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Subject: Throttle Quadrant Plate

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Travis Webb    Posted 05-06-2024 at 10:31:50 [URL] [DELETE]        [Reply] [Email]  
  • Throttle Quadrant Plate
  • Some of you may be familiar with the old adage of classic trucks, where you don't clean the caked on grease/oil because that is what's plugging the leaks, right? Well, case in point I think...I put some WD-40 on some of the hinge components of my 8N, including the throttle lever. It operates much smoother against the quadrant plate now, but I think I made it too loose... When I move the throttle lever up to about 1/2-3/4 range, the engine will rev up, but when I let go of the lever, it 'snaps' back down to idle; doesn't hold at desired throttle position. Is my quadrant plate too worn out to hold the lever, or did I fix it "too good" with the lubrication?

    JMOR    Posted 05-09-2024 at 11:03:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Throttle Quadrant Plate
  • I 'farmerized' mine with a spot of arc weld on each bump.

    Tom Wenrich    Posted 05-06-2024 at 18:16:31 [URL] [DELETE]        [Reply] [Email]  
  • Re: Throttle Quadrant Plate
  • If the tension spring is missing in the throttle linkage the throttle lever will not hold position.

    Ed Gooding (VA)    Posted 05-06-2024 at 17:38:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: Throttle Quadrant Plate
  • Travis, here is what a worn throttle plate looks like next to a new one:

    How does yours look in comparison?

    Travis Webb    Posted 05-06-2024 at 19:57:39 [URL] [DELETE]        [Reply] [Email]  
  • Re: Throttle Quadrant Plate
  • Mine definitely looks like the worn one; hopefully these picture links work. The throttle lever used to stick, was pretty stiff, and after the WD, it’s super slick now and doesn’t hold, as mentioned.

    Ed Gooding (VA)    Posted 05-07-2024 at 04:30:19 [URL] [DELETE]        [Reply] [Email]  
  • Re: Throttle Quadrant Plate
  • The first thing I would do, assuming you don't want to replace the plate, is remove the lubrication from it and see if that helps. If not, follow the throttle rod down behind the air cleaner (may need to remove the air cleaner to get to it) and you will see that it is held by a pinch bolt that connects it to the carb linkage. You can loosen that pinch bolt and see if you can push the throttle rod down a little more to provide more friction against the throttle plate.

    Good luck with it.........Ed

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