All-Terrain Lawn Tractor Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.

All-Terrain Lawn Tractor Forum

Like riding lawn tractors through mud, woods, rocks, and snow? Then this is the place for you! Share your ideas, Post your projects and more!
 
PortalHomeSearchRegisterLog inBuild-OffTop Tractor Challenge
Welcome to the All Terrain Lawn Tractor Forum! . . .
Site under minor construction...
No 2021 Build-Off. Will return in 2022. Stay tuned later this year for rule changes!

 

 John Deere 400 - 26hp Diesel Swap

Go down 
3 posters
AuthorMessage
TightWad
Forum Newbie
Forum Newbie


Join date : 2021-09-08
Posts : 4
Forum Rep : 0

John Deere 400 - 26hp Diesel Swap Empty
PostSubject: John Deere 400 - 26hp Diesel Swap   John Deere 400 - 26hp Diesel Swap Icon_minitimeSat Sep 11, 2021 11:50 pm

Hi Everybody,

Over the last year I've really got into working on and tinkering with mowers. I have a 317 and a 330 with a 16hp yanmar diesel. My old man has a 455 with a 22hp yanmar. We are both big fans of the yanmar 3-cylinder diesels.

I picked up an old dilapidated John Deere 400 a few months back for $350. I knew there was something wrong in/with the engine, but since it came with a hydraulic plow I decided to buy it. A mower dealer had it sitting on their back lot for a few weeks and wanted to get rid of it. My original plan was to tear into the motor to find out why the driveshaft would turn freely with no compression. I initially thought it could be stripped timing gears. After pulling off the heads and finding no movement of the pistons, it sounded like both rods were broken.

I decided that the project was worthy of attempting an engine swap on. I started looking for a 20+ hp horizontal shaft motor to stick in. Repowers on these 400s are common and typically not very involved. My love of yanmars took over when I saw a JD 3215a fairway mower come up on marketplace I decided it would be the donor. After some preliminary research, I determined that it would have a yanmar with 25-29hp. I drove 2 hours to pick it up and barely squeezed it on the trailer.

The engine fired up instantly every time I went to start it and sounded perfectly healthy. The machine only had 1200 hours on it, and the hour meter was still functioning. The guy I bought it from had purchased 3 fairway mowers off a golf course to resell. I picked this one up for $1200 and felt like the motor alone was easily worth that much.

I began pulling the yanmar out of the 3215a. It came out without too much trouble, however it was readily apparent how much of a pig it was after getting it out and onto the garage floor. Reading through the service manual, it appears my engine is 26hp. After pulling the yanmar, I went back to the 400 and stripped it down the basically the frame, transmission, and hydraulics.

Ultimately, this engine swap is going to require serious modifications to the front end. I had to machine an adapter to mount the factory PTO sheave to the new engine. I had to make motor mounts and mounting brackets from scratch and weld them to the frame. Tonight I cut out a piece of 5/8in plate on the bandsaw and will start machining an adapter for the drive shaft from the back of the motor to the transmission. I am also working on shortening the driveshaft.

I will also need to modify the steering column side panels, the hood likely will not fit anymore so I will have to make a new one. I will have to mount the radiator and oil cooler off the front end of the frame. Hydraulic inlet and return lines for the oil cooler will have to be lengthened. The battery will be mounted transverse to the steering column. I am going to use the 3215a wiring harness for all of the electricals. And I'm sure there are plenty of other things that I am not yet aware of.

I have made a good bit of progress on this project and have committed to seeing it through to completion. I have filmed the entire process and have 4 videos edited up so far. I am currently working on the 5th. Since I spent all of that time filming I did not take a lot of photos. I have added some of the photos below.

I will add links to my videos after my 7 day new member probation is up.

