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

Harry Ferguson Tractors Discussion Forum
:

Hard starting TO-20

Welcome Guest, Log in or Register
Author 
Jerry Cent. Mi.

07-23-2006 15:17:16




Report to Moderator

My TO-20 has always started good up to the last few years. It is difficut to start the first time of the day but restarts easily. I suspect that the compression is the problem as it is down to approx. 60 lbs. It runs good after its started and uses very little oil. It hasn't been appart in 30 years or better. What should a good compession be to start good?




[Log in to Reply]   [No Email]
Jerry/MT

07-24-2006 13:38:48




Report to Moderator
 Re: Hard starting TO-20 in reply to Jerry Cent. Mi., 07-23-2006 15:17:16  
You need three things to make an engine in reasonably good meachnical condition start; the proper fuel air ratio, a fat, bluish, spark that ocurrs at the right time.
Make sure that you have a good spark. You can easily test it by pulling the center high tension lead from the distributor cap, holding it near a good ground, turning on the key and trying a start. If you get a fat, bluish, spark the primary part of the ignition circuit and the secondary part of the coil are OK. Check your initial timing with a timing light (if you have one or come back and I'll tell you how to do with out a timing light).If the timing is right and the ignition is right (fat, bluish, spark) then suspect fuel system/carburetor.
You say your compression is only 60 psi. Did you run the compression test on a warm engine, with no plugs installed, with the throttle wide open, and no choke, and preferably the aircleaner disconected from the carb? If you didn't you numbers might be erroneous. As george stated, you should run a wet and a dry compression check, wet being after squirting a bunch of motor oil in the tested cyclinder. This will tell you whaether you have a ring or valve problem.

[Log in to Reply]  [No Email]
gshadel

07-24-2006 08:06:46




Report to Moderator
 Re: Hard starting TO-20 in reply to Jerry Cent. Mi., 07-23-2006 15:17:16  
Jerry,
60 psi is a bit on the low side, but your TO should still start pretty good if all else is in good order. Did you do a dry compression, then do it again with a squirt of oil in the cylinder?

Your symptoms sound like a leaky gas shut-off to me. When your up-flow carb. bowl gets overfilled with gas, your TO just won't start worth a darn because the gas can't vaporize as intended. If you run your starter long enough to draw some gas down to normal level, your TO will finally start, then run fine the rest of the day, with short down times, so the carb doesn't have time to over-fill again. Rebuilding the carb may, or may not fix the problem. The float/needle valve just isn't reliable/strong enough to insure no gas will leak into the bowl over long periods of down time... thus the need for a good shut-off under the tank.

TRY THIS - next time you go to start your TO after sitting overnight, pull the drain plug on the bottom of your carb first, drain out all the gas (gas shut-off closed), then re-install the plug, open the shut-off, give it ~a minute to refill the bowl and start-er-up. If it starts right up - THAT'S IT.

Also check your spark at the plug. You need a good, fat, blue, snappy spark. The #1 cause of run problems with these old 6V tractors is weak ignition. Yellow, thin spark is NO GOOD.

Buy the way, if your not burning oil, and your wet/dry compressions are similar, you probably just need a valve job. You can do 90% of it yourself. Take the head to a machine shop to be cleaned and valve seats cleaned-up, that is ~ $60.00. Depending on your valve condition, you may need valves replaced/lapped/cleaned. The basic dis-assembly, cleaning, re-assembly of the head is easy to do with common hand tools.

Sorry for the long reply - been there, I know what a 60 PSI engine runs like, ran one for years.

George

[Log in to Reply]  [No Email]
John (UK)

07-24-2006 07:35:07




Report to Moderator
 Re: Hard starting TO-20 in reply to Jerry Cent. Mi., 07-23-2006 15:17:16  
If it's so low it wants the valves grinding at least...should be at least 90



[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