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Subject: Choke plate

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Frank (WNY)    Posted 07-27-2018 at 09:53:02 [URL] [DELETE]        [Reply] [Email]  
  • Choke plate
  • I have a 50 8N front distributor. I disassembled the carburetor to clean and rebuild. When I removed the choke plate, I noticed the hinged relief valve on the plate. According to the service instructions for the M-S carbs, it is normally mounted with the valve up and there should be a spring to hold the valve against the airflow. Mine was mounted with the valve down and against the airflow and is missing the spring. It looks like the only time it makes a difference, is when the choke plate is closed. Is there a replacement spring available, or should I just replace the assembly? The tractor has been running OK without it since I bought it a few years ago. I am cleaning the carb because suddenly a few weeks ago, it wouldn't run without holding the choke out. It happened while I was cutting brush. I have checked for fuel flow and that pours out of the drain plug on the bottom of the carb at a good rate.

    HCooke    Posted 07-27-2018 at 12:31:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: Choke plate
  • I do not have a part number, but I have purchased them in the past. Used to have a Ford - New Holland dealer near - not any more. I would call Just 8Ns. I realize you will spend more in shipping than the part costs. However. the flapper should be on the inside of the carb and held on with the spring.

    Frank (WNY)    Posted 07-27-2018 at 14:11:54 [URL] [DELETE]        [Reply] [Email]  
  • Re: Choke plate
  • Problem solved! I bought the complete rebuild kit and the spring is in it! The P/N for the spring is 9N9560.

    I just hope that cleaning and rebuilding the carb solves the original problem.

    Is there any easy way to check the vacuum from the intake manifold to see if it leaks? I was looking for a procedure but can't find one.

    Dave Smith    Posted 07-27-2018 at 15:24:30 [URL] [DELETE]        [Reply] [Email]  
  • Re: Choke plate
  • Frank, Some of the earlier manifolds had a plug on the intake side.
    Often used to operate a milking machine.
    Actually a vacuum gauge is a better diagnostic tool than a tachometer to show what is
    going on inside of a engine. check the how-to's.
    I have added a vacuum port when I have had the manifold off.
    By drilling a hole in the intake side and threading for a 1/8 inch pipe plug.
    Then you can connect a hose barb to the manifold.
    I have seen 1/8 inch valves with a hose barb included installed.
    I would be awfully leery of drilling the manifold with it on the engine.
    I wouldn't want drilling burs inside the manifold.
    Dave <*)))><

    Frank (WNY)    Posted 07-27-2018 at 19:43:47 [URL] [DELETE]        [Reply] [Email]  
  • Re: Choke plate
  • Thanks! That is a great idea. I remember when I used to work on my car back in the 70's I had a gauge but I lost track of it. Oh well time to get a new one.

    JMOR    Posted 07-27-2018 at 15:03:47 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Choke plate
  • Be cautious. The picture in the M/S manual is wrong. The choke plate needs to be installed as per this corrected picture.

    Frank (WNY)    Posted 07-27-2018 at 19:40:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: Choke plate
  • Thanks. I was just ready to put it back together.

    Frank (WNY)    Posted 07-27-2018 at 13:00:25 [URL] [DELETE]        [Reply] [Email]  
  • Re: Choke plate
  • Thanks for the advice. I will talk to the people at Just 8N's.

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