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Subject: carb

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gary    Posted 07-19-2020 at 10:38:52 [URL] [DELETE]        [Reply] [Email]  
  • carb
  • got the 8n running with 35 lbs oil pressure yea. runs great and then quits. its flooding out. don't know if i want to rebuild or replace. Maybe heavy float or needle and seat not sealing. any suggestions on a replacement?

    Tim Daley(MI)    Posted 07-20-2020 at 05:38:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: carb
  • Like Harold said, check for spark right when it shuts down. When engine cools off perform the fuel flow test. When it floods out, are you getting fuel in the air throat passage where the rubber hose connects too? 35 years or 35 hours experience, rule #1 is to not start replacing parts willy-nilly, thru guessing. Root cause problem solving is the proper procedure for any problem. All major components were designed by Ford to be rebuilt over and over and should be your first choice rather than buying anything made new today. Have you pulled, cleaned, and rebuilt the OEM carb recently? If so, was float set at right height? I suggest to go back to the three basics - spark and fuel but I don't think it is a compression issue so concentrate on the first two.

    Probable NO-GO fuel issue causes are: plugged vent, plugged screens, plugged sediment bulb, dirty gas tank, dirty carb, and more. There are three OEM screens in the fuel system. Two are on the Sediment Bulb Assembly; the 3rd is on the brass elbow inside the carb where the fuel line connects to. SEE PICTURES. Do not shove anything, wires especially, up into the sediment bulb assembly. You have a vertical fine mesh screen on the inlet port inside the tank that you can damage. Best solution is to remove the tank and thoroughly clean. There are several possible causes for no fuel flow, not just the carb.


    The ESSENTIAL MANUALS are your friend. PM is so important to maintain any piece of machinery.


    Tim *PloughNman* Daley(MI)

    gary    Posted 07-20-2020 at 22:17:43 [URL] [DELETE]        [Reply] [Email]  
  • Re: carb
  • going to check ignition switch first, it has failed once before. The tractor just quits, it doesn't start running bad, it just quits. When its running, it just purrs.

    Tim Daley(MI)    Posted 07-21-2020 at 06:56:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: carb
  • You can look at your ignition switch, but I highly doubt it is your root cause problem. "...It has failed once before..." -how did you determine that? I once bought the cheap,aftermarket vinyl-covered wire type ignition switch and it stopped on me. Investigation found the switch wire was rubbing against the toolbox and wore it to bare metal. It shorted everything out. I then purchased a Dennis Carpenter exact-as-original cloth-covered wiring ignition switch and never had that problem again. Now, we told you what to check first. When tractor stops, perform spark test right then. When engine gets cold, perform the fuel flow test. Verify wiring is all correct using the schematics and PICTOGRAMS. You asked for help. We gave the best solutions to try.

    Tim Daley(MI)

    JMOR    Posted 07-19-2020 at 11:12:01 [URL] [DELETE]        [Reply] [No Email]  
  • Re: carb
  • What are you going to replace? the float, the needle/seat? you haven't found the part that needs replacement /adjustment yet!

    gary    Posted 07-19-2020 at 12:11:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: carb
  • tractor has been idle for a couple years waiting for new crank and bearings. completed rebuild and when i started it it ran fine for maybe 5 minutes and quit just like you shut off ignition. When i got it restarted it was obvious it was flooded. shut off fuel and waited an hour with fuel shut off and it started right up and ran about 4 to 5 minutes and did the same thing. I am not assuming anything, but i have been a professional mechanic all my life and it sure sounds like its flooding but it doesn't act like it. By that i mean it doesn't start running rough and then stall, it just quits. I have never had trouble with this unit stalling.

    HCooke    Posted 07-19-2020 at 19:07:00 [URL] [DELETE]        [Reply] [No Email]  
  • Re: carb
  • "ran fine for maybe 5 minutes and quit just like you shut off ignition."

    Immediately check for spark.

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