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Farmall & IHC Tractors Discussion Forum
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756 overhaul

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Alex in Texas

12-04-2006 13:01:55




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I am in the process of overhauling a 756 with German 310 diesel. I originally planned on doing an inframe overhaul, but had to split the tractor to get to rear (#7) main bearing. The tractor ran great, but was getting coolant in the oil due to (I think) deteriorated sleeve packings. My question is: Should I suck it up and go ahead and pull the engine and do a major overhaul since it is already split? The tractor has no problems other than the coolant in oil. But is there a good chance that the cam bushings were trashed by the antifreeze? The engine has 5,400 hours on it. Thanks guys for any suggestions or info.

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Alex In Texas

12-04-2006 20:07:29




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
I figured that was the response I would get from most of you. I guess a major is definately the right thing to do. I did mic the rod journals and they come out just within standard tolerances. None of the crank journals have any grooves or streaking. This tractor mainly pulls a four row planter, a grinder/mixer, and square baler--no hard work. It will probably not get but 2,000 more hours put on it in the next 10 or 15 years. I am definately going to have the head checked out and valves ground or replaced. But this tractor ran so smooth, was strong, and never smoked a bit. It would start easily down to about 40 degrees. The bottom shells of the main bearings are a little worn looking. I would much prefer to replace sleeves, pistons, and bearings. I don't have an engine stand or rear main seal installer tools, etc. If not for the coolant in oil, I would never have laid a hand on this sweet running engine. It would start easily down to about 40 degrees. By the way, the oil pressure ran at about 20-25 lbs when hot (Not sure how bad that is). Do you guys think that for a low use tractor the in-frame O.H. might be ok?

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El Toro

12-05-2006 13:17:08




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 Re: 756 overhaul in reply to Alex In Texas, 12-04-2006 20:07:29  
If you don't do it as the Vet has suggested, you may be be doing it twice. Hal



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the tractor vet

12-04-2006 17:45:45




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
You are this far along sooooo o pull it and go thru it totaly with a line bore decking of the block and have the crank checked block hottanked and new cam bearings to a complet rebuild on the head and like others have said about the valves the machine shop better know what they are doing or she will be a smoker and hard to start . When i did them we would install new seats to keep the valves at the correct height . If this job is done correctly then it just may out live you . And this way you know what ya have and as far as price of and in frame over a out of frame it ain't worth talken about .

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K.B.-826

12-04-2006 16:09:57




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
Well, since you've got it split, all you've got to do is unscrew a few engine to frame rail bolts and you'll have it out. I am definetly not a fan of in-frames. To me, a full overhaul on a diesel enigne means new pistons and sleeves, have a machine shop check the crankshaft, replace the camshaft and lifters if they are reasonably priced, rebuild the water pump and oil pump, send the injection pump and injectors out for a rebuild, replace the vibration dampner, and have a machine shop recondition the cylinder head. With the German diesel, make absolutly sure that the machine shop doesn't grind the valves to the point where they are recessed into the head below spec, or it will be extremely hard starting when cold. If in doubt, replace the valves.

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Josh in Pa

12-04-2006 15:15:47




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
I'm doing the same on an Oliver. Started with an in-frame and progressed to a total rebuild. I think if the engine is out, I would take it in and have it cleaned and magnafluxed. Clean will make it nice to put back together, and you won't get it back together and find that the block is cracked. Josh



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Marv

12-04-2006 14:40:45




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
I have two 756 D310's I have overhauled. The first one had 9000 hours on it when I noticed antifreeze in the oil. I replaced the sleeve O rings as well as the sleeves and pistons. That was 1000 hours ago and it is still running great. This was an inframe overhaul.The second one was a tractor I bought. The previous owner took the head off and allowed water to get in the engine. I had this engine bead blasted because of the rust. On this engine the cam was removed because of the rust. To replace the cam, the engine had to be linebored which cost about $200 but worth every penny. I put new sleeves and pistons in also. The heads on both engines were OK. I did replace some exhaust valves. Marv

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Michael Sheik

12-04-2006 13:20:53




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
This is exactly the kind of question that I would expect Tractor Vet to be chiming in on. As I look down I am not seeing him much if any. Hope he didn't abandon us too!



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Rustyfarmall

12-04-2006 14:08:33




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 Re: 756 overhaul in reply to Michael Sheik, 12-04-2006 13:20:53  
Tractor vet hangs out over on the talers board quite a bit. I think he is also involved in a home remodeling project? might just be he's busy.



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the tractor vet

12-04-2006 17:39:58




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 Re: 756 overhaul in reply to Rustyfarmall, 12-04-2006 14:08:33  
Yep i am tryen to become a drywall finisher and i had better stick with fixen tractors .



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Allan In NE

12-04-2006 13:42:25




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 Re: 756 overhaul in reply to Michael Sheik, 12-04-2006 13:20:53  
Everybody is mad at everybody else. Think it is the winter solstice 'er something. :>)

Allan



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Rustyfarmall

12-04-2006 16:32:36




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 Re: 756 overhaul in reply to Allan In NE, 12-04-2006 13:42:25  
Me mad? Not me, can't afford it.



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No tools

12-04-2006 14:36:08




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 Re: 756 overhaul in reply to Allan In NE, 12-04-2006 13:42:25  
Allan Why is it?????
when we got mad no one cared????
All well
they got over hit. Bill



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Joe Evans

12-04-2006 13:09:42




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
At this point, you might as well go whole hog and do it out-of-frame.

Do the check out of the engine thoroughly, and repair anything NOW that is suspect. This way you will know the girl will go another 10,000 hours.

Peace of mind.

My two bits' worth.



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Farmall Freak

12-04-2006 13:06:00




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 Re: 756 overhaul in reply to Alex in Texas, 12-04-2006 13:01:55  
Might as well do a major overhaul and never have to touch the tractor again rather than taking the chance of not fixing your problem.



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