are the missing cylinders,if two are cold you could try switching those spark plug wires with each other,in case they are mixed up,and if two are missing are side by side you could have a head gasket leak between cylinder problem.
TIP 1, the BEST THING to do on a Ford 8N is to convert it to 12 volts neg ground.Add a alternator,(76 chev pickup alt fits good) leave the starter as it is (it does care if it's positive or neg ground or 12v) and add a 72 dodge ignition resistor in line to a 12 volt coil.(unless your new 12v coil does not need a resistor)
This set up will increase your fuel economy,add power and start instantly in any temp.
TIP 2,you can use unleaded fuel in a Ford 8n as it already has hardened valve seats.
BUT 10% Ethanol fuel is BAD,it can be used, but shut off the fuel at the tank and let the tractor carb run dry before shutting it off if you are not going to use the tractor with in a few days.

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1 Answer

My 8N burps and shuts down after about 5min of running

Is your gas cap vent open. Or your resister near your distributer maybe getting bad'.

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1 Answer

I have a YTH2454 three years old runs fine for about an hour then shuts off won`t restart until completey cooled down,i have used my leaf blower to clean engine , just today i put new air filter and screen...

the coil that attaches to the spark plug wire may need a replacement for usually when they get old the heat will make them weak after the engine is running causing a problem such as yours here

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I had a similar problem lasy year.
Try this:
As soon as the machine seems to be stalling, loosen the gas cap.
If the engine continues to run, clean the gas cap vent hole(s).

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1 Answer

Van stalls and will not restart. New electronic Modual, new fuel filter, plugs, wires, cap and rotor, fuel pump, everything I can think of. Compression varies from a low 80 to a high 100. Have...

Check the ignition coil, it could be overheating and shuting down = by the time you get to test spark it's cooled enough to work. The compression is low but it still should run. You could also check to see if the EGR valve is sticking open as this could cause the problems. good luck!

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1 Answer

Crafstman riding mower cutting off now won't start at all

The two most likely suspects for the symptom you describe are:
a) Ignition coil failure under high heat.
b) Decompression failure due to normal wear.

For a positive diagnosis try the following:

For scenario a)
Run the engine until it shuts itself down. As quickly as possible, check for spark using a spark tester (availabe at local auto parts store). If no spark when hot, allow to cool down and test again. If good spark when cold and no spark when hot, change the ignition coil.
Proper part number (assuming your machine is still all original) Briggs & Stratton part #492341.

For scenario b)
Run the engine until it shuts itself down. Try to restart but pay close attention to the speed of the spinning starter. Next, remove the spark plug and spin the engine over (WITH SPARK PLUG WIRE WELL OUT OF THE WAY!!) If the engine spins super fast and free you can discount the theory of a bad battery and you will need to adjust the valve lash.

Determine which is the case and reply to this post. I will gladly give a detailed explanation of the valve lash adjustment procedure in another post.

Hope this helps!

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1 Answer

I have a craftman lawn tractor with a 15hp kohler engine. Engines starts and runs fine After mowing for a while and then shutting it off the engine will not restart until it cool off completly. Any...

See if there as any difference in compression when the engine is cold verses hot. Also check ignition spark when it is hot. Unit could be vapor locking because of heat. Carb float could be suspect.

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