756 Engine Swap

I have a 756 with the 310 German diesel. Its seeping coolant in the oil from the sleeve seals I think. Its also getting alot harder than it should be to start with oil pressure on the low side. I found a 715 combine 310 engine with low hours for about what a piston and sleeve set would cost for my 310. A total overhaul for my 310 with parts and machineing done right by myself could easily run $6000 to $8000. I have been searching the YT archives and the general leaning of the postings is everything will swap and bolt in except the flywheel. CB ONT installed a D310 combine engine in a 756 gas but did not state what he did to make a flywheel work. Has anyone done this swap and knows what it would take to make it work? Remachine the 756 flywheel or remachine the combine flywheel? Adapter hub? I have not seen the combine engine so I don't know what the crank hub looks like.

Use the tractor flywheel The crankshafts are the same.

you will have to change the oil pan also.

The 715 crankshaft has its own part number. All other 310's use the same PN crank. Have you bolted a tractor flywheel on a combine crank? Reason I ask is if I buy the combine engine and the flywheel won't work then I'am stuck with the engine. I know I will have to swap the oil pan, oil pump, rear plate and maybe the balancer.

IF I REMEMBER from 15 years ago when I put a 715 diesel engine in my 756 gas, I am sure the flywheel bolted right on.

If Your existing 756 tractor has a 310 german the tractor flywheel will fit on the combime engine.
You will also have to swap the filter bracket from the tractor to the combine engine. The combine filter bracket interferes with the tractor engine rails. Since the oil pump does not conect to this bracket on the on a combine engine. You need to make up a cross over junper tube oil line on the from of the tractor filter bracket.

Now the oil pan and oil pump will not be the same. The combine has a flat bottom oil pan with the oil pump mounted inside the engine near the front of the engine, the tractor has a stepped oil pan with the oil pump mounted on the right side front cover.
Also the combine oil pan is too deep for the front axle bracket on tractor. I had to fabricated this bracket so it would go around the combine oil pan. On a narrow front end tractor this would not be a proplem since they do not have this ball joint bracket.

Your swap should be easier than a swapping from gas to a 310 diesel. I hand to shorten and drill the rails change out the rad and make up the air filter bracket. On thing i had to go by was we also have an 826 with a 358 german diesel in it, same frame and same engine block.

Good luck

Thanks for the reply CB. Since the block is the same I think I will put the external oil pump and filter bracket off my engine on the combine engine. Since the combine engine pump feeds oil from the pump thru the block port that the tractor engine uses as a pickup port I will just have to swap the pickup and oil pan and I should be good to go. My main concern was the flywheel as some people say it will work and some say not. Just wanted to hear from someone that knew for sure because they did it before. Thanks again!

(quoted from post at 09:00:53 07/20/08)
...... On thing i had to go by was we also have an 826 with a 358 german diesel in it, same frame and same engine block.

Good luck

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The 358 block is actually a little taller than the 310. Same basic design though.

NO. The 358 has a longer stroke crank than the 310 and I thing a shorter conecting rod or the same conecting rod and the wrist pin hole is moved up on the piston, block and head are identical. They only tool up one time to machine the blocks and heads thay way.

Similar to the d/dt414, d/dt436, & the d/dt466 the block and heads are all the same.

I mesure this up if when I did the swap over. If I find a 358 some day I will rebuild it and have a spare engine for both tractor's.

Thanks and have a good day