In Reply to: ford 8 n misses posted by Jan Grossman on October 05, 2018 at 14:25:31:
Fuel, Spark, and Compression are the three factors required to start and run. Concentrate on the first two items listed and leave compression for last. 9 times out of 10 it usually is one or both of the first two items anyway. It would also help to tell us if you have the OEM 6V/POS GND electrical system or a 12V/NEG GND switchover job. Either way, if the wiring is not correct, you will have starting/running issues. Is it an early 8N with the front mount distributor or the later 8N with an angle mount distributor? As mentioned, often the plug wires get crossed up and thus the timing is off. The FORD N-Tractor distributors all have the timing/firing order set as 1,2,4,3. The #3 and #4 plug wires often get switched/reversed so check those first. You said you replaced the points, pugs, coil, rotor, cap, and plug wires. No mention if condenser was replaced. Okay, did you rebuild the distributor correctly? Did you set the points and timing on it? Front mount timing is set static on your workbench. The offset tang ensures when correctly mounted the timing is set. On the side mount unit, you need a timing-light and will have to remove the inspection cover on the bell housing to view the timing marks. Start with a fuel flow test. Engine OFF and COLD, you will be performing this at and on the carburetor. Download a copy of ’75 Tips for N-Owners’ by Bruce(VA) located in our HOW-TO’s forum. It lists the method to test for fuel flow. If it passes, you next move on to spark testing. If it fails, further problem solving is needed. That may include a complete carb rebuild, a sediment bulb cleaning and replacing the valve stem unit. If the firing order is good, move on to the other problem solving methods as stated. It is highly recommend that you invest in the essential manuals too.
FORD N-SERIES TRACTOR FRONT-MOUNT DISTRIBUTOR FIRING ORDER:
FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: