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.
May 21, 2017 |
Cars & Trucks