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756 power lost under load

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DJ's Tractors

05-22-2007 07:19:45




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We have a 756 gas which loses power when under a load. It spools down then will backfire. You can shut it down, wait a minute, start it back up and it will pull for a while then do it all over again.




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cjd12000

05-23-2007 05:11:34




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 Re: 756 power lost under load in reply to DJ's Tractors, 05-22-2007 07:19:45  
Lets say 87 to 93 octane price diffrence is .30 cents and using the wrong lower grade fuel cost you and engine rebuild every 1000 hours. If you consume 6 gallons an hour it would save $1800 dollars to run this 87 OCTANE. HOW MORE LIFE DO YOU REALLY GET OUT OF RUNNIG 93 OCTANE TO JUSTIFY $1800 EVERY 1000 HOURS. You might even go 2500 hours if you only do light work. I bought a 706 gas and dont plan on using it heavy. Rather let the deisel do the heavy work. I.E. plowing, and mowing with discbine. Everybody needs will be diffrent but I cant justify .30 cent more a gallon just to prolong the inevitable of an engine rebuild. Just be smart gas tractors dont hold up to heavy loads as well as deisels but I find them more user friendly during are cold winters.

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the tractor vet

05-23-2007 07:00:10




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 Re: 756 power lost under load in reply to cjd12000, 05-23-2007 05:11:34  
well as for myself i realy like to see over 3000 hours of HARD work out of one . and i can tell ya this that yes they do start when it is realy to cold to be out side but that is farmen and if ya plan to use it to grind feed on the 87 or use what ever for oil hope that ya have a nice warm shop to work on it . like i said before on here after having the gas of today lab tested at my expence and revieuing the test results on just how hot 87 burns over the 93 and the end results on the NEW pistons that you get today they will not take the extra heat. number one the Org. pistons were a Forged piston the new pistons of today are of a Cast design . Forged can handel heat better as it will allow heat to be transfered to the cyl. walls faster and allow the top of the piston to cool faster where as the cast piston is way cheaper to make and does not allow the heat to transfer to the skirts as fast holding the heat on top . I do not care where ya buy your kits from because they all come from the same mold , if ya go to your friendly Case I H store and buy them ya payalmost twice as much for the kit as you do aftermarket just so ya have the I H part # stamped on the top as forthe #'s on the side or casting #'s they are the same as the ones ya get from the aftermarket suppliers . This reg. gas is not even good for older trucks that try and work for a living . As for seing combustion temps showen up on the tempure gauge that will not happen as that heat goes up so fast that it does not have time to sink in to the coolant to show before damage is done. Yes it cost alot more to buy the correct gas today , but keeping it running and not spending money on overhauls or pullen the head to replace burnt valves every two weeks as we have been down this road a couple times tomany with our owen tractors and also customers tractors that now we have switched over to the low ash oil and run the 93 they run like they should and up till the fuel has gotten out of hand we run them every day . So for the time being we are going to try and use some of the 4 other older tractors to try on the haying and see if we can reduce the operating cost a littel bit plan on putting my S/H on the hayrake have the old Cough choke John Deere 720 diesel on the haybine and that is not working out well as it does not have enough hyd's to lift it going to look into that this afternoon. parken the 706 and the 1066 maybe pull the wide ft. out from under the 706 and putting it under the 806 going to try and get Dusty's old H running again and put a good tune up on the old J D A for pullen wagons and install a ft wagon hitch on it to PUSH the wagons up to the barn . If ya want fuel economie then best go find a old MD - 450 D or a old 720 - 730 or some old David Browns or dawn your Blue shirts and pants with no buttons and get a couple teams . Also i realy do not like rebuilding and engine every year as we put on more then a 1000 hours a year on the 706 a year.

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BP

05-22-2007 10:16:15




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 Re: 756 power lost under load in reply to DJ's Tractors, 05-22-2007 07:19:45  
For me it was cheaper buying a set of plugs rather then Buying the REAL EXPENSIVE gas!!! I don't know maybe Gas is cheaper in your area.



