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Subject: 9N engine goes from idle to high rpm quickly

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Mark    Posted 02-12-2018 at 20:28:33 [URL] [DELETE]        [Reply] [Email]  
  • 9N engine goes from idle to high rpm quickly
  • My 9N which I purchased a few days ago starts, but goes from idle to full throttle in just a small amount of throttle movement. Likes to start with the throttle fully closed or just barely cracked. We put seafoam in the gas and ran it for awhile, but that didn't help. It hasn't been used much which is why the guy sold it as he was tired of working on it and he hardly ever started it. My buddy and I are planning on pulling the carburetor and governor and giving them a good cleaning. Open to any advice from folks who have any suggestions/advice.

    I just finished reading "75 tips for N owners" and found it a great resource. I have hundreds of hours on a 9N and 8N, but that was 43 years ago and dad did most all the maintenance. I'm looking forward to going through this tractor with my friend who likes to work on old tractors.

    K.LaRue-VA    Posted 02-13-2018 at 15:39:03 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N engine goes from idle to high rpm quickly
  • It may help to watch carefully how all of the throttle and governor linkage moves when the throttle lever is moved. The problem may become instantly obvious. If that fails to reveal the problem, there are photos in the manuals Tim listed that will show how everything is supposed to be hooked up. Many things could be bent, broken, hung-up, or fouled-up in the throttle/governor linkage.

    Tim Daley(MI)    Posted 02-13-2018 at 07:30:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 9N engine goes from idle to high rpm quickly
  • Hi Mark-
    Welcome to the wonderful world of vintage Ford N-Series tractors. You will find a ton of useful information here in our other forums. Our HOW-TO's has much to offer as well as the MANUALS and HISTORY forums. The archives can be valuable learning tool as well. Most questions and issues have been discussed before so you may find your answers there. Just plug in a keyword or words and read all the old posts that have been archived. It requires some patience to do as you will have to scroll through and read each one ad they are not saved in chronological order, unfortunately. My advice is to first get yourself copies or originals of the essential manuals. The I&T F-04 Manual; the '39-'53 MPC (Master Parts Catalog); the 9N Owners/Operator manual; and the 9N Service Manual are important to keep handy. You need to understand about the front mount distributor, 6-volt/positive ground electrical system, the hydraulic system with draft control, and the 3-seed transmission. You don't say if your 9N is 6-volt or 12-volt, but in our HOW-TO's, under subcategory ELECTRICAL, scroll down to WIRING PICTOGRAMS by JMOR and download a copy for your shop library/coffee table. He has put together a very good instructional document on how to correctly wire these old N's whether 6-volt or 12-volt. Be aware hat may of these N's have been 'converted' to 12-volts and many are done correctly. In my opinion, adding a snake-oil product like Sea Foam isn't doing anything really and is the same as adding charcoal lighter fluid -same main ingredient -mineral spirits. Mineral Spirits will loosen up gunk and clean good, but you would have been better off to just drain all the fluids and put fresh in before staring it since you say the PO (Previous Owner) didn't use the tractor much. I'd, removing the carburetor, rebuild it, as well as doing a tune-up by removing the distributor and rebuilding it. I also would have checked the hydraulic fluid before starting it up to see if the oil is contaminated with water. It will be a murky brown or off-whitish color if so. In that case do not operate the lift as the pump may need to be serviced. I'd hold off on the governor rebuild until later. If you are going to remove the carb, distributor, and/or governor, you should rebuild them not just 'clean' them. The electrical system is very important as well. Start with the battery. Whether 6-volt or 12-volt, you must have a good, reliable brand of battery like DEKA, INTERSTATE, or EXIDE. Avoid bargain-house brands as they have very poor lifespans and can be bad out of the box. The battery must be fully charged and able to sustain the charge under load in order to crank over the engine. Your trusty, local starter/alternator shop can bench test it, usually for free. Wiring is important too. The spark plugs will be replaced when you do a tune-up. The original Ford Tractor Spark Plug was spec'd as the 14 mm Champion H-10. they are still made and sold today but since then, Champion released a hotter plug, the H-12, also listed as the '512' plug nowadays. Many N-Owners also use the AUTO-LITE 437 plug, sold sometimes as the 216 plug today. ALL of these plug work well. I use the H-12 or the 437 plugs nowadays and never had any issues with any of them. One last thing for now is to know your Nís capabilities and how to safely maintain and operate it.


    Tim Daley(MI)

    Mark    Posted 02-13-2018 at 15:09:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: 9N engine goes from idle to high rpm quickly
  • Thanks Tim for all the great advice. Iím going to print out your response and follow your advice best I can. I ordered a couple manuals and will get a set like you suggest. Feels good to be around an N again.

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