The Ford 8N tractor was the successor to Ford's 2N tractor and was manufactured between 1947 until 1952. Testing the ignition coil can be accomplished using a combination of two methods. On all vehicles, ignition coils amplify the spark so that it can make the jump at the spark plug gap; Ford 8N tractors are no exception. An ignition coil either works or it doesn't, although a weak spark can indicate a coil that is beginning to fail. You can do a primary test using simple tools; however, if you notice a weak spark, a multimeter is necessary.
Things You'll Need
- Multimeter, or ohm meter
- Socket wrench
- spark plug socket
Remove one of the spark plugs using a socket wrench and a spark plug socket: the forward-most plug is the easiest. Place the spark plug end back into the wire. Put on a pair of work gloves at this time.
Place the end of the spark plug against a ground such as the engine block. Have someone crank the engine while you hold the plug against the block. If the coil is working, there will be a spark. If the spark seems weak, test with a multimeter. At this point, replace the removed spark plug.
Locate the ignition coil. The coil wire attaches to the center of the distributor cap. Follow this wire to the coil. Original Ford 8N coils are six volts and square, while most aftermarket coils are cylindrical and twelve volts.
Set the multimeter to the ohms setting. Place the black prong to the negative coil terminal and the red prong to the positive coil terminal. This will give a resistance, or ohm, reading, which, according to the My Ford Tractor site, should be approximately 2.2 ohms for the six-volt system and 4 ohms for the 12-volt system. The battery must be connected to perform this test.
Replace the Ford 8N coil if it does not pass this test.
- Photo Credit Creatas Images/Creatas/Getty Images
Bad Ignition Coil Symptoms
A bad coil can cause the engine to idle and run rough. It might feel weak with a tendency to stall, and...
8N Carburetor Problems
Instead of attempting to troubleshoot your carburetor without knowing what the problem is, consider the different sources that may be contributing to...
How to Check Out Tractor Ignition Coils
Ignition coils supply the distributor with high voltage electricity to fire the spark plugs. The coil consists of a primary winding (coil...
How to Test a Ford Ignition Coil
Testing the resistance across several terminals on your ignition coil is the only safe and accurate way to tell if the coils...
How to Set the Points in a Ford 8N
Setting the points of an 8N tractor is the process of adjusting the gap between two parts in the distributor. Understanding the...
How to Test 12 Volt Ignition Coils
An automobile ignition coil acts as a transformer, having a primary and secondary bundle of wires that create and send an electrical...
How to Operate a Ford 8N
The Ford 8N is a vintage four-cylinder tractor that has four forward gears and one reverse. It is equipped with a PTO...
How to Convert a Ford 8N Tractor From 6 Volts to 12 Volts
Converting a Ford 8N from a 6 volt to 12-volt electrical system may not be as difficult as you might expect. For...
1950 Ford 8NB Engine Specifications
The 1950 8NB was a tractor unit used in the agricultural industry. It used a three-point hydraulic lift originally designed by Henry...
Ford 9N Tractor Tune-Up Specifications
The Ford 9N tractor made its debut in 1939 and became heralded for its incorporation of the three-point hitch design for implement...