John Deere 400 - 26hp Diesel Swap 20210812

John Deere 400 - 26hp Diesel Swap 20210811

John Deere 400 - 26hp Diesel Swap 20210810

John Deere 400 - 26hp Diesel Swap 20210814

John Deere 400 - 26hp Diesel Swap 20210813

John Deere 400 - 26hp Diesel Swap 20210910

John Deere 400 - 26hp Diesel Swap 20210913

John Deere 400 - 26hp Diesel Swap 20210912

John Deere 400 - 26hp Diesel Swap 20210911

MightyRaze and Nevadablue like this post

Back to top Go down
MightyRaze
Administrator
Administrator
MightyRaze

Age : 46
Join date : 2016-09-06
Posts : 7421
Forum Rep : 546
Location : Central Oklahoma

John Deere 400 - 26hp Diesel Swap Empty
PostSubject: Re: John Deere 400 - 26hp Diesel Swap   John Deere 400 - 26hp Diesel Swap Icon_minitimeSun Sep 12, 2021 12:09 am

If your videos are on YouTube. Use the YouTube button to embed them!

_______________________________________________
Modified Tractors:
Li'l Red 89 Murray Widebody
Kal-El 82 Murray GT
TheGreenMachine - "coming 2022"
Have a question? Ask me! Type in "@MightyRaze" in your post!
Back to top Go down
TightWad
Forum Newbie
Forum Newbie


Join date : 2021-09-08
Posts : 4
Forum Rep : 0

John Deere 400 - 26hp Diesel Swap Empty
PostSubject: Re: John Deere 400 - 26hp Diesel Swap   John Deere 400 - 26hp Diesel Swap Icon_minitimeSun Sep 12, 2021 12:22 am

Part 1 - The examination and diagnosis

Part 2 - Pulling the diesel

Part 3 - Adapting the front PTO pulley

Part 4 - Motor mounts and bracketry
Back to top Go down
Rustbucket Garage
Monkey Wrench
Monkey Wrench
Rustbucket Garage

Join date : 2021-01-15
Posts : 553
Forum Rep : 32
Location : Upstate New York

John Deere 400 - 26hp Diesel Swap Empty
PostSubject: Re: John Deere 400 - 26hp Diesel Swap   John Deere 400 - 26hp Diesel Swap Icon_minitimeMon Sep 13, 2021 2:41 pm

Neat build, I’ll be following this closely. Going to do a restoration or just a repower?
Back to top Go down
TightWad
Forum Newbie
Forum Newbie


Join date : 2021-09-08
Posts : 4
Forum Rep : 0

John Deere 400 - 26hp Diesel Swap Empty
PostSubject: Re: John Deere 400 - 26hp Diesel Swap   John Deere 400 - 26hp Diesel Swap Icon_minitimeMon Sep 13, 2021 9:49 pm

@Rustbucket Garage wrote:
Neat build, I’ll be following this closely. Going to do a restoration or just a repower?

I just want to repower it and hopefully have a good, reliable, overpowered mower with a 60in deck. lol

I got quite a bit done on the rear crank pulley-to-driveshaft adapter. From the last picture of my first post where I roughed out the shape on the bandsaw, to where it stands now.
John Deere 400 - 26hp Diesel Swap 20210914

John Deere 400 - 26hp Diesel Swap 20210915

John Deere 400 - 26hp Diesel Swap Snapch10

All that's left to do now on it is to mill a keyway for a 1/4in woodruff key and then drill through 90 degrees from the key to add in a roll pin. After I get it finished I will mock up the engine and cut the drive shaft down to the correct length.

Nevadablue likes this post

Back to top Go down
Sponsored content




John Deere 400 - 26hp Diesel Swap Empty
PostSubject: Re: John Deere 400 - 26hp Diesel Swap   John Deere 400 - 26hp Diesel Swap Icon_minitime

Back to top Go down
 
John Deere 400 - 26hp Diesel Swap
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
All-Terrain Lawn Tractor Forum :: Tractor Project Builds :: Utility, Workhorse, and Pulling Tractors-
Jump to: