TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

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

Discussion Forum

640 Carburetor Problems

Welcome Guest, Log in or Register

Author

San Antonio 640

05-26-2001 21:10:30

Report to Moderator

I got in a hurry the other day and forgot to turn off the gas on my Ford 640. Two nights later, I *finally* remembered, and turned it off. The next morning the tractor would not start and there was gas dripping from the hose going to the air cleaner tank. I pulled off the carburetor, cleaned it out, and made sure the float was working properly. The tractor ran for about 45 seconds after I put the carb back on, then it died and gas started dripping again (from where the carb attaches to the air cleaner hose). I'm pretty sure the floats are good, and adjusted right. If they are right, any ideas what could be causing the center "pot" of the carb to fill up with gas? ...And is this because I left the gas on, or is it just a weird coincidence?

[Log in to Reply] [No Email]

9N'er

05-27-2001 05:33:12

Report to Moderator

Re: 640 Carburetor Problems in reply to San Antonio 640, 05-26-2001 21:10:30

sounds like debris drifted down and settled into some place as the gas was left on. a thorough carb blowout, and cleaning may fix it and, let the gas run through the fuel line for a few seconds as well when you remove the carb. The smallest piece of debris can shut down that tractor easy enough.

[Log in to Reply] [No Email]

senyah

05-27-2001 05:08:05

Report to Moderator

Re: 640 Carburetor Problems in reply to San Antonio 640, 05-26-2001 21:10:30

If your carb has not been leaking before it probably did not start leaking just because you left the gas on. There may be a piece of trash in the needle and seat that made its way into the carb while the gas was left on. While cleaning out the needle and seat you can also chack the float setting. A small piece of trash will affect the carb in the same way as a leaking faucet will fill up a sink.
senyah

[Log in to Reply] [No Email]

You nailed it on the head!

05-28-2001 08:04:49

Report to Moderator

Re: Re: 640 Carburetor Problems in reply to senyah, 05-27-2001 05:08:05

Thanks (to a few of you guys) for the advice. Turns out that when I blew out the carb, there were VERY SMALL red paint chips that flew out of some of the valves. I put the carb back together and now she runs fine. Thanks!

[Log in to Reply] [No Email]

Tyler (MD)

05-27-2001 03:45:06

Report to Moderator

Re: 640 Carburetor Problems in reply to San Antonio 640, 05-26-2001 21:10:30

2 main reasons why the carb bowl fills up and overflows is a bad needle and seat or a bad float and float height.

On Dad's 640, I've tryed used different needle valve and seats for the carb and have always had some seepage problems. So you may start there by replacing the needle and seat. Turning off the gas when you're through is a good idea. You say you're float height is set properly? On his TSX-580 MS carb, float height is 1/4" from the nearest part of the float to the gasket. Check to make sure your float isn't leaking. Make sure the float is working. When you put the 2 halves back together, you can turn the carb over and listen. The float should be moving up and down.

Tyman

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

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