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Subject: 9N Question (looking for mechanic)

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Greg Moore    Posted 04-26-2022 at 16:52:50 [URL] [DELETE]        [Reply] [Email]  
  • 9N Question (looking for mechanic)
  • Hi Folks, A friend of mine purchased a '39 9N to replace a completely dogged '50 8N. It definitely has some problems - my guess, and it's just a guess, is that it's either carb or governor problems - or maybe both. Is there anyone you might know of in the Denver to Brighton, CO area that works on the N series? It's probably a pretty simple solution for someone who knows what they're doing. I hate to tell her to buy a new carb (the old one is in bad shape I think) if it's the governor. I can change the carb out, I do have the tools and the ability to do that - but the governor would be a different story...Symptoms: Won't rev up, really down on power. Throttle works backwards from the old 8N. Does not idle, choke has to be pulled out to keep it running. It's like the fuel delivery system is hooked up backwards. Thanks for your time!!! Greg

    Jack - Iowa    Posted 05-01-2022 at 07:07:18 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N Question (looking for mechanic)
  • I agree with Tim.

    I have used starter fluid for this job also. I hear WD-40 will also work but have not tried it.


    Bruce(OR)    Posted 04-27-2022 at 18:58:38 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N Question (looking for mechanic)
  • No stupid questions here anymore. I have asked most of them over the years.
    Choke 1/2 out to run is quite possibly a vacuum leak and that should be at the intake manifold where it mounts to the engine. Remove it, take it to a machine shop and get it sanded flat. Remount it with a new gasket and then see what you get BEFORE, BEFORE you play with the poor defenseless carburetor.

    Tim    Posted 04-30-2022 at 19:28:16 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N Question (looking for mechanic)
  • could you spray brake cleaner around the intake manifold (where it mounts to the engine) while the tractor is running to check for vacuum leak? If the tractor speeds up when spraying the cleaner, there is a leak. if the tractor doesn't change speeds, then the intake manifold isn't leaking.

    Check the joint between the carb and the manifold next the same way to see if there is a leak there.

    I think it would be a safe check to rule out something before ripping into it.

    Steve Dabrowski    Posted 04-30-2022 at 16:53:53 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N Question (looking for mechanic)
  • Just be careful that the machine shop does not set it up using the carb flange as a right angle position index point. I had a great manifold on my 8N done by the machine shop and they faced it 90 from the carb flange and when I tried to install it the carb fell too close to the block. The face of the engine block is about a 2 from perpendicular, so beware.

    I had a thin plate made up to insert between the manifold and the block that was cut with a 2 bevel to correct the angle, that and two manifold gaskets fixed the problem.

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