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Subject: New 8n owner. Will not start

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Timothy Little    Posted 04-09-2019 at 16:36:30 [URL] [DELETE]        [Reply] [Email]  
  • New 8n owner. Will not start
  • I recently purchased a 8n and I really donít much about it. I have replaced everything electrical new plugs, wires, etc. I have strong spark and fuel to the carb and it will not start. I have tried card cleaner, just to see if it would bust over, nothing. Looking for the 8n wizard to help me out and maybe give out a few tips. All help is appreciated.

    Kimberly    Posted 04-10-2019 at 19:48:23 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • Better help will come with more information about your tractor. Three things needed; fuel, air, spark. The way I test for spark is to pull the plug(s) out. I then put the ignition wire on the plug and test for spark; the reason is that I want to see what the spark looks like at the plug gap; fouled plugs can cause the spark to short out and not jump the gap. With the plug out and testing with the plug, I can see how the spark is at the gap. That is important. You said new plugs but I still would want to see the spark at the gap.

    With these tractors you want non-resistor plugs and you want to use solid copper ignition wires; no resister wires. You want the hottest spark you can get and resistor plugs and wires will reduce that spark.

    Some on here have stated to test compression; best way is to use a compression checker; you can borrow them (with a deposit) at parts shops; Auto Zone, Advance Auto, etc. Take the plugs out, spin it over looking at the compression tester.

    You could remove the carb and just spray starter fluid into the intake manifold, the nozzle on the starter fluid is going to atomise the fluid. Could be something about the carb that still isn't letting fuel reach the cylinder.

    PatrickB    Posted 04-10-2019 at 14:55:10 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • So you took the plug out of the bottom of the carb and have full flow?

    Timothy Little    Posted 04-10-2019 at 18:49:23 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • Took the plug out the bottom of the carb and I do have good flow

    Bruce(OR)    Posted 04-10-2019 at 12:25:13 [URL] [DELETE]        [Reply] [No Email]  
  • Re: New 8n owner. Will not start
  • Ether is a better starting agent than carb cleaner. By now the plug are flooded.
    Pull them out and while they are out, pull and ground the coil wire and put your thumb tightly over the plug holes while cranking. You should have enough pressure to push your thumb off the holes. Dry the plugs, reinstall and shoot it with ether.

    Lynn Patrick    Posted 04-10-2019 at 08:16:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • Did you have the distributor out? If so, are you sure you are timing it w/the right timing marks, & not the ones 180* off? (BTDT!)

    Timothy Little    Posted 04-10-2019 at 12:50:59 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • Itís 6v system and everything electrical, I replaced. I have adjusted timing. Iím just not sure what Iíve missed other than compression

    Tim Daley(MI)    Posted 04-11-2019 at 05:40:16 [URL] [DELETE]        [Reply] [No Email]  
  • Re: New 8n owner. Will not start
  • Tim-
    A good rule to keep in mind is don't just start replacing parts without first performing a true root cause problem solving method to determine if the part is defective or not. Start with the electrical system first with the battery. It must sustain a full charge under load to be effective. That doesn't mean simply connecting a battery charger to it. It needs to meet specific gravity and your local starter shop and/or auto parts store can test it properly. Next is to verify all the wiring, the generator, the VR, the distributor are all correct. You still need to tell us if it is an early 8N with a front mount distributor or a later model with the angle (side) mount unit. Front mount timing is set on your workbench or kitchen table by adjusting the points according to setting procedure outlined in the Operator's Manual and I&T FO-4 Manual. Side mount timing is also spelled out in the manuals as well, but procedure is different. The fuel system is next. How did you 'clean carb'? Did you remove it, disassemble it, and rebuild it? How did you 'adjust timing'? If it has the front mount distributor, is the OEM Ballast Resistor in the circuit? Firing order is 1, 2, 4, 3





    FIRING ORDER, 1,2,4,3 CCW:

    Tim Daley(MI)

    Timothy Little    Posted 04-10-2019 at 12:27:40 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • Itís 6v system and everything electrical, I replaced. I have adjusted timing. Iím just not sure what Iíve missed other than compression

    Larry Holbrook    Posted 04-11-2019 at 05:13:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • Is it side mount or front mount distributor? The front mount is kind of tricky to get new points in. Have to take the distributor off put points in just right then put it back on. Spark has to be at the right time.

    Tim Daley(MI)    Posted 04-10-2019 at 04:23:35 [URL] [DELETE]        [Reply] [No Email]  
  • Re: New 8n owner. Will not start
  • Welcome aboard, Tim! Weíll need more information in order to help you. Was the tractor running before you started replacing parts? I suspect you probably have electrical issues, not a fuel or compression issue. Does it have a front mount distributor or the later angle mount style? Is it OEM 6V/POS GRN or a 12V switch over job? A 6V system will have a generator on the RH side of engine with the fan belt attached. It also will have a voltage regulator mounted on the RH dash, on back side of panel. The starter motor will have a solenoid mounted on the barrel. Does it have a 3-speed transmission or a 4-speed? On the RH side of the seat, is there a little lever that moves straight up or down 90į? We have a ton of self-help info here in our HOW-TOís forum plus a lot of scans of the original manuals in MANUALS. Go to ELECTRICAL category and scroll down to WIRING PICTOGRAMS BY JMOR and download copy for yourself. Also download copy of 75 Tips for N-Owners by Bruce(VA). The ARCHIVES also contain years of posts with most all questions having been asked before so feel free to peruse those helpful tools. It is also highly advised that you invest in the essential manuals as well if you donít already own a set. The manuals are a very important part of owning a Ford tractor as they contain safety, operating, and maintenance procedures. The 8N Operatorís Manual, the I&T FO-4 manual, and the 39-53 Master Parts Catalog, are the three major ones to have. We have some in our forum but the only 8N MPC is a í49 version so if you have a later side mount unit you will need a later copy. The I&T FO_4 manual is an older version as well Ėthe newer ones - post 2000 Ėhave much more info. We have a copy of the 8N Dealer Service Manual for Mechanics Ėthe lime green one on our SUPPORT page Ėand many of us shop for parts at Dennis Carpenter or JUST8Ns as well. Not all parts are created equal Ėit matters where you buy from. Start here:


    Tim Daley(MI)

    steveVa    Posted 04-09-2019 at 19:51:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: New 8n owner. Will not start
  • Check your wires firing order.
    Is gas new or old?
    Are plugs getting wet?
    Is there water in the gas?
    Did you clean carb??
    Jets could be plugged.
    Does your choke work?
    Squirt a little fresh gas into carb and see if it pops.
    Are you getting any pops at all? if not carb is plugged or float needle is stuck.
    Did you pull plug in bottom of carb to see if gas flows thru??

    Timothy Little    Posted 04-09-2019 at 19:59:38 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • I cleaned carb, fresh fuel, checked firing order, getting fuel to carb, put fuel in cylinders, no pops of any sort. Only thing I havenít done is a compression test. I put a new head gasket on and the piston and cylinders were in great shape.

    dexterdraco    Posted 04-09-2019 at 19:09:47 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • are you getting air? is your air cleaner or line to it plugged?

    Timothy Little    Posted 04-09-2019 at 19:54:20 [URL] [DELETE]        [Reply] [Email]  
  • Re: New 8n owner. Will not start
  • I took the breather out of the equation. I tried had choking. I even put a little fuel in the cylinder and still nothing

    R geiger    Posted 04-09-2019 at 20:27:46 [URL] [DELETE]        [Reply] [No Email]  
  • Re: New 8n owner. Will not start
  • Did you ever have it running? before I wasted much more time I would do a compression check, both wet and dry.

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