Repower 706 gas

[nepoweshiekfarmalls]

I spent some time visiting my Uncle over Christmas.  He asked if we had ever done anything with Dad's 706 gas (291 ) tractor.  It has been sitting for many years with a pulled sleeve on a 50 hour overhaul.   

My Uncle was an IH mechanic for many years.  He had an idea that I really like:  repower it with a 407 diesel.  It has the long framerails and hood already.  It would essentially be like an 856 Custom if we installed an 856 engine.  Would this work as well as I think?  Anyone tried this swap?  I appreciate your ideas.   Thanks!

[R190]

you know as well as anybody the availability of good 407 engines. After finding an engine the easy part begins.

[nepoweshiekfarmalls]

I question whether the 407 would fit under the hood.  I was thinking that the radiator housing and dash supports are shorter on the 706.  Would I need an 826 front casting and 806 dash towers?

[nepoweshiekfarmalls]

6 minutes ago, R190 said:

you know as well as anybody the availability of good 407 engines. After finding an engine the easy part begins.

I have a line on a 915 hi profile with a good running 407 in it. 

[HydroTek]

 d-360 would fit in there better than the 407

 

[R190]

lucky dog ,lucky dog

[HydroTek]

wouldn't the 915 have the DT-436 in it ?

[Nebraska1206]

It'll fit, I know of a 706 that has a DT361 in it, was from an 806 that did tractor pulling, the 806 got a DT466, the 706 received the old 361 pulling engine.  Don't think its exactly 361 cubes anymore, but that's irrelevant.  361 & 407 are the same height.  The overhang on the fuel tank will be your biggest hurdle.

[Nebraska1206]

8 minutes ago, HydroTek said:

wouldn't the 915 have the DT-436 in it ?

915 High-profile s/n 2349 & below could have the DT407.  S/N 2350 & above was the DT414.

[HydroTek]

I have cut the corner out of the tanks
reversed it and welded the corner back in for clearance

[brewcrew]

1 hour ago, nepoweshiekfarmalls said:

I have a line on a 915 hi profile with a good running 407 in it. 

That’s not just a 407, it’s a dt407 with the four roller pump as found in a 1456. (Assuming it is the 407, not the 414). The only downside I could see is if there is not adequate clearance for the turbo.

[supermpuller]

DT 466

[brahamfireman]

A running 407 is worth 5K.... you'll have 7K into a 706.....

Sell it to someone that wants it and but a diesel 806 for 5K and have way less time into it.

[cedar farm]

Find an 806 gas. The 706 uses a shorter steering column. Not much room for things like the air cleaner. Also shorter frame. A 706 is something like 6" shorter. 407 may be to long.

[acem]

How about a D310?

Or SV392...

[stronger800]

He already said it had the longer hood and rails.  (I know nothing of a Gas 706, but I thought the later 706’s were longer…like an 806.)

 I have a turbo  806 and a turbo 856.   Love them.  I look for deals on clean, but in need of repair tractors all the time. If I could find a dead 706 or 806….I’d go straight to a 414/436/466….for parts availability alone.  You have a line in a 407…..but you probably Have dozens of 414’s. 

[nepoweshiekfarmalls]

I want to resurrect my Father's 706.  Just thought I might make it more useful and unique.  Folks would look at it and say:  Wait. They never built one that way!  Plus:  remember where i work, I just wait for the right parts to come along....

[stronger800]

So how many 414’s do you have?  Ive seen guys just cut that whole front section often fuel tank right of. Put a plate over it 

[acem]

I've seen a 706 with a 6BT Cummins (5.9).  A 4BT would probably be good too and different.

How about a V6-71 Detroit?

[nepoweshiekfarmalls]

15 minutes ago, stronger800 said:

So how many 414’s do you have?  Ive seen guys just cut that whole front section often fuel tank right of. Put a plate over it 

My Uncle also suggested a 414 swap.  Probably have 20 or 25 good 414 and 436 engines in combines at work.

[acem]

Where you working?

[nepoweshiekfarmalls]

9 hours ago, acem said:

Where you working?

Been a parts counterman at Colfax Tractor Parts in Iowa for 13 years.  Salvage out tractors and combines.

[Diesel Doctor]

With a torch and a welder, anything will fit!

But the project can get over whelming very quick and not completed.

I am all for fixing the sleeve that is simple and yet to be done.

I believe in the K.I.S.S. theory?

[cumminstinkerer]

@nepoweshiekfarmalls There is a 756 factory non TA not to far from you that I helped a buddy, you  know him I'm sure, put a 5.9 cummins into, that is a wicked tractor! I think I would lean to that or a 400 series swap, 407 is a great engine and can be done, but like has been mentioned spendy to work on! If you wanna stay IH all the way I think a 400 or a 360 would be better, them darn 407 take a lot of work and pricey to do, though if you have a good one available go for it, worst case have to trim the fuel tank and some other minor stuff.  We had American Radiator, I think it was Midwest then, take the whole overhang off the fuel tank on my buddies, it can be done by any good welder, I just didn't have time to mess with it when we were putting it together. I would guess you probably got him some of the parts for that swap! He is just west of 330 and 65 split basically!

[nepoweshiekfarmalls]

2 hours ago, cumminstinkerer said:

@nepoweshiekfarmalls There is a 756 factory non TA not to far from you that I helped a buddy, you  know him I'm sure, put a 5.9 cummins into, that is a wicked tractor! I think I would lean to that or a 400 series swap, 407 is a great engine and can be done, but like has been mentioned spendy to work on! If you wanna stay IH all the way I think a 400 or a 360 would be better, them darn 407 take a lot of work and pricey to do, though if you have a good one available go for it, worst case have to trim the fuel tank and some other minor stuff.  We had American Radiator, I think it was Midwest then, take the whole overhang off the fuel tank on my buddies, it can be done by any good welder, I just didn't have time to mess with it when we were putting it together. I would guess you probably got him some of the parts for that swap! He is just west of 330 and 65 split basically!

Does he still have that 291?