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Farmall & IHC Tractors Discussion Forum

Re: 756 gas tractor running rough

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Bill VA

11-28-2019 14:07:10

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When I was looking for another tractor, I wanted a gas model, larger frame like the 756. I had read that some JD owners had ignition issues with 3020 and 4020 gassers - but I've never read anything about those gas engines not running on today's gas or any other tractor gas engine. Read and even posted regarding larger IH gas engines and their reliability and maybe I didn't read enough, but none the less, I came away with the feeling that a gas 756 would be the cat's meow for no more hours than we'd put on it in a year. I liked the idea of using it in cold temperatures, tooling around and no wet-stacking issues. Once I started inquiring about C291 rebuilds, the whole gas issue and you ain't going to take the C291 to the local engine rebuilder and have it rebuilt because of the sleeve issues, specific knowledge required to rebuild this type engine, special tools required, etc., I'm thinking - what have I got myself into... The C291 is the ONLY tractor engine that I know of that is plagued with these issues. The C291 is truly a POS engine.

The Cummins 5.9... I visited a friend's farm several months ago and he had put a 5.9 into a 706. He did a GREAT job with it and didn't break the bank doing it. He took a 706 good tractor and made it a great tractor. As I mentioned earlier, I don't know that I'd do a 5.9 and ruled it out prior to buying a replacement for this tractor on the farm - but I've still got the 756, everything but the engine seems to be in good working order, and after seeing that 706 with the Cummins 5.9 - I'm intrigued about the replacement again. Maybe not this year, maybe not next year - maybe never, but I'd rather roll the dice and spend the $$$$'s on a Cummins 5.9 transplant in an otherwise good tractor than rebuilding a junk C291.



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The tractor vet

11-28-2019 15:31:55

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 Re: 756 gas tractor running rough in reply to Bill VA, 11-28-2019 14:07:10  
Well like said up till three years ago myself and ALL my friends had either a 706 with a C 263 or the C291 and several 756's and one 766 all with gas . As long as were were paying the 10-20 cents a gallon more per gallon we all got along just fine . Myself , Eugene , Bill Vernon , Ron all did what they were designed for . From heavy tillage pulling four bottom sixteen plows 12-14 foot disc , four row corn planters mowing hay baling hay grinding feed once a week cleaning out the barns and moving snow . Euegen's fuel supplier brought the wrong grade and this trashed his engine just after a rebuild , i knew what i was looking at when i first opened the engine up . To prove my point to Eugene that it was fuel related we hand delivered one gallon of his gas straight out of his fuel tank in a new gas can to the lab in Columbus O for testing . we did not tell the lab who's gas it was , After testing the Lab told us who's gas it was and what octane it was and what all it had in it and how when it reached peak combustion just how HOT it got and how determental it was to a working engine under load as in Industrial app. . The fuel supplier ate the bill as they DID NOT deliver what was ordered . Once thqat probloem was solved all was well , till the next time when a new driver hauled a load of FARM gas and i got to put another set of pistons in . I myself never had and on farm tank and hauled gas to the tractor and combine that was also gas and it ran extremly HOT on reg grade aws well but it did not eat pistons just got hot , that one was powered by a 225 Chrysler slant six . And i fought that one the first year i had it , recored the rad installed a seven blade fan , change the water pump out to and A/C water pump as they move more water and have less drag. and old drag racers trick. . Nothing i did worked till i happened to buy some gas out of state coming home from my bi monthly trec to a sale in In. and i had bought and L shape fuel tank and a square tank for resale CHEAP with pumps and while filling my truck at this one station in Mt Co0mfort they had a pump labled FARM GAS and it was alot cheaper then gas back home and i was starting corn shelling . SO Cheap gas for the combine adds to the bottom line when doing custom work so i filled both tanks with a little over 200 gallon back then for like 65 cents a gallon compared to the 92 cents a gallon back home . The combine was running great and OH guess what instead of running at 220-240 it is now running at 185-195 . I( was being cheap with the combine as normqally when i went to go play farmer i would fill my pick up up with gas and fill my 105 gallon tank with the same hose qand i ran HIGH TEST in the truck due to the 460 i had stuffed in it and it was built to 1970 spec.s so the tractor as i had only one tractor of my own at that time frame i had no problems with the C 291 . Yes I H could have buiolt a better gas engine , they could have put seven main bearing in it , they could have added in a half dozen more head bolts , they could have made it across flow head , they could have taken a lesson from Chrysler and made them a Hemi head with four valves and might as well go with dual dist. and dual plugs per hole add in side draft webber carbs as well. I think three would be good. The only thing we need to get these old gals back to work is a good gas , don't even need the lead just good gas of 93 octane 95 would be a lot better and you could bump the ing timing up five degrees more and watch it come alive . Yes i have played with them seeing how much more ya could get out of one just by tuning and tweaking here and there. My late model 706 with a C junk 291 would NORMALLY pull my 710 4x16's in High one in sod and hardly had to use the T/A . If you were in last years corn ground and could stay in the seat then ya could run second high , little hard on shear if ya had rocky ground but she would run with it . I had a ton of money in that one as i had to give 950 for it in the DEAD ROW .

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