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Subject: ford 8 n misses

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Jan Grossman    Posted 10-05-2018 at 14:25:31 [URL] [DELETE]        [Reply] [Email]  
  • ford 8 n misses
  • I have ford 8 n I put new plugs, points, coil, plug wires cap and rotor it still misses a little when idle, when rev up to full throttle misses bad what cold be wrong

    Tim Daley(MI)    Posted 10-06-2018 at 07:57:23 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8 n misses
  • 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:

    Tim Daley(MI)

    Jan Grossman    Posted 10-18-2018 at 13:18:49 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8 n misses
  • I ck compression 90 psi or above on each cylinder carb rebuilt. The miss was there before I replaced points plugs and wire and replaced condenser, coil any other ideals
    Thanks Jan

    Den N Ms    Posted 10-05-2018 at 20:03:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8 n misses
  • Check the compression on all 4 cylinders with a good compression gauge,it should have 80lbs or more.It could have a stuck,bent or burnt valve causing your miss.Is the firing order correct? 1,2,4,3 CCW.

    Bruce(OR)    Posted 10-05-2018 at 19:33:50 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8 n misses
  • Did you file a "missing tractor" report?
    Was it broke after you fixed it? Before? Did it change? Got better? Worse?
    If no change, then it was not your problem. Look at the suggestions given. Past parts already replaced with no change don't need to be changed again.

    K.LaRue-VA    Posted 10-05-2018 at 18:57:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8 n misses
  • Timing 1-2-4-3
    Were distributor bushings good? No shaft side-to-side wobble?

    Farmer Dan    Posted 10-05-2018 at 15:25:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: ford 8 n misses
  • Could be timing, could be carburation, could be fuel starvation, etc. Are you getting a good hot spark at all four of the plugs?

    Jan Grossman    Posted 10-05-2018 at 15:39:20 [URL] [DELETE]        [Reply] [Email]  
  • Re: ford 8 n misses
  • If I pull choke out it runs rougher. I cleaned carb several times. The spark looks the same on all 4 plugs.

    Tony C    Posted 10-05-2018 at 20:06:03 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ford 8 n misses
  • Compression? Clean gas? Mis wired high tension cables at the distributor or plugs?
    Firing order is 1243, not the more common 1342.

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