Welcome! Please use the navigational links on your left to explore our website.

Company Logo Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Farmall & IHC Tractors Discussion Forum

Re: 756 gas tractor running rough

[Show Entire Topic]  

Welcome Guest, Log in or Register
Author  [Modern View]

11-28-2019 17:50:20

Report to Moderator

I think you should give some info here on how long you have owned this tractor, AND how hard you have worked it, and what you actually do with it. I do know in cold weather they need to be warmed up. AND this blow by thing? do a compression test on it and post your results. this gas thing applies to hard working engines, running around the yard using it as a quad I hardly think you have scored pistons. but need more info on this.

[Log in to Reply]   [No Email]

11-28-2019 19:56:25

Report to Moderator
 Re: 756 gas tractor running rough in reply to rustred, 11-28-2019 17:50:20  
I have read The Tractor Vet's theory on this motor for years regarding the gas, oil, and scored cylinders. I believe what he is saying and have tried to follow his advise. I use premium fuel and IH 30 wt oil. I am not a mechanic....just an acreage owner that loves old tractors. I am just hoping his theory is not correct in my situation!

Background: I have owned this tractor for 9 or 10 years. Right after I bought it, I found out an exhaust valve was torched. I had an experienced IH mechanic nearby re-do the valves. At that time he said the cylinder walls looked very good. I had it completely tuned up: plugs, wires, cap, rotor and he set the timing for me. It has started and ran very well over the years. I know it is very cold blooded in the cold. I usually plug it in for a while on real cold days. I let it warm up before I use it.

It does not ever get worked hard. It is used mainly for pushing snow in the winter and to take tree limbs and brush to the burn pile. I use occasionally to help a neighbor move stuff around. I do not pull a plow, cut hay, rake or anything strenuous with it. I have put probably less than 150 hours on it in 9 or 10 years.

It seemed like it was down on power last year before winter, so, I changed the spark plugs to NGK. It immediately pepped up...started and ran great with lots of power. Like I mentioned earlier, it blasted out a bunch of black soot/carbon/??? out of the exhaust. Still ran great. Earlier this year, I noticed it seemed to chug a little at higher rpms. Last weekend I moved a bunch of tree limbs in @ 20 degree weather, it seemed like there was more blow by coming out the tube. I was not running it hard...just slowly dumping debris into a burn pile. I don't know if it was oil...or possibly condensation in the oil burning out?? It was running for about 1 1/2 hours while I chain sawed and piled on tree limbs. The temp gauge barely got above the C on the low end.

I do not have a compression tester or any scope to check cylinder walls. I plan to check out some of the suggestions given: check the manifold bolts, check the muffler to see if it is clogged...etc. I did check the air filters..both inside and out and they both look good. What spark plug is recommended for the c-291? It ran better with the NGK...but, am willing to try something else.

[Log in to Reply]  [No Email]
The tractor vet

11-28-2019 23:14:01

Report to Moderator
 Re: 756 gas tractor running rough in reply to cdb, 11-28-2019 19:56:25  
Stock muffler is basicly a straight thru design . so unless someone stuffed something in there .

[Log in to Reply]  [No Email]

11-29-2019 09:01:16

Report to Moderator
 Re: 756 gas tractor running rough in reply to The tractor vet, 11-28-2019 23:14:01  
Kind of what I thought. But, I am looking into the top and see a metal plate straight down...with holes on both sides of pipe where exhaust blows through....suppose it could be partially blocked.

[Log in to Reply]  [No Email]
The tractor vet

11-29-2019 16:20:43

Report to Moderator
 Re: 756 gas tractor running rough in reply to Cdb, 11-29-2019 09:01:16  
NO , after i said that about almost straight thru old age here i was thinking 706 muffler , on the 56 they went oval to reduce noise levels . so i9t hqas a little bit of baffling and NO i don't think or ever hard of a tractor muffler plugging . For it to plug it would have to burn oil so bad that you would be hauling oil to it by the tanker load and as far as old lead deposits Nah ain't happing . In here prime you can bet she got the snot worked out of it and at night the exhaust pipe and manifold had the high pro glow . I did a lot of night farming due to keeping everybody else in the field during the day and i could do mine under the cover of darkness . When plowing my exhaust manifold waws glowing bright cherry red and half way up the muffler and standing 3-6 inches of flame out the top . Gassers run way hotter then diesel even if you turn up the wick . To get any color on a diesel manifold you really got to turn up the wick and leave a trail of black they can see for miles like my old 450D would put out as i really had the wick turned up on it .

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

Hop to:

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 © 1997-2020 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