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656 gas hog

Well does it smoke black like its runnung to rich? Mine isnt that bad, i dont think it uses any more gas than a 656 diesel uses diesel. I have a 666 and it was running real rich had to put a adjustible jet on it and now it runs great. Erik..
 
Well, I'm not sure Exactly, But as I recall from my 806's owner's manual, when you are going to do light work with it, turn the main fuel in (leaner) 1/4 - 1/2 turn, opposite for heavy work. No old timer has told me to do that, though. I've never tried it, I have a Diesel, and I never did that with my M, either.
Give it a shot? -Andy
 
change the air filter and make sure there are no fuel leaks. Make sure engine is in sound mechanical condition. Make sure the high idle speed is set back to factory specs. Make sure you have the right carb and right jet with correct venturi. Heat riser should be operating properly as well as thermostat.

656 should be good on fuel with light loads and only bad under full load or in winter time. We see 4 gallons an hour on forage chopper (when new in 1970s) or discbine.

also, any chance you have a neighbor getting free gas from you?

karl f
 
Unless the fuel needle valve has been changed the his tractor came with a electric solenoid & there's no adjustment. Just open when the key is on & shut when the key is off. I have seen them changed over to a manual adjustable fuel screw but don't have a p/n
 
I had to take the electric selonoid valve of because no matter what i did i couldnt get it to run right and it would fouwl up the plugs in no time. Put a adjustible jet on and it was a different tractor all together. Now it just purs.
 
Those 6-cylinder gas engines are THIRSTY, and if you want the engine to last, it has to be premium 92+ octane fuel...

Unless you have it set way too rich, or there is an obvious leak, there isn't much you can do except not run it.
 
*12+ horsepower hours per gallon of gas according to Nebraska tests, one of the more efficient gas tractors since the first test. At stock horsepower and full load, it's gonna be a high volume of fuel, 5 gallons an hour if my math is right. MBHP divided by HPhrs per gallon is what I used. Furthermore, a 656 diesel is rated around *12.5 HPhrs/gal, meaning they're about the same efficiency under full load--although Hugh MacKay always said his 656D would do 2 gal/hr pulling 5 bottoms (canada vs usa gallons imho). Every individual tractor is different so there are variations either way from the test tractor's results and the individual tractors' observed performance.

FWIW, a C farmall is in the 10 or 11 HPhrs/gal family, less efficient, but at its hp, the gallons per hour are not very much.

If you are after efficiency under full load, go diesel and much newer. If you need to stay older, borrow C H Wendel's Nebraska Tests (thru 1984) and look at the index in the back where it ranks efficiency by fuel type. There is probably a resource online for the newer stuff as well.

karl f
ps I've been reading the Wendel book this week. The most memorable thing I have read: is a bigger (115 hp area) tractor that is very efficient is the Case 2096 at 17+ HPhrs/gal.

(edit: * = numbers not accurate)
 
Ok, I'll buy that, I knew the solenoid is there, as I've worked on a friend's 656. (Obviously not on the carb.) I just thought it was a shut off, not necessairly the main fuel, also.
-Andy
 
karl f,

Nebraska test #909 for a Farmall 656 gas shows an average efficiency of 9.59 HP-Hr/gal, and a peak of 12.26 HP-Hr/gal

Nebraska test #912 for a Farmall 656 diesel shows an average efficiency of 12.37 HP-Hr/gal and a peak of 14.38 HP-Hr/gal

I don't know where you get your 12 and 12.5 figures...

On average, the diesel is roughly 29% more efficient than the gasoline tractor. At peak output, the diesel is 17% more efficient than the gasoline.
 
(quoted from post at 10:28:16 02/25/11) 12+ horsepower hours per gallon of gas according to Nebraska tests, one of the more efficient gas tractors since the first test. At stock horsepower and full load, it's gonna be a high volume of fuel, 5 gallons an hour if my math is right. MBHP divided by HPhrs per gallon is what I used. Furthermore, a 656 diesel is rated around 12.5 HPhrs/gal, meaning they're about the same efficiency under full load--although Hugh MacKay always said his 656D would do 2 gal/hr pulling 5 bottoms (canada vs usa gallons imho). Every individual tractor is different so there are variations either way from the test tractor's results and the individual tractors' observed performance.

FWIW, a C farmall is in the 10 or 11 HPhrs/gal family, less efficient, but at it's hp, the gallons per hour are not very much.

If you are after efficiency under full load, go diesel and much newer. If you need to stay older, borrow C H Wendel's Nebraska Tests (thru 1984) and look at the index in the back where it ranks efficiency by fuel type. There is probably a resource online for the newer stuff as well.

karl f
ps I've been reading the Wendel book this week. The most memorable thing I have read: is a bigger (115 hp area) tractor that is very efficient is the Case 2096 at 17+ HPhrs/gal.
Click to expand...

2096's can be had relatively cheap as well. Not nearly as cushy as a JD of that era, but cheap HP.
 
figures were best of my recollection (not direct
quotes) from paragraphs and index of Wendel's book,
So my comparisons are mixed up. I should have gone
to the actual tests, but didn't want to wait for a
pdf to load on dial up.
Sorry about the confusion!
Thanks for posting the exact numbers!

-karl f
 
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