Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Ford 9N, 2N & 8N Discussion Forum
Order Ford 8N Parts Online

8N not maintaining steady RPMs

Welcome Guest, Log in or Register
Author 
Aaron

05-14-2004 07:47:05




Report to Moderator

End of last summer I purchased my 8N. Other than it being moved a couple of times during the winter it hasn't been used. Yesterday, I changed the oil, cleaned the bowl, cleaned the air filter, and lubed the fittings. After charging the battery and several 'shots' of starting fluid, I was able to get it started. It idles fine. The problem is that it is having problems maintaining steady RPMs while I use it. If the load is steady (such as a steady grade uphill or downhill) everything seems ok. It is when there is a transition or even on level ground, the engine will rev a bit and then back way off, rev a bit then back way off... etc.

Is this a problem with the governor? Will a squirt of WD-40 in the appropriate place help? Or will I need to do something more significant?

Any ideas will be greatly appreciated.

Thanks,
--Aaron

[Log in to Reply]   [No Email]
Rob

05-14-2004 09:09:05




Report to Moderator
 Re: 8N not maintaining steady RPMs in reply to Aaron, 05-14-2004 07:47:05  
You do know that the governor is suppose to vary the engine rpm. The governor is trying to keep the ground speed constant and it does that by changing the engine rpm.
Take a hard look at the linkage for worn ends and slop. That spring mounted on the governor should have no tension and no slop when relaxed. You may have to bend the ends of the spring some to take out a bit of slop from normal wear. Maybe 1/16" or even less. That spring is like 2 1/4" long or so.
Set the length of the linkage to get 2200rpm with the throttle at max. Set the adjustment screw on the carb throttle arm to get 400rpm at idle. Get the slop or tight out of that governor spring when the throttle is at the minimum and see how it works.

[Log in to Reply]  [No Email]
Not quite....Jeb2N

05-14-2004 09:51:42




Report to Moderator
 Re: Re: 8N not maintaining steady RPMs in reply to Rob, 05-14-2004 09:09:05  
Actually, the governor maintains constant engine RPMs based on the throttle setting by varying the throttle butterfly in the carb. If a load bogs the engine down, the governor adjusts the carb to give it more "juice" and get the engine back up to the previous RPM setting. Essentially the gov tries to keep the engine at a constant speed through varying loads.



[Log in to Reply]  [No Email]
Rob

05-14-2004 10:23:43




Report to Moderator
 Re: Re: Re: 8N not maintaining steady RPMs in reply to Not quite....Jeb2N, 05-14-2004 09:51:42  
Right. Result is the engine rpm varies some normally because of the changes in the load. What with the governor trying to get it back to the set rpm.
If the ground speed is constant while the engine rpm is changing some, even on what seems level ground, that would be the governor getting the job done.
Seems to me anyway. It wouldn't be right if the ground speed was changing up and down on level ground. That would be undesirable.

[Log in to Reply]  [No Email]
souNdguy

05-14-2004 21:53:48




Report to Moderator
 Re: Re: Re: Re: 8N not maintaining steady RPMs in reply to Rob, 05-14-2004 10:23:43  
On a direct coupled gear tranny.. ground speed will be in direct proportion to engine rpm. if the engine rpm chaanges.. ground speed changes..

( only Scotty can change the laws of physics.. )

Soundguy



[Log in to Reply]  [No Email]
souNdguy

05-14-2004 07:54:35




Report to Moderator
 Re: 8N not maintaining steady RPMs in reply to Aaron, 05-14-2004 07:47:05  
Good chance it is the governor. WD-40 probably won't help.. unless you've got some heavilly modified external linkage thats rubbing somewhere.. ( and is shouldn't be ).

The governor has its own oil line to it for lube.. since somewhere in the mid to late 40's

Look at t he governor and stand beside the tractor, and move the throttle handle.. observbe what happens.. now manually goos the carb link from the governor.. You should see the gov fighting back. The two springs ont he gov should have to pension or slack.. if there is sided gap on the arms ont he shaft.. time to shim back into specs.. if the gov is simply slow to respond.. probably just flat spots ont he balls, which is VERY common... Rebuild kits area available.

Sometimes there are even grooves int he races the flybass run in.. if so.. you will need to repair/repalce.

Soundguy

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


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. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 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