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Ford 9N, 2N & 8N Discussion Forum
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2N Setting the idle to 400

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6N's Short

05-15-2005 08:47:21




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I've been starting my adjustments on my carb rebuild and was pretty pleased to hear the RPM's drop when I started to back out the throttle screw per Rob's instructions BUT I never did get it so slow that I felt I was "up against the stall" so that I could start adjusting the idle needle as instructed. I have that throttle screw almost all the way out and the RPM's are lower but I am nowhere near getting a slow enough speed.
I looked at the governer linkage and it was really dirty with a lot of greasy chaff interfering with the linkage so I cleaned all that out and was able to lower the RPM's a little more. Still not so slow that it might stall. Hey Rob, and others, what am I doing wrong this time? She started great now that I know how. Just need to overcome this last bit of trouble!

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Dell (WA)

05-15-2005 11:49:26




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 Re: 2N Setting the idle to 400 in reply to 6N's Short, 05-15-2005 08:47:21  
Shorty..... ...iff'n you can't gitt the down-pointing mainjet adjusted per Robs instructions, (and you probably won't without a load, the stall is very shallow) DO IT MY WAY.

Both Ford and M/S say to adjust BOTH the side-point idle mixture adjust and the down-pointing mainjet to 1-turn. I adjust the down-pointing mainjet to 1-1/2 turn and LEAVITT!!!

I then adjust the side pointing idle mixture for maximum rpms, NOT SMOOTHEST IDLE; max rpms at idle. Understand? Then adjust the behind the carb throttle idle speed for slowest/slower idle rpms. Now re-adjust the side-pointing idle mixture for max rpms again. I do this song and dance 3-rounds, and my idle speed usually ends up below 450rpms.

Remember the side-pointing idlemixture is BASSKWARDS; out for lean and IN for INRICH. My side-point idle mixture usually ends up about 3/8 turn. And iff'n you can't gittchur idle speed below 500rpms, disconnect yer throttle-to-governor rod. It won't hurt ennythang disconnected while you adjust yer idlemixture ..... ..respectfully, Dell

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Bob

05-15-2005 09:45:43




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 Re: 2N Setting the idle to 400 in reply to 6N's Short, 05-15-2005 08:47:21  
The 400 RPM idle isn't much good for anything except BRAGGING RIGHTS.

If it idles down, and runs well, without missing or sputting, that alone is more than a lot of "N" owners accomplish.

Myself, I think "idle quality" is more important than the magic 400 RPM number, and if the darn thing idles WELL at 500 or 600 RPM, DON'T WORRY, BE HAPPY!



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jwm

05-15-2005 17:39:46




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 Re: 2N Setting the idle to 400 in reply to Bob, 05-15-2005 09:45:43  
Now, Bob; you don"t think Dell likes to brag do you? James



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Rob

05-15-2005 09:00:55




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 Re: 2N Setting the idle to 400 in reply to 6N's Short, 05-15-2005 08:47:21  
Keep turning until it does stall.

Then back in 1/4-turn or 1/8th. Then the other screw and do it again until if you *know* you can"t turn either screw because you tried and it stalled.

It"s not about feeling or guessing. Prove it.



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6N's Short

05-15-2005 09:07:31




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 Re: 2N Setting the idle to 400 in reply to Rob, 05-15-2005 09:00:55  
What if you turn it until the screw falls out and it still doesn't stall? Looking at the throttle arm I am pretty sure this is the what is going to happen. What would be the likely situation then?



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Rob

05-15-2005 09:16:48




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 Re: 2N Setting the idle to 400 in reply to 6N's Short, 05-15-2005 09:07:31  
Probably remove the carb and clean the passages and ports with special attention to the tiny port in the throttle throat and the smaller port right next to it. Those two ports are all about idle and the passage goes from those ports in the throat to the idle oriface/jet. If they are not open the idle adjust don"t do much and never goes low.
The throttle plate only closes so far so when you back out the throttle screw so far, backing it out more has no effect. The two tiny ports are one on one side of the closed throttle plate and the other on the other side. There is a pipe plug in the throat to be removed to get straight into the tiny ports on the other side of the throat. I use welder"s tip cleaners to make the reach and root out the crud. The smallest tip cleaner and then like two sizes bigger to ream it. You come from both ends with the cleaners.
You dap some solvent (qtip) in the oriface and see if it flows out the tiny ports. If it doesn"t, you aren"t done.

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6N's Short

05-15-2005 09:24:24




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 Re: 2N Setting the idle to 400 in reply to Rob, 05-15-2005 09:16:48  
Man, I thought I had all those little holes cleaned out pretty good. I did it twice and checked them all like you said now and before. I was thinking maybe there was more something wrong with the linkages or perhaps I have something assembled wrong. The throttle contol on the dash of the tractor will not go all the way down to the idle position without springing back about an inch. I'm going to look at the throttle arm when it cools down and see if it looks like it is positioned correctly. I WILL look at the ports again but I cleaned it once initially and then did it again to be sure after Dell sent me the carb rebuild link. I am very puzzled. Seems to me it idled before I took the carb off.

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Rob

05-15-2005 10:36:13




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 Re: 2N Setting the idle to 400 in reply to 6N's Short, 05-15-2005 09:24:24  
Sounds like you got the linkages too short or the governor spring tight. The linkages just go on there with everything at rest. They don"t adjust to push or pull anything when at rest.
The governor spring is no slack and no preload. Exactly.



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6N's Short

05-15-2005 13:17:24




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 Re: 2N Setting the idle to 400 in reply to Rob, 05-15-2005 10:36:13  
I don't exactly know exactly what no slack and no preload means but the governor spring does not appear to be tight and I will say that I made no adjustments to any linkages or to the governor. I was over my head when I took the carb off so I wasn't looking to cause any problems. I let her cool off and I am going out to look at all the linkages and see what is up. The throttle screw turns and has about an eighth left on the threads but turning it no longer affects rpms. Seems like it would be significant that the throttle control on the dash doesn't operate thru its entire range. First I will clean all that loose chaff off and then I will see what is going on. I will also give Dell's tip a try and see if I have any better luck. I'll put a fresh post up when I am done so you can see where I am at. I refuse to throw in the towel on this. I made it this far and I will sort this out!

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Bob

05-15-2005 14:13:55




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 Re: 2N Setting the idle to 400 in reply to 6N's Short, 05-15-2005 13:17:24  
Unfortunately, the throttle on these old "N"'s operates in a manner far from linear, and likely NOT through its entire range!



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6N's Short

05-15-2005 17:38:06




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 Re: 2N Setting the idle to 400 in reply to Bob, 05-15-2005 14:13:55  
Thanks Bob, I won't worry about that then. Well another day buggered up on me, you wouldn't think it would happen on a Sunday but with two kids and being self employed there is no such thing as a guarantee that a day will work out as planned. Plus my very good friend and owner of one of my hayfields just called an informed me that his wife passed last night. I guess I will just have to work thru this as time permits. Thanks all, I will post as I progress!

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