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Repowering a Bobcat 225 from Onan gas to Onan diesel

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  • tttahoe1
    started a topic Repowering a Bobcat 225 from Onan gas to Onan diesel

    Repowering a Bobcat 225 from Onan gas to Onan diesel

    Team,

    First post on this site.

    Probably should have thought of this site before I ever started down the road of this project.

    Fast pass: I traded myself into a Bobcat 225 that I knew had sat out in the weather. The air cleaner was non-existent, which meant that the Onan Performer engine was going to need some love.

    After checking on rebuild kits for the Performer, I tripped across a freshly refurbished 2 cylinder Onan diesel. Some guy had purchased a bunch of them from military surplus auction.

    Rotation of the diesel is correct for the Bobcat.

    I have yet to separate the Onan gas engine from the generation unit as it appears I need to pull both as a unit from the Bobcat frame and then remove the loooooong bolts that run from front of generation/power unit, through the back and into the Onan Performer.

    Although I am partial to diesel power, if the consensus is to stick with the Onan gas engine - I will whole heartedly listen. I am not interested in creating the next Batmobile - just looking to get this welder running.

    If gas: any recommendations for affordable rebuild kits on the Onan Performer?

    If diesel: any guidance/recommendations on how to come off the flywheel of the Onan diesel and connect to the power unit?

    From what I have briefly read, the Onan Performer has a tapered snout shaft that runs off "front" of engine.

    Under the statement that: Anything can be accomplished with enough money and time.......................I am - unfortunately - a little short on both right now. Any insight on best path from point A to running welder - would be great.

    Thanks in advance.

  • Swimmerboy2112
    replied
    Originally posted by weldonwelding View Post
    This is what I was thinking when he first posted this thread. But I found out that the smaller diesel engine drives are a high speed diesel where the larger machines are low speed. They do also mention that the high speed diesel's do not have the long lifetime like the low speeds but do last longer than gas drives.
    Thats pretty interesting. I'd like to see him try this then. It would be a neat project. If it works, maybe I'll start looking for an engine drive with a bad motor lol

    Leave a comment:


  • weldonwelding
    replied
    Originally posted by tttahoe1:304621
    null
    There is a miller certified shop around here (Seaford Delaware) called Warren electric. Look them up, call em and ask for big Mickey. This dude is an old timer that really knows his stuff about welders, he's been doing it a really long time. I guarantee he will show interest in what your doing and guide you in the right direction.

    Leave a comment:


  • weldonwelding
    replied
    Originally posted by Swimmerboy2112:305053
    I don't see this working.

    An engine driven welder must have the engine rpms at a precise speed otherwise weld output will suffer. Usually diesels spin at a much lower rpm than gasoline engines, therefore unless you spin the diesel at high rpms (which could be damaging, I don't know the rated rpms on that particular motor) then output will be substantially limited.

    If you want to run something other than gasoline, there are companies that make propane conversion kits.

    -Brian
    This is what I was thinking when he first posted this thread. But I found out that the smaller diesel engine drives are a high speed diesel where the larger machines are low speed. They do also mention that the high speed diesel's do not have the long lifetime like the low speeds but do last longer than gas drives.

    Leave a comment:


  • Swimmerboy2112
    replied
    I don't see this working.

    An engine driven welder must have the engine rpms at a precise speed otherwise weld output will suffer. Usually diesels spin at a much lower rpm than gasoline engines, therefore unless you spin the diesel at high rpms (which could be damaging, I don't know the rated rpms on that particular motor) then output will be substantially limited.

    If you want to run something other than gasoline, there are companies that make propane conversion kits.

    -Brian

    Leave a comment:


  • FusionKing
    replied
    Oh I think it sounds like a great project.....if you're smart enuff to make it work!
    But I'm thinkin' that the taper on the crankshaft will pretty much stop you cold in your tracks. Unless your diesel has that taper as well.

