8n ford wont start when hot, plugs are dry, dont think its fuel, ethar does not work.needs to cool down 45minutes to start. starts and runs great when cold.does not steam or boil over.stalls easy when hot and runs awful.
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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.
I think that cooling off is doing it,I think your gas is filling you carb bowl,remove you carb and take bowl off ,I would buy a kit,I have had problem with the floats sticking or have been damaged by water freezeing,that carb is easy to rebuid you will do good and you will have the pride of fixing it ,good luck and thanks
Spark to plugs is great?.....but if they are black (carbon coated) it may not start. Crank her over and use that choke for 30 seconds. Pull the plugs ...are they wet with gas?Smell it....is it water or gas. They should be wet with something. Are they dry.........No fuel.
If they are wet with gas and NOT black carbon coated and you are SURE you have spark..........time to tow it to start. You want to turn the engine fast enough to have the crank throw oil onto the cyl walls. Engines need a oil coated cyl wall to run....to seal the rings.The gas from flooding the engine washes the oil away.Put it back and it should fire up.After the first start...it should be OK. I've started many a engine that others could not start (flooded or sitting for years) with a little oil in each cyl to seal it.....but towing is the better choice if possible.
This is everything that i know that will make an 8N run hot...a stopped up radiator(inside)..a radiator that is filled with debris in the cooling fins..a bad thermostat(located in the upper radiator hose..if it has one).....a stopped up block..bent fan blades...fan shroud missing..a bad water pump..the fan belt slipping on the water pump ..a blown head gasket..low coolant..i hope this will help and one of them should fix it ..if not...please write me back
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.
Could be a bad condensor or coil, flaking out when they get hot. If it starts ok after it cools down about an hour and is cold, then very likely the problem. www.Ford8n.com would have everything you need for replacements.