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Farmall & IHC Tractors Discussion Forum
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Re: 756 gas tractor running rough

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rustred

11-28-2019 17:50:20




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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.

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cdb

11-28-2019 19:56:25




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 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.

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The tractor vet

11-28-2019 23:14:01




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 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 .



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Cdb

11-29-2019 09:01:16




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 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.



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The tractor vet

11-29-2019 16:20:43




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 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 .

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