(800) 853-2651
SHOP NOW

F-20 opinions please

A

Anonymous-0

Well-known Member
I have a 1939 F-20. I can get it to fire if I put some gasoline in the cylinders but it doesn't seem to want to pick up fuel from the carb. I have removed the priming cup tubes in the cylinder head and put plugs in their place. Replaced plugs, wires, and bought a rebuilt mag. I had the fuel tank cleaned out, cleaned out the fuel lines, replaced the sediment bowl assembly, and had the carburetor rebuilt. The carburetor idle screw is set at 1 1/2 turns, the load screw is at 1 3/4 turns. Turned the load screw to 2 and then 2 1/2 turns and it didn't seem to help. When I choke the carb and crank it over I eventually get a stream of gasoline out of the elbow. If I take it off of choke the stream quits. I am not thrilled about the stream of fuel but I have seen other Farmall carburetors do the same thing. I have the distillate manifold on the tractor. Is there a possibility my manifold could have an internal crack possibly to the exhaust side? If I have someone crank the tractor I can feel a suction on the carburetor. If I remove the plugs they are dry. Just curious what everyone opinions are? Thanks.
 
Seems like you have most the bases covered but don't get to frustrated, we'll get her going. First, do you have good compression? Have you adjusted your valves? If those things are good then you might have a mouse nest built inside the manifold blocking the flow of gas to the engine. I've also had manifolds that were cracked (intake portion) on the backside. Have you pull started your F-20?? Many times while diagnosing an engine problem, I was unable to crank start the engine but was able to get it going by pull starting it.
 
I haven't pull started it. The right tire is completely junk. I was hoping to see what shape the engine is in before buying new rubber. I have not double checked the valves yet. They feel o.k. though. I know the book says to set them warm. What is an acceptable clearance cold? I have not checked compression but can "feel" it when cranking. What is the range for compression? I am not really sure if I have an adapter either. As far as patience, I figure it took years for this tractor to get in a non running condition so I don't expect magic overnight.
 
I just wanted to make sure you were able to feel compression while cranking. I set my valves cold at .10 or .12 but that's just what I do. Try pull starting in fourth gear and see what happens. Just be sure you are being pulled slow enough for the impulse to click.
 
Sprout, With all respect, do you mean 0.010-0.012
The engine speed on pulling should be about what ever the throttle is set at, and never more than the max speed of the tractor in that gear. The impulse coupling is only effective at slow cranking speeds, but not necessary for it to run pulling it.
 
I believe you have made a good effort. If you have covered the carb intake, with your hand, it should suck so hard it makes you pull your hand off the intake quickly. You may be able to see (muffler off) down in the manifold, It does not take much of a crack to be un-startable. If in doubt, take the manifold off, lay it on its back with the ports facing up, plug up the exhaust port with a rubber ball, and fill the exhaust ports with water. If it comes out the intake, there is the problem.
 
What is your opinions on the intake/exhaust manifold being the original Distilate manifold. Is there an advantage to converting it to the gasoline manifold?
 
You must log in or register to reply here.

Similar threads

L
504 Farmall starting issues
Replies
7
Views
346
BarnyardEngineering
BarnyardEngineering
W
Farmall A hard starting - fueling issue
Replies
14
Views
625
C.Amick
C
B
Unusual symptoms, needle valve restriction?
Replies
14
Views
1K
BarnyardEngineering
BarnyardEngineering
O
IH 354 carb issue
Replies
12
Views
545
used red MN
U
J
Farmall H - Only runs on 3/4 choke
2
Replies
21
Views
2K
JMFarmallH
J
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