    Leave a comment:


  • Miller Welders
    replied
    Our Engine Drive department wanted to reach out with this advice as well -

    While Miller doesn’t supply or sell rebuilding kits for engines, we would recommend referencing the following website or calling Cummins directly at 763-574-5000.

    http://www.cumminsonan.com/

    There is a lot of engineering and testing that goes into pairing generators to engines. One has to consider heating/cooling, vibrations, fuel delivery, fuel tanks, transportation, regulations, etc. There are too many dynamics here for us to make those recommendations. Sorry.

    Leave a comment:


  • Kpack
    replied
    I'm not a expert like these guys but I had a bobcat with the performer engine one time and if I was going to try something like you want to do I would go to somebody that works on welders I'm lucky I have a older man close to me I can get advise from or major work done and he keeps a lot of old welders for parts i read read this site for small repair and enjoyment

    Leave a comment:


  • Cgotto6
    replied
    No harm done, especially after apologizing. I think members don't like when people come around here for one question and expect to get all of their answers immediately. This is a great resource, and we all want it to stick around for many more years to come. The search function if the forum works really well too. You may find good info on the gas engine in your bobcat, as that seems the most cost and time efficient route for you. Good luck getting it going!

    Leave a comment:


  • tttahoe1
    replied
    Originally posted by Miller Welders View Post
    ttahoe1,

    We do read every post on the Forums every day, but if you require a response from Miller, it’s best to contact customer service directly. You can reach them by phone (920 734 9821) or email through the Contact form located here: http://www.millerwelds.com/service/contactus.html.

    Although we do jump in on the Forums from time to time, their main purpose is to provide a place for members to connect with each other.
    Thank you for the reply. As mentioned a minute ago - apologies. I guess I was feeling lonely.

    Leave a comment:


  • tttahoe1
    replied
    ..............and just like THAT - I get 13 replies.

    Most of which were kickin' me around, but that is alright. Probably deserved on my part.

    I appreciate the guidance and probably should have just called the tech line.

    Apologies to anyone I offended - including Miller.

    Leave a comment:


  • cruizer
    replied
    Originally posted by tttahoe1 View Post
    Team Miller,

    Surprising to me that a forum sponsored by the company and part of your website - isn't monitored by company personnel.

    My post/request has had 225 views. NOBODY from Miller spends time on this site?

    I could understand if it was an obscure welding forum - but my question was about a Miller welder.........posted on the Miller sponsored forum.

    Comment in any direction you want - just comment.

    I've got an old Lincoln tombstone arc welder. Perhaps I will see if I get any better response from the Lincoln team when I request help from them.

    When y'all are in your corporate meetings trying to figure out how to improve brand loyalty - may I suggest a discussion around replying to customers asking for help? I guarantee you it will go a long way. I am positive that you can find some consulting firms that will teach you how to say "hello" to a customer.......in exchange for a lot of money.

    Thank you so very much. My experience was great.

    OK, as a Miller CST tech, your idea is Foolish and economically unwise. The time and cost that you will spend in a machine shop getting it "just right" will be huge. And yes lots of people look at the posts, some may help if they can, and some will ponder this idea as strange as it is. Remember that not everyone is tech.

    I don't visit here everyday. I have to work for a living....

    Leave a comment:


  • Kpack
    replied
    I can't believe you ask such a question when that's not done much and then belly ach about about nobody getting involved and then get the moderator involved this is a great site don't mess it up . Do a Search for the the Lincoln site you may be there awhile good luck and good riddance . I just found out the other day what a troll is.

    Leave a comment:


  • aametalmaster
    replied
    Originally posted by tttahoe1 View Post

    I've got an old Lincoln tombstone arc welder. Perhaps I will see if I get any better response from the Lincoln team when I request help from them.
    Yup the Lincoln forum is ready and waiting ...Bob

    Leave a comment:


  • Miller Welders
    replied
    ttahoe1,

    We do read every post on the Forums every day, but if you require a response from Miller, it’s best to contact customer service directly. You can reach them by phone (920 734 9821) or email through the Contact form located here: http://www.millerwelds.com/service/contactus.html.

    Although we do jump in on the Forums from time to time, their main purpose is to provide a place for members to connect with each other.

    Leave a comment:

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