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  1. #1
    Join Date
    Nov 2013
    Posts
    12

    Default Onan p216g interchangabilty

    ok, I bought a miller bobcat 225g with a onan p216g. I had always wondered why it puked out oil out of the fuel pump. needless to say i found out what was causing it. I found that I had 2 bent intake valves and lost the seat in on of them and as of right now the engine is FUBAR'D as of right now. So here is the million dollar question of the day... The welder is a 1991 model according to MILLER, so I am guessing the engine is a 1990-1992.. I found another p216g with very little run time, but before i do that i was wondering if these engines will swap out or if I am going to run in to problems with the crank mating to the generator...
    Last edited by ethandg; 01-31-2014 at 06:19 PM.

  2. #2
    Join Date
    Jan 2014
    Location
    Northern West Virginia
    Posts
    37

    Default Don't take my word on this but check it out

    I believe that engines that are designated for use with generators usually have tapered shafts whereas other engines use straight shafts. See which yours has and limit your search to them. Also, and once again this is just my understanding so you'll have to check it out yourself, but I think the mounting holes and bolt patterns are more or less universal for various sized engine platforms and generators, so you may not even have to limit yourself to the original brand and model of engine if you are getting one of about the same horsepower.

    And with that said I wish you all the luck in the world finding a 20+ year old used engine in good repair.

  3. #3
    Join Date
    Nov 2013
    Posts
    12

    Default called cummin/onan

    I found out today that for that engine there was 11 different crankshafts, I don't know if they are generational or by application. But I guess the only way I am going to find out is to get the full numbers off of both engines and run them to see if they are interchangeable. And you do bring up some good points as far as mounting. I have heard that some later model p216 in a miller application were threaded.

  4. #4
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,854

    Default

    Maybe change the title in your thread to reflect your question. Something like Onan P216g interchangeability.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  5. #5
    Join Date
    Nov 2013
    Posts
    12

    Default Thread title

    Noted sir!!! Didn't even think of that!

  6. #6
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,834

    Default

    Old engine has a code on the data plate, the new engine must have the same code

  7. #7
    Join Date
    Nov 2013
    Posts
    12

    Default data plate

    So the data plate on the engine has to match character for character?? So if that is correct I need to find a 20+ year old engine with low hours? Or drop about 1500.00 on a new engine?

    I wouldn't think there would be THAT much variance in crankshafts, with the exception of narrow taper, wide taper and threaded.

  8. #8
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,834

    Default

    Lots of variations, thats why the engines have a specific code

  9. #9
    Join Date
    Sep 2009
    Location
    Canada
    Posts
    185

    Default

    Have you looked into the cost of overhauling your engine?
    New valves, guides, springs, cam shaft etc.
    Lincoln Idealarc 250 stick/tig
    Miller Bluestar 2E
    Thermal Dynamics Cutmaster 52
    Torchmate CNC table

    Ironworker Welder
    Operating engineer
    Owner/Operator Devlin Metal Works
    Custom CNC Plasma Cutting and Welding

  10. #10
    Join Date
    Nov 2013
    Posts
    12

    Default engines

    Cruizer, I found that out when I called Cummins/Onan, lol. I could not believe how many variations there were!!! But I reckon all I can do is get the numbers and run them.

    Snoeproe, I was told by my mechanic that between machining and rebuilding it I would be money ahead to just buy a new one, because the valve seats would have to be oversized among other things. He also said that if I could find a used one that wasn't wore out that may be my best bet. I don't have a lot of money to blow on a engine and, I found one that would be pretty much just given to me. But it has to be the correct variation of that engine. It is on a small Case lawn tractor.

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