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Argh! #!%*!! No good news on IH 1206

D

Dave from MN

Well-known Member
, was dyno"d. Looks like it needs a rebuild. ouldnt get the loaded Hp, only hit 55. Compresion is about 60% of what it should be. Not liking this at all. Just had the whole drivetrain rebuilt. Called previous owner and he doesnt understan , says he used it to pull a 5-18 plow the other year prior to me buying and he said it had no issues, just smoked alot under the load. This 1206 is becoming quite an expense. Basically it will be a new tractor, but with paint and all this shop work I will probably have $10,000 into it. Yuck
 
Thats the way it goes with old iron. At least when your done with it you will know its good from back to front. Really, $10000 isn't bad for all that work with the cost of things these days. See how far $10000 goes at the local dealer with a new machine, maybe a big lawn tractor. Before you tear into it make sure your fuel system is working properly. Filters, lines, return, could have gotten some debris into something when they had it apart for the other work. If an overhaul is actually needed make sure whoever you have overhaul it knows what they are doing when it comes to those IH dry sleeve diesels.
 
If it has enough compression to start and run on all 6 cyls it is not the compression that is holding you at 55 horsepower. NO way.
 
our 1206 has 225# compression which is half what it should have and it will pull 140 on our dyno. you must have pump troubles or something else.
 
If you were loosing that much compression past the rings you should have about as much blowby as exhaust. Have you checked for a restricted muffler, collapsed air duct hose, or a very dirty air filter?
 
I havent been following what you have all had done, but like the other guys said I would make sure the pump is not the problem. Our G1000 MM's would act like that with a bad pump, and I think the 1206 uses a very similar roosa master type pump. There are quite a few 806,856 and even a 1206 around the neighborhood that are still used daily and have never been opened up. But like Scott said they are a tempermental engine to overhaul from what i have heard. Good luck with it.
 
check the pump and the injectors before you tear that engine apart. I am overhauling an 806 right now, but it spun a bearing because my oil plug got sabatoged one night.
 
Sorry to hear that. I know the frustration these tractors can give! I hope you don't need a rebuild, but if you do, I can give you the contact name of the company that I bought my 886 I.H.engine parts from. By far the most reasonable I found, and very good to deal with.
 
Naw, not even. Someone is trying to sell you the old hose treatment. :>(

Like the big dogs say, if it starts and runs something else is causing your greif.

Air or fuel. Those diesels need lots and lots of air; I'd check there first.

This happened to me yesteday, so it's fresh in my feble little mind. :>)

Allan
 
There is some blowby, and she does blow pretty darn black smoke. What all should be looked at first? Timing, injectors? I do know previous owner did use a sniff ot eather to start. Tractor has 7000 hours.
 
When in doubt start with the cheap stuff first. You would hate to pour a bunch of money into it only to find the air cleaner full of mouse nest. I agree with the others. If a diesel has enough compression to start and run it has enough compression to run strong if the other stuff is right.
 
If its an ether hog it may have cracked rings. I've seen that with 44 series JD loaders at work that ran pretty good and didn't use a lot of oil. But the operators wouldn't plug them in in winter or low batts so they put the ether to em. When we pulled em down the rings would be cracked.
 
Ihad one a few years back. It was a tough tractor. I was told that the first ones had some sort of ring problems that required either to start then was good to go rest of the day. Mine was like that. The harder you pulled it the more it smoked and more the motor moaned. I would check for air restrictions and other cheap and easy things first before tearing into it.
rw
 
Like the others have said check the air system firs which includes checking the clearance on the intake valves and make sure the rocker assembly is good and tight,I bought a WD AC once that had lost most of its power and owner was told by a shop it needed an overhaul a couple twist of the nuts on the rockershaft and it ran like new.Also a rocker arm could be bent.Lots of little things can cause big trouble.Since its starting good I guess you can rule out water in the fuel but just a little water will make a diesel smoke and loose power
 
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