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8n Throttle Plate repair

S

ssgofish

New User
Howdy all. It's been quite a while since I looked at this board, but now I have a few questions please. I have a '52 Ford 8N and I just finished the good old 8n throttle plate repair including new ball. (Thanx Bruce Haynes for your instructions in 8n Newsletter.) During reassembly I noticed that the throttle rod and bottom bracket seem to have some play in them. I would say about 20-25 degrees of slop total. Is this normal? The 1/4" bolt is in the notch in the throttle rod. I did not change it. I ask because when I tried out the tractor upon completion it twice dropped almost died but I was able to choke it and keep it running. (It runs lean so I have part choke on it). That's to be fixed later. It only drops off like it's going to die when going up hill, so a slight load. I did not touch the governer compensating spring.
My other question is about the throttle spring attached to the bottom plate. It is there, but doesn't seem to do much. It is under slight tension at no to low throttle and actually does nothing as throttle is increased.
Any ideas?
 
You shouldn't have any slop in the bracket. Is it worn?

The tension on the spring on the rod is adjustable. It's purpose is to maintain downward pressure on the rod to make firm contact w/ the plate. As you advance the throttle, you should hear a click every time the ball bearing in the rod passes a groove in the throttle plate.
75 Tips
 
The spring is adjusted for max downward pressure, as it was when I removed the rod. It does click into place. Does the 1/4" bolt act as a clamp? Perhaps I didn't tighten it enough. Also, what is purpose of throttle spring? It seems there is only tension at idle and no tension as throttle is opened up.
One other thing, if I try to run wot, fast as i can, the throttle will be kicked back to about 1/2. I think governor linkage is doing this, but not certain.
 
Yes, the throttle spring is attached at both ends. It looks fine, but it only has slight tension when the throttle is at idle or very low speed. As throttle is increased the spring actually relaxes and does nothing, no tension.
 
I tightened the 1/4" bolt on throttle bracket and the "slop" is gone. My bad. I just didn't tighten it enough I guess. Now, let's address the throttle spring. Take a look at the 2 pix attached. One pic is shown with throttle at idle, very little tension on spring. The next pic shows spring at WOT. Notice the spring is completely relaxed & is even being pushed towards itself. Is this normal? Also, notice that right end of spring is attached at top of bracket on bell housing. The ford shop manual, Fig. FO58, shows it attached at bottom of same bracket. There is no place to attach spring at bottom on my bracket. Is it top or bottom?
Thanx.

cvphoto26325.jpg


cvphoto26326.jpg
 
Hi folks. First off, thank you for helping me on this. I am happy to say I found the big issue & fixed it. Works now better than ever. I tightened the 1/4" bolt & the slop disappeared. Also, as I said in previous replies, the throttle spring did nothing on my 8N. Didn't seem right that Ford would install a do-nuthin' spring, so I looked at the Ford manual & saw the spring connected at the bottom of the bracket bolted to the bell housing. My spring connects at the top of the same bracket. I flipped the bracket over so the spring connects at bottom. Now there is always tension on the spring & throttle stays put. All working fine. Well, I still have a bent govener linkage rod, still running lean, still has a miss under load. I Luv My 8N.
Thanks again all.

cvphoto26337.jpg
 
Sometimes the part it attaches to is bent. Or you could have the wrong spring. There are 2 springs for n tractors that are similar.
 
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