rescued a 706, have engine questions

I picked up a gas 706, guy was using it and it locked up in a cloud of smoke. Well the oil is still black, but I can see the valve sitting on the piston in cyl 3. I'm betting the head is junk? It will turn yet as I just rocked it in gear and seen the fan move. Would the crank handle a hit like that or should I be lookin at a complete engine vs parts to fix this one? Thank you!!!

Nobody knows for sure, but if you could find a 263, in a 403 combine or where ever u can,i think it will be cheaper in the long run.

The first thing to do is to tear it apart and see just what you have. May be fixable.....maybe not. but check it out first.

What red said, take the head and pan off of it, see
what is left. Check the timing chain, those old ih
engines used to break them once in awhile under
heavy load.

it's had a pretty easy life for the last 5-6 years, it mowed ditches once a year with a 4-5 foot mower.

No timing chain just crank gear to idler gear to cam gear. Most tractor engines do not have timing chains due to the greater reliability of gears. Chains are used in automotive applications because they run quieter. But that is not to say that there is no possibility for your 706 to have camshaft gear problems.

This is the beast here

have a uc263 eng. low hr.

Nice looking tractor!

I wouldn't even mess with it; just go get another engine out of a salvage yard. Lots of 6-poppers lying around.

Allan

IH2526, where are you located? What are you asking? I can't pm you

Get a 301 out of a 715 combine and put in it. Keep the 263 for the needed parts to do the switch.

Nothing like several suggestions, most going in different directions. All gasoline combine engines are sleeveless. Good share will be stuck from sitting around. Others will be worn out form dust and dirt. I (just me) would pull your engine down so see what you have. You would need to pull a replacement apart as well to see what you have. As for your question about hurting the crankshaft, not likely if valve was problem, head, probably. Piston, likely. If the smoke was from crankshaft bearings, whole different situation.

I'm going to go with the "Pull the head" crowd. You might get by with just a valve job. IF there isn't a hole knocked in the piston. And if there is, well, a rebuild is the next step and then you know what you have. Just my two cents worth. Based on your picture, I'd say that you would be money ahead.

Well as for me and i would say i know 706's i would pull the hoods and fuel tank then get the head off then the pan . Yep more then likely your going to need a head Yep your going to need a piston if not all six . IF by chance the block took a hit in the bad hole then the block is going have to come OUT . IF the block is not to bad it can be repair sleeved and rebored to take a stock sleeve. Now you have two options here you can build it back to stock or you can bore all six holes out and make it a C291 with the C263 to 291 change over . The down side now ah days with the later gas tractors is find gas that will run in them . Later 4 cylinder and 6 cylinder gas engines do not like 87 octane gas because back when they were built gas was of a higher octane and MOST reg gas back in the day was of 95 octane the only gas that i knew of that was less octane was put out by Gulf Oil and it was around 92-93 and it would make a old 6 cylinder Chebby pick up ping and knock . Org owner's manual states a min. of 93 octane gas is to be run in them. We have run 706 gassers for years and have had a few major problems if we got a bad load of gas . This has happened four times over the last twentyfive years . Now our fuel supplier tells us that the best he can get is around 91-92 and NOPE that is not working out for us as i have one down now with a piston out of it and just got the other one back up and running due to valve problems since the one hired man dumped the wrong oil into it and it ate not one valve but three . When asked what oil he had been putting into the tractor he told us Oh out of the drum by the door not the one in the back of the shed as the one by the door was closer that drum is diesel oil not the LOW ASH . MYSELF I AM NOT SURE IF I AM GOING TO REBUILD OR IT IS GOING TO BECOME A TRANS PLANT . Been installing several Cummins into Olivers and now have a 3.9 BT in one a 8.3 in another one and a 5.9 hanging on the chain hoist to go into the 1950 and we have been talking about doing away with the gas engine in the 1850 and Cumminsfing it . We liked the gassers when the weather gets cold and the snow fly's because even at minus 35 below they start warm up faster . When ya have to grind a batch or two of feed when it is cold out last thing ya want to do is mess around getting a diesel started that has been setting for a week or two .

I got the head pulled, the exhaust valve on number 3 broke. It busted a hole in the head and gouged the piston pretty good, I think a head and 1 piston and it'll be good to go again. There isn't really any ridge to speak of in any of the holes. I was expecting it to be way worse that it turned out to be. I'll still be into it cheap enough after fixing it

Have the rod checked. Could be bent.
Dennis

will definatly get the rod checked out