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Discussion Starter #1
What modifications (if any) will have to be made when putting a 2007 420 engine in a 2011 420? Both are 4x4 manual shift engines. Thanks


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Discussion Starter #3
I think there may be some differences in the rear, where the drive shaft goes into the motor but I'm wondering if I can keep those internal parts from the 2011 and put them in the 2007 to make it work


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On sites like partzilla.com you can go into a certain year and model, blast your way down to an individual part, and it will tell you every other year and model that use the exact same part so you can know if they are direct swaps or not. Here it's showing the transmission main shaft is the same for all: 23211-HP5-601 MAINSHAFT (14T/17T) $123.81
 

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Discussion Starter #6
I'd be willing to bet any differences would be very minor.


I think it's just a few internal parts that I can swap in the transfer case (I'm using automobile terminology here, right or wrong).


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Not sure exactly but from what I've been told, Honda changed a few part in there from the 07/ 08 models to the 09/ 11 models that supposedly gave the engine some performance changes. I was in a rush when the guy was explaining it to me so I was half paying attention and his description was vague at best so that's why I came here to the gurus to see if you all may have a more in-depth knowledge


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About the only difference I could see would be electrical plug variations differing between the years, easily remedied with a soldering iron.

comparing pictures of the '07-'08 engines to the '09-'11 engines I do not see any difference in motor mounts so I would say you are good to go.
 

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There was a few running changes through production, I know the top ends changed a little bit and t he cranks part number changed at some point. But as far as interchangeability of the two motors as an assembly I think your fine.


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It will probably bolt right in.

I've redone a few 420's and swapped later/ earlier parts around. They had minor changes but were all interchangeable.
 

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Discussion Starter #14
I'll post up once I've got the skinny on the proper adjustments needed. Thanks to all who have offered their insights.


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Discussion Starter #15
Ok, so what needed to be taken out of my original 2011 engine and put into the 2007 engine that went in was the flywheel. Swapped them out, took it out to the deer lease and she purrs like a kitten. Now that I have a smooth running engine, I was able to hear what I think are bad bearings on the rear axle. Will be getting into that next week but I think (hope) that I'm on the tail end of all the repairs. Fingers crossed....


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How long did it take you to figure that out? I'm impressed.

Swapping out flywheels isn't something most people, including me, would probably think of.
 

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Discussion Starter #17
Lol... I can't take credit for that one. Neither can the guy who did the swap. A guy who's been a Honda specific mechanic for ages just happened to be at the shop when we were swapping the engines and noticed what was going on.


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