(800) 853-2651
SHOP NOW

8N Idle speed

If all is well, a 9/2/8N engine should idle at 400 RPM or less but most will not do so after 60 or 70 years of wear in the throttle shaft bore.

Air leaking between the throttle shaft and the bore usually renders the idle air screw ineffective.

Dean
 
hjguy........what Dean sez.......to check yer throttle bore, spray some WD-40 on the shaft while idleing. Iff'n leaking, will change the idle. Also learn how to adjust yer idle. Set yer down-pointing mainjet to 2-turns and LEAVITT!!! Adjust yer side-pointing idlemix fer FASTEST idle, NOT SMOOTHEST idle. Understand the difference??? I once got my eazy starting 6-volt 8N to idle at 350-rpms onna transistorized tachometer after a carbie rebuild.
...but... as a general rule, ennythang under 500-rpms is good.......HTH, carbie Dell
 
I assume you have tried the idle adjustment screw.
If you have backed that out, will it idle down if you
push on the head of the screw with your finger?
 
(quoted from post at 12:17:17 08/22/17)
(quoted from post at 10:50:21 08/22/17)
pushing on idle screw lowers idle, but it springs back fast
Click to expand...
hen you have a linkage problem, adjust it.
Click to expand...

FO_4 says to adjust the preload on the governor spring. Good book to have.
 
(quoted from post at 18:05:50 08/25/17)
the gov spring is as required

more suggestions?
Click to expand...
Unhook rod going to the carb and move the throttle towards idle, if it will idle down you still have gov spring or linkage problem
 
(quoted from post at 21:38:35 08/25/17)
(quoted from post at 18:05:50 08/25/17)
the gov spring is as required

more suggestions?
Click to expand...
Unhook rod going to the carb and move the throttle towards idle, if it will idle down you still have gov spring or linkage problem
Click to expand...
We're on the same page Mr. Geiger. That's why I asked him to
push on the idle speed adjustment screw, which slowed it down.
Governor out of adjustment or worn.
There's the old farmer's fix of bending the governor to carb
linkage to make it shorter too. I see a lot of bent ones.
Mine are all straight though.
 
(quoted from post at 19:54:36 08/25/17)
(quoted from post at 21:38:35 08/25/17)
(quoted from post at 18:05:50 08/25/17)
the gov spring is as required

more suggestions?
Click to expand...
Unhook rod going to the carb and move the throttle towards idle, if it will idle down you still have gov spring or linkage problem
Click to expand...
We're on the same page Mr. Geiger. That's why I asked him to
push on the idle speed adjustment screw, which slowed it down.
Governor out of adjustment or worn.
There's the old farmer's fix of bending the governor to carb
linkage to make it shorter too. I see a lot of bent ones.
Mine are all straight though.
Click to expand...

Well one of my 8n is doing the same thing, but since I rarely ever run at an idle I do not worry about it. Maybe I will take the time and play with it and see what I can do. Canned peaches today so got that out of the way. Nothing better to can than a tree ripened peach.
 
You must log in or register to reply here.

Similar threads

D
1947 Ford 2N searching for steady rpm at Idle?
Replies
8
Views
214
Dwd14329
D
M
8N Hydraulics
Replies
1
Views
151
Tim PloughNman Daley RIP
T
DaveH (NY)
Sherman step up
Replies
5
Views
311
DaveH (NY)
DaveH (NY)
T
Re: Hood & Jar Precleaner Hardware Questions for Restora
Replies
0
Views
239
Tim PloughNman Daley RIP
T
C
  • Question
1950 8N overheating in hello oil pressure
Replies
7
Views
428
Eman85
E
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top