John Deere 655 Turbo Diesel
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Thread: John Deere 655 Turbo Diesel

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    John Deere 655 Turbo Diesel

    Hi Everyone,

    First, huge thanks to duwem for all the texts and advice he's been giving me!

    I finally decided to post up on the forum with my project. I bought a 655 a few years ago, and it never seemed to have enough power. I had read the 655's were a bit of a dog, but I liked the size and what it could do. It was fine for the most part, but still struggled more than I liked, even simply mowing the lawn. I did need to rebuild the engine as soon as I bought it so I went 20-over on the pistons. I now have 26.8 hours on the engine and figured it was about time to give it a little more pep. I didn't want to destroy the reliability so I'm only going for 3-5 psi of boost, just a bit to get around 18-20HP.

    This is how it started:

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    I took a lot of pictures as I was tearing it down, but I apparently don't have one of the complete engine bay fully assembled so this will have to do. The air cleaner mounts sideways across the valve cover. Search Google:

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    I bought a VZ21 turbo off ebay for $130. Its an RHB3 knockoff. I'm slightly nervous about the quality in that I don't want it to shred and take out my rebuilt engine, but I apparently its a risk I'm willing to take. I am relocating the battery to a 'weight box' up front to clear room for the turbo. I want the machine to look stock from the outside but getting rid of the battery was the only way to fit the turbo without a massive headache, and besides, a weight box of front doesn't look out of place and will complement the 160 lbs of weight I already had up there. I guess I do have a pic with the air cleaner:

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    The hinge will be flipped the other way.

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    Since the turbo wouldn't be right off the manifold, I was worried about the tubing holding all that weight so I made a pass-thru bracket to mount the turbo and piping to for a little extra support:

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    With the turbo mocked up, I got to work on fabbing the exhaust piping. Lots of pie cuts:

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    I mocked up where the air cleaner would go (moving up about 3 inches) and got to work on more plumbing (and a more pie cuts):

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    Once I had this all done, I needed to do some testing

    This video is just the turbo hooked up and not touching the fuel":

    John Deere 655 Turbo Diesel Tractor - YouTube

    And this is after I adjusted the fuel:

    https://youtu.be/wUnh9gAMf2Q

    And this is where the project currently stands! More to come!
    Last edited by jdrockin; 09-25-2019 at 11:12 AM. Reason: Pics were goofy

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    PJR832's Avatar
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    That is awesome

    I especially like how the black smoke roles like an old school diesel when throttled up.
    DRobinson, rtgt, BigJim55 and 1 others like this.
    Pat
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    duwem's Avatar
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    Looking good buddy. Here is mine in the 332. Same engine as 655
    Attached Thumbnails Attached Thumbnails 182E6F6C-E9F7-4024-9A58-BAAAB6B48B50_1569429320236.jpeg  
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    Those are just plan cool.
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    Rollin' coal.

    Gonna need to put a DPF on that thing, ...either that, or wear a full face respirator ! =O)
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    johnH123's Avatar
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    Thats awesome! My only question is, is it supposed to smoke like that?
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    i like it a lot now please finish it off the right way---to me that includes stacks--no tractor should be humiliated by not having a stack-right
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    Interesting project! Did you get your engine rebuild parts from Deere? I procured a short block about ten years ago and back then rebuild parts were “scarce”.


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    Quote Originally Posted by johnH123 View Post
    Thats awesome! My only question is, is it supposed to smoke like that?
    In a way, yes it is. The fuel needs to be turned up in order to accommodate the extra airflow from turbo. It smokes like that since the turbo isn't spooled up and providing that extra air when it revs so quickly. If I were to bring the RPM's up slowly, it wouldn't smoke (also why the pulling guys slowly ramp up the revs in order to get the turbo spooled before dumping so much fuel in it kills the machine, or worse).



    Quote Originally Posted by JDeere655 View Post
    Interesting project! Did you get your engine rebuild parts from Deere? I procured a short block about ten years ago and back then rebuild parts were “scarce”.


    Sent from my iPhone using Tapatalk
    I bought many of my parts from Thermo By Products. They are a ThermoKing dealer. Yanmar actually makes a lot of engines for reefers as well, one of which was the 366. 366/3TN66, you get the point. Not all the parts cross, but the main components I needed did, aside from pistons. TBP used to offer kits with the option of .010, .020, and .030 -over pistons. I ordered .030-over, but got a call a day later stating they no longer carried those kits and only had the STD piston size. We worked out a deal where I'd buy a kit, minus piston heads and rings. Forgot the cost. I do remember that I then had to source pistons and rings from Deere, which cost more than the kit (something like $143/piston, and they only offered 0.020-over!!!).



    I appreciate all the comments! I'm not leaning towards stacks since I want the machine to look stock from the outside. Not trying to make some sleeper tractor or something, I just want the stock look and not need to have more exhaust noise coming up top and back at me.
    Last edited by jdrockin; 09-26-2019 at 07:20 PM.
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    Awesome build! I love custom turbo jobs.

    Once everything is squared away you HAVE to put that 655 on a PTO dyno to see how much HP you gained, I bet at least 5-10 hp.
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