Yesterday's Tractor Co.
Shop Now View Cart
   Allis Chalmers Case Farmall IH Ford 9N,2N,8N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   Traditional YT Forum ViewClassic View   RegisterRegister 
 ProfileProfile    Log inLog in 

Ford 4000 gasoline 1972 running rough


 
Post new topic    
View previous topic :: View next topic  
Author Message
rams2050
New User


Joined: 31 Aug 2014
Posts: 16
Location: Missouri

Report to Moderator

PostPosted: Fri Oct 25, 2019 4:23 pm    Post subject: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote

Hi!

You guys have helped me so many times in the past so I thought I'd come to you again.

My tractor runs rough. Choking improves the rough running but when I throttle down to an idle, it dies. Any ideas on what I might do to fix this?

Thank you in advance!!
 
Back to top
View user's profile
mikewood869
Long Time User


Joined: 26 Feb 2017
Posts: 933


Report to Moderator

PostPosted: Fri Oct 25, 2019 4:56 pm    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote


Is the bottom of the carb wet? The float gets stuck and I have to pull the drain plug on the bottom of the carb and with a wire or something and pock at the float.
 
Back to top
View user's profile
Ultradog MN
Tractor Guru


Joined: 22 Apr 2001
Posts: 24656
Location: Twin Cities

Report to Moderator

PostPosted: Fri Oct 25, 2019 5:05 pm    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote

I gotta ask:
Is it a Holley carb or a replacement?
Is the original fuel system still
intact?
By the way, I still always check my
spark first - even if I'm pretty sure
it's a fuel problem.
 
Back to top
View user's profile
rams2050
New User


Joined: 31 Aug 2014
Posts: 16
Location: Missouri

Report to Moderator

PostPosted: Sat Oct 26, 2019 6:25 am    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote

Thank you both so much! You've given me
some ideas that I can try out.

I don't really know what kind of
carburetor it is but I have never replaced
it and I have had it for 35 years. It just
got all new spark plugs and wires two or
three years ago. It had been running great
until about a week ago so I'm just
grasping at straws here and you have given
me some things to try. Thank you.
 
Back to top
View user's profile
Dean
Tractor Guru


Joined: 29 Jan 1998
Posts: 20254


Report to Moderator

PostPosted: Sat Oct 26, 2019 6:46 am    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote

Always verify that the ignition is spot on before looking to carburetion, even if your experience tells you otherwise.

"Running rough" (missing) is generally (I did not say always) caused by faulty ignition, but it is nearly impossible to diagnose such symptoms in a chat forum.

Is it flooding? Black smoke? If so, look to float level. The OEM Holley carburetor is very sensitive to float adjustment.

Does it stumble only upon tip-in (throttle up)? If so, look to the vacuum operated accelerator pump and the usually defective vacuum advance motor, which affects intake manifold vacuum.

Many folks, herein, do not like the Holley carburetor used on Ford tractors but it was a very good carburetor in it's day, and quite simple as compared to contemporary automotive carburetors. Should you decide to rebuild yours, bite the bullet and buy your overhaul kit from a CNH dealer. Insist upon the expensive genuine CNH kit rather than an aftermarket kit and pay close attention to the float level and float drop adjustments. Be certain to take both tractor SN and carburetor SN with you when you visit your CNH dealer to order your kit (they will NOT have one in stock) and insist upon speaking with an experienced parts person.

Finally, disassemble your carburetor before ordering your kit. Some (many?) Holley carburetors cannot be cost effectively overhauled due to, e.g., corrosion damage. If this is the case with your carburetor, you will need to replace it with a Zenith.

Dean
 
Back to top
View user's profile
rams2050
New User


Joined: 31 Aug 2014
Posts: 16
Location: Missouri

Report to Moderator

PostPosted: Sat Oct 26, 2019 7:16 am    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote


Thank you for all the great information
And please excuse my ignorance but what is 'CNH?' Thanks, again, in advance.
 
Back to top
View user's profile
mikewood869
Long Time User


Joined: 26 Feb 2017
Posts: 933


Report to Moderator

PostPosted: Sat Oct 26, 2019 7:33 am    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote

Case New Holland, brand
 
Back to top
View user's profile
rams2050
New User


Joined: 31 Aug 2014
Posts: 16
Location: Missouri

Report to Moderator

PostPosted: Sat Oct 26, 2019 8:49 am    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote

Thanks, again.
 
Back to top
View user's profile
Deutz Lover
Long Time User


Joined: 21 Aug 2015
Posts: 1106


Report to Moderator

PostPosted: Sun Oct 27, 2019 9:12 pm    Post subject: Re: Ford 4000 gasoline 1972 running rough Reply to specific post Reply with quote

Sometimes the choke or throttle butterfly shaft/or bushing gets worn and allows air in to upset the mixture. If the float and everything else is okay you can temporarily check this by dobbing heavy grease (ear swab)on the both sides of the shaft while it is running to seal the leak if that is what is going on. The tractor is 35 years old.
An alternative is to take a propane torch, turn the propane on and run the unlit head around the carburetor and intake gaskets to see if it affects the idling engine.(raise the idle enough to keep the engine running.) This is a check for gasket leaks, throttle leaks, and warped intake manifolds.
 
Back to top
View user's profile
:   
Post new topic    Yesterday's Tractors Forum Index -> Ford All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  

TRACTOR PARTS TRACTOR MANUALS
Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). We have the parts you need to repair your tractor - the right parts. Our fast shipping, low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

YT Home  |  Forums

Modern View Forum powered by phpBB © 2001, 2005 phpBB Group

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