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the tractor vet

05-22-2007 11:40:13




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 Re: 756 power lost under load in reply to BP, 05-22-2007 10:16:15  
Well if ya think that is the cure and ya know more then me then hey go for it and gas at the pump today in my area is 3.799 a gallon for 93 . Now also what is the cost of a overhaul kit , machine work decking the block plus labor ?? But like i said what do i know after all these years worken on them FOR A LIVING.



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GAF

05-22-2007 12:14:12




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 Re: 756 power lost under load in reply to the tractor vet, 05-22-2007 11:40:13  
I wouldnt deck the block. That would give it more compression, thus making the situation worse. By the way what heat range spark plugs do you have in there anyway.



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the tractor vet

05-22-2007 17:49:23




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 Re: 756 power lost under load in reply to GAF, 05-22-2007 12:14:12  
We have been running C86 A/C and motor crafts and off hand i do not remember the # on them with out going up to the tractor and looking . . Also over the years that these tractors have been around who knows how many times that head has been off and milled 7-10 thousants because of burnt valves because of not running the proper OIL that one took me some time to go with what the Factory said to use now since i saw the light we have had nomore burnt valves. I keep sayen this over and over the GAS BACK WHEN THEY WERE NEW was 95 OCTAIN and THE LOWEST THAT IS SUPPOSE TO BE RUN IS 93 with NO ALKIYHOL NO MTB NO MTD If ya do not have and owners manual for your tractors it is in your best interest TO GET ONE and READ. The things one can learn from reading a book is unreal.

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K.B.-826

05-22-2007 16:36:07




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 Re: 756 power lost under load in reply to GAF, 05-22-2007 12:14:12  
So you must know another way to repair a block that's warped or has been damaged by running the engine with the head gasket blown between two cylinders? The compression in that engine was high enough from the factory to require high octane gas, surfacing the block isn't going to make much difference.



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BP

05-22-2007 09:39:46




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 Re: 756 power lost under load in reply to DJ's Tractors, 05-22-2007 07:19:45  
I have a 706 that did the same thing. I had to put cooler sparkplugs in and back the timing off 1-2 degrees. Now it works fine. It was trying to pre-ignite the fuel in the intake.



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the tractor vet

05-22-2007 09:55:10




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 Re: 756 power lost under load in reply to BP, 05-22-2007 09:39:46  
Not realy if ya run the plugs that are ment to be in that engine then there is no problem with running that engine at the said spec. the problem comes from the gas and even worse if it is laced with ethenol MTB or MTD. Running them on the fuel that they were made to run on they work like they should . I have been down this road for many years and been running 706 gasser for the last 30 years . Now if ya was close i would have ya come and run the 706 gassers that we have and see what they do as they are set as per the book and run the gas that the book calls for . Could get a couple more ponys out of them if we could get better gas. Now with the changes in diesel fuel i am just waiten for the onslot of pumps that i will have to run over to the pump shop like the last time . And who knows what will happen on the inside of the engines as time goes on .

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the tractor vet

05-22-2007 09:39:00




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 Re: 756 power lost under load in reply to DJ's Tractors, 05-22-2007 07:19:45  
Change the gas that you are using and go with 93 octain as per the BOOK CALLS FOR and check the timing at full throttel and amke sure that it is not going over 18-19 degrees at high idel. Make sure that ya have fulkl fuel flow to the carb. Now the bad side of this is ya already HURT the motor. as what has happened here is ya got her super hot on the pistons and yea i know the tempture gauge never went up , the pistons will get so hot that they are just starten to melt and seezen to the cylinder walls this is why it is pullen down . Yea i know 93 octain gas is not cheap as of today it is 3.799 a gallon here took a big jump today. Getting to the point thatmaybe allof us that can tough it out just plant enough to feed enough stock to feed yourselfs and family and enough garden for the same and let the oil co. CEO's eat there gas.

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RustyFarmall

05-22-2007 07:28:14




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 Re: 756 power lost under load in reply to DJ's Tractors, 05-22-2007 07:19:45  
Possible fuel restriction. Clean the sediment bowl. Clean the inlet fitting in the carb, and look for a foreign object in the gas tank. Don't know if that model uses a vented fuel cap, or if the tank is vented in another way, but it has to be vented in some form. You might try running it briefly with the fuel cap removed.



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