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Discussion Starter #1
I am parting out a 7700 combine. I want to know if this engine is the same that was used in the 4020's? Any info would be great. Thanks, Tom
 

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Yes. It should be a 404 cid engine and that is what was used in 4020s. Check your operator's manual for sure, I recall all 7700s had the 404.
 

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i helped a guy in our shop do this swap, took the engine out of the 7700 and put it in the 4020, only major difference was that the combine had a turbo
 

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Discussion Starter #5
Thanks for the info. I am located in north central Il. I have a friend that has a 4020 with a spun bearing and was looking for another motor for it. I think he might swap engines and rebuild the original engine at a later time and put it back in. He said he wants to keep the tractor original but money is to tight now.
 

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that reminds me, we had to notch the block on the bell housing for the throttle linkage, also, if the tractor has 2 scv's the exhaust manifold will not fit. we had to cut them apart and weld two pieces together to make it fit
 
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