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#1 IH Forever

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Posted 02 December 2011 - 08:19 AM

I'd like to add a 686 to my collection sometime in the future as I helped for a farmer when I was in high school that had one and I always really likeed it. I've been looking around tyring to see what's available and have noticed a coupe for sale that say they have the D312. I always thought they all had the D310. Where some made with the 312?
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#2 Nebraska Cowman

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Posted 02 December 2011 - 08:46 AM

I thought all the 86 series had the 312. I had a 666 and it had the 312. It's a good engine but noisy. I currently have that engine in an 86 Hydro. I know nothing about the 310. Is that the German engine?

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#3 IH Forever

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Posted 02 December 2011 - 08:58 AM

I thought all the 86 series had the 312. I had a 666 and it had the 312. It's a good engine but noisy. I currently have that engine in an 86 Hydro. I know nothing about the 310. Is that the German engine?


Yes, that is a German, same engine as in the 756.
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#4 Matt Kirsch

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Posted 02 December 2011 - 10:16 AM

AFAIK, the 686 always had the American D312.

The 686 was only made during the first part of '86 series production.

IH discontinued the 686 in early 1980, replacing it with the 786, which uses the D358 German diesel engine.

IH used the German engines because they had a bunch of them stockpiled and they needed the manufacturing capacity to build DT466's for trucks.

#5 FarmallFan

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Posted 02 December 2011 - 10:29 AM

I think it was 1979 when the 312 was replaced with the 310 German.
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#6 IH Forever

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Posted 02 December 2011 - 11:49 AM

AFAIK, the 686 always had the American D312.

The 686 was only made during the first part of '86 series production.

IH discontinued the 686 in early 1980, replacing it with the 786, which uses the D358 German diesel engine.

IH used the German engines because they had a bunch of them stockpiled and they needed the manufacturing capacity to build DT466's for trucks.


They definately used the D310 in some. The one I drove as a kid had it and looking on tractor house many have it. Until I started looking recently I just assumed they all used that.
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#7 Injpumped

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Posted 02 December 2011 - 12:28 PM

tractor data covers this very nicely.

#8 Dr. EVIL

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Posted 02 December 2011 - 12:34 PM

MATT - I wouldn't say IH had the Nuess engines "Stockpiled", they (Nuess) shipped containers of engines every month to FARMALL. But I'd agree that Melrose needed capacity for the 400-series to meet demands of Ag & truck divisions. Both ag & medium duty trucks were having good sales about that time.

#9 international3088MFD

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Posted 02 December 2011 - 04:03 PM

our 686 has the D310. has 6500 hours, engine is tight, no leaks. its excellent on fuel. and never knows when to stop pulling. neighbor has one with the D312 and its a hard starting beast. typical german engine.

WEGMAN FARMS: 325 acres of corn, beans, oats and alfalfa crop rotation.
80 cow Holstein milking operation.


Tractors on the Farm: Case IH MX Magnum 200, MX Magnum 180, McCormick MTX 135, Case IH MX 110, IH 686 D312 diesel, Farmall DX55, Farmall Super M, stage II, Case 650 dozer. IH 1420 combine. Run Red

My Tractors: 1972 IH 1066, 1957 Farmall 350, 1950 Farmall H, Cub Cadet 100, Cub Cadet 682. Cub Cadet 149, 1951 Massey Harris 44, 350 V-8 conversion tractor.

SEARCHING FOR: International 966 Diesel. Serial number: 29192
Gone but not forgotten: International 3088 open station w/ Elwood MFD

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#10 George 2

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Posted 02 December 2011 - 05:54 PM

1977 and 1978 model 686 had D312. 1979 and 1980 models had the D310 engine. Both were good engines. I have seen d312's with 8000 and 9000 hours on them and never been opened up.



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