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706 repair

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ChadS

02-26-2004 19:50:23

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Just got in a nice Ih 706 gas for repair. It is a one owner, and has 1300 original hours. It had a miss it the engine, I knew it was a valve bad. Few hours later, Yep, #2 exhaust valve, burned up. So I went got a new valve, and reground the all of the valves, and put the head back together. Go to do some degreasing on it, then put it back together. The owner said, they raked, and baled 15 acres of hay with it each year. That was it,, put her back in the shed. What puzzles me is that for so little usage, the valve burned up the way it did. On the combine engine I put in my 460H had a valve burned the same way, Was the OEM valves a weak link? Made of a cheap material? The other valves looked good, The 706 did not use, or burn oil, started good, Well, hopefully in the next day or two the 706 will be ready to go to the hay field soon. More later, ChadS

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Scott

02-27-2004 20:52:06

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Re: 706 repair in reply to ChadS, 02-26-2004 19:50:23

I have a 706 gasser with the 263 that I only use to feed hay in the winter. I've had trouble with the intake manifold gasket going out. It's always the center port that leaks. The out side ports have rings that hold the gasket in place. I've had the manifold planed and the head is straight and I keep it torgued properly but still about every 2 years {300hrs}she leaks. The dealer machinic says its a very common problem and if you work it hard with it leaking it will burn or stick a valve. As I understand there is 2 types of gaskets thick and thin. The 263 uses the thin one. a peice of metal with 2 peices of gasket materal glued to it. Is there a better made gasket out there than the caseNH one?

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ChadS

02-28-2004 06:03:45

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Re: Re: 706 repair in reply to Scott, 02-27-2004 20:52:06

I always use a copper coat spray on the manifold gaskets. It is a high temp sealer. May help your 706. Chad

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Aces

02-27-2004 10:55:09

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Re: 706 repair in reply to ChadS, 02-26-2004 19:50:23

ChadS

I think you could have the classic valve problem we had back in the 60's in the IH 6 cylinder engines, 263 291 301 gas engines. We had carbon build up on the valves and spark plugs bad and valves brunning bad. I know some one going to say I don't know what I am talking about, but I was there and DID THAT AS THEY SAY. That is when champian made a good plug some say they don't now. The D18Y did the job if and here is where people will say he is full s it but it was all oil. When IH came out with there # 1 Engine oil we stopped all the problem, tractors with 100 hours and didnot run good and not good power whent 2500 3000 hours with the IH oil. We fixed them in different ways some complet overhaul if bad enough some we pulled the head off clean the carbon off good and put the head back on and they run good for years with the IH oil. IH made alot of oil companies mad but the oil did the job.

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the tractor vet

02-27-2004 11:50:49

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Re: Re: 706 repair in reply to Aces, 02-27-2004 10:55:09

Yep , i must be getting old as i forgot about the low ash oil thing this is also a must use in a I H gasser and you should stick to the 30 weight for most work in all temp,s. and even go to the 40 weight in hot weather for the heaver work , but most people that are running them today use them for CHORE work and the 40 weight is not a must .

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ChadS

02-27-2004 11:30:01

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Re: Re: 706 repair in reply to Aces, 02-27-2004 10:55:09

That does make sense. Was the IH oil a heavier, or a detergent oil? I have another 263 I have been working on for a puller, It is out of a late 403 combine, Dad always ran 15 40 in it, never smoked, did burn a valve in it, after a valve grind. So I put in a new valve kit and guides the whole nine yards. I run 10 40 in it and it smoked. I went back to 15 40, and it stopped again. The compression is all good, around 165 psi. So the rings must be ok. Had a chevy truck that was like that, had to have 5w 30 in it, if you put 10 40 in it, smoke!! ChadS

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the tractor vet

02-27-2004 09:38:03

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Re: 706 repair in reply to ChadS, 02-26-2004 19:50:23

And also make sure that the total advance timing is real close to spec. I have found that with the age of the tractor that the dist. may need to be gone thru and the centrifcal advavce my be sticking or going to far. and you must make sure just what engine you have and make sure that the dist. is the correct one for that engine as the 263 has a differnt timing then the 291. and also watch that someone before you did not up grade to the 263 to the 291 in the same block as the 263. If they did not go up in jet size on the carb after the increase in bore then she is running to lean and lean is mean. And YOU HAVE TO RUN THE 93 gas on them.

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Farmall Don

02-27-2004 05:11:27

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Re: 706 repair in reply to ChadS, 02-26-2004 19:50:23

Make sure you use a minimum 93 octance gasoline and ensure proper timing. Ive got 3,100 hours on mine and had a valve job at 3,000. I had the valves and seats replaced to a different type, because mine went through valves as well. Good machine! Also, it likes to use a lot of gas.

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the tractor vet

02-27-2004 12:01:39

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Re: Re: 706 repair in reply to Farmall Don, 02-27-2004 05:11:27

I farmed for years with mine and it would use around 30 to 35 gal a full day plowen with 4x16 710's behind it and i never thought that it was that bad on fuel and pullen the planter it would use a tank every two and a half days . My 806 D will go thru a tank of fuel a day plowen with the same plow in the same gear as the 706 in sod 4th low and corn ground 1st high but my old 706 was a late model with the 291 and it always empressed me on the power that it had i ran it till there was nothing more in it then a parts tractor. Like the shoe repair man his kids go bare foot the tractor repair mans tractor is the last to get fixed it was easier to get a new tractor then to take the time to fix my owen.

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ChadS

02-27-2004 06:27:43

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Re: Re: 706 repair in reply to Farmall Don, 02-27-2004 05:11:27

The valves had carbon deposits everywhere, and a yellowish, chalky residue built up. Makes me wonder if that was left over from leadded gas from back then. I put in new valves, the works. This is one sweet 706!! Not very many you find that is not beat all to heck, and you can shift it like it was new!!! iT HAS A 263 GAS with firecraters. Yep, well aware of fuel consumption, my 460 puller, is a 263, I turned up the carb to make some power, it will gulp a gallon of gas in less than 2 mins just idleing!! LOL Chad

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