6620 engine into a 4640,,, May 22, 2013 12:58PM
Hello, Can a JD 466 out of a 6620 combine be installed in a 4640? I don't know what style engine either one is yet. Don't know if cam or crank driven oil pump.

Friends picked up a 4640 with a bad engine. Flywheel was run loose until it broke all the bolts and has a big crack in the block corner where it bolts to clutch housing.
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Re: 6620 engine into a 4640,,, May 22, 2013 02:04PM
yes it will bolt right in ,you will want to change the oil pan and the exhaust manifold and probably a few other miner changes ,put them side by side on the floor ,but yes the bolt patterns are the same been there done it, good luck.
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Re: 6620 engine into a 4640,,, May 22, 2013 02:23PM
Make sure to check combine block for a tach drive. If it is a titan 2 block it might not have a mechanical tach drive hookup. I put one in my 4630 and had to put a 4450 analog tach in the dash and build a wiring harness to hook up to the cam sensor.
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Re: 6620 engine into a 4640,,, May 22, 2013 02:29PM
there is one small difference in the blocks at the front where the 4 bolts hold the block to the frame rail there may be different spacings on that bolt pattern if your combine doner engine is say 82 or older i think there be no problem .... then change was made in 50 series production i think so a later model combine may have a different bolt pattern ..there is a difference in the tach drive there are two one for a crank driven oil pump with two gears on it and one with only one gear
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Re: 6620 engine into a 4640,,, May 22, 2013 04:35PM
The bolt pattern is different between an early 6620 and a titan 2. The frame rails can be drilled out for the bigger holes. If you have any questions e-mail me.
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Re: 6620 engine into a 4640,,, May 24, 2013 09:20AM
Thanks for all the info. It sounds like they found a 6620 engine. Have to go and check it out.
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Re: 6620 engine into a 4640,,, May 28, 2013 01:47PM
Well they got a 6620 engine from what I was told was a titan II. It has the sensor in the timing cover but had a plate over the hole for the cable tach drive. Cam driven oil pump. So the cable tach drive cover bolted on all right.

The problem we ran into is the 4640 engine has the larger bolts in a bigger bolt pattern at the front of the block where it bolts into the frame rails. The 6620 engine has the smaller bolts in a smaller pattern. One hole in the front of the frame lines up with the 6620 engine.

Any one else run into this before? How did you deal with it?
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Re: 6620 engine into a 4640,,, May 28, 2013 03:29PM
Are you sure it's a cam driven oil pump? Later engines used the same cam but just to run the tach drive but crank driven oil pump.. Sounds like the engine is a later engine with the smaller bolt pattern.. I don't know if anyone is make a mounting plate.. But you can make plate to fit the new engine and cut out the old one.. If it was a small frame tractor you can swap the frame rails to a later style to match your engine.. But I'm not sure what will be the same as a 4640..
Bryan
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Re: 6620 engine into a 4640,,, May 28, 2013 04:19PM
Yes both engines have cam driven oil pumps. I am the one who put the tractor pan on the combine engine. Had to change cover on the oil pump also because tractor pan is deeper than combine pan.
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Re: 6620 engine into a 4640,,, May 29, 2013 01:19PM
I was told now the engine was not from a titan II. I got frame rails modified today. Turned out nice. I looked at their 4440 and 4630, both had small bolt pattern and small bolts. Most be just the larger 40 series had the bigger bolts.
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Re: 6620 engine into a 4640,,, June 10, 2013 07:01PM
We finally got the 4640 running. Took a while to find a good used flywheel. The one that came with the tractor had been run loose so it was junk. It is a quad range transmission, Trans seems to work fine.

We left the combine injection pump on it, it don't have airanoid {spelling} valve and throttle lever is on the outside of the pump, just had to bend the throttle linkage a little to hook it up. We left the combine pump on because the engine ran real nice in the combine and don't know what shape the pump and injectors are in from the original tractor engine. We did put the intercooler on the combine engine though.

Lots of electrical stuff to fix on it. It also has hydraulic front wheel drive that don't work, have to look into that. I think the solenoids on top of the pfwd control valve are junk.

Also the air conditioning is a mess. Needs new lines, some are rusted real bad. Lots of rust and junk inside the lines also so not sure what else will need to be changed to get the air working. We used the compressor from the combine since it was clean inside and had been working.


Tom
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Re: 6620 engine into a 4640,,, August 15, 2020 03:28AM
Can you swap a 466 with a 404cu” into a JD4630?
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