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  1. #31
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    242

    Default

    One thing I didn't mention is that. It usually bogs down during my welding usually as I'm welding and it hasn't much while grinding.
    Ill look into. The 5" grinders but I love my makita 7" that thing is a beast at removing and cutting metal.
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
    1/2" Aircat impact gun 900#

  2. #32
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,683

    Default

    Engine's getting too hot, so wrong oil, wrong oil filter, toss the green foam element off the air filter, Loosing vacumn to the vacumn fuel pump is all I can come up with right now (as engine is too hot). Perhaps its time to replace the fuel pump, as thats the first thing other than the rest of the stuff I'd be doing. The engine will load up to much if the high idle no load rpm isn't enough. Its a tough one but pretty easy to solve.

    Another culprit is the spark plugs usually the left one that likes to pile.

  3. #33
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    242

    Default

    Thank you cruizer I'm checking everything you mention. Hopefully solves the problem
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
    1/2" Aircat impact gun 900#

  4. #34
    Join Date
    Apr 2009
    Location
    Oswego IL
    Posts
    634

    Default what have u replaced.....

    Quote Originally Posted by eecervantes83 View Post
    One thing I didn't mention is that. It usually bogs down during my welding usually as I'm welding and it hasn't much while grinding.
    Ill look into. The 5" grinders but I love my makita 7" that thing is a beast at removing and cutting metal.
    First have you done your service to it? Service means engine oil and filter. FUEL filter, check and or replacement of air cleaned. Also replace the spark plugs. Now if that is done and you still have a probelm, after it boggs down does it restart easily, or do u have to crank, and crank? ...there are 3 possible probelms, bad oil pressure sensor(not likely as it would shut off instantly), bad/weak coil as i beleive it is, or fuel delievery probelm. If it is hard to restart, try pour a little gas in the carb, if it fires right up, you have a weak fuel pump, or a broken or leaking pickup tube. If it still does not start its a igntion coil.
    Kevin
    XMT 304
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  5. #35
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,204

    Default

    Is it firing on both cylinders? Those Onans will run on one cylinder up to governed speed but lose it under load. They've been known to break a rod in one cylinder and keep on going.

    With it running, pull one plug wire at a time to see what happens. Use insulated pliers or welding gloves with pliers to keep from getting knocked on your can. If it keeps running with no change in speed/tone that cylinder is dead. If that's what happens, pulling the other wire after replacing the first should kill the engine.

    You could also just pull the plugs and check for compression while cranking it over.
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  6. #36
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    242

    Default

    Problem solved thanks to everyone who gave advice. Bottom line the machine needed a tuneup.
    Spark plugs were shoot . And oil looked dark but ok .oil filter had some really dark oil slush . No metal in oil found. It still pops the breakers tho.
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
    1/2" Aircat impact gun 900#

  7. #37
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,683

    Default

    7" draws too much power, again no rig welders that I know of uses them. Had a feeling that the problem was tuneup related, score another on for me......lol

  8. #38
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    242

    Default

    Not yet cruizer. Still have the problem. It wants to shut off. I found a quick remedy if I pull the choke out it stays on and lets me work. But when I push the choke back in it dies. What's the deal.
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
    1/2" Aircat impact gun 900#

  9. #39
    Join Date
    Feb 2009
    Location
    Lodi, CA
    Posts
    1,263

    Default

    Sounds like you have a vacuum leak somewhere. Either at the intake manifold or the fuel pump (vacuum hose or pump itself, they do go bad sometimes).

    Another thing, as you have an NT, I assume this is the old 90 degree flathead Onan. These do NOT have hydraulic lifters, they are mechanical, and need to be adjusted occasionally to compensate for wear. As Cruiser mentioned way back in this thread, if your RPM drops, voltage goes down and amperage goes up, thus tripping the breaker.

    If you happen to remove your intake manifold to replace gaskets, take a little time to remove the covers off the valve mechanisms, and set everything back to specs.

    I speak from experience, I've been dealing with Onans since the early 70's, when all Onans were still cast-iron blocks. Not welder power, but equipment power. Although they went to aluminum blocks in the 80's, they are still basically the same, and many of the problems are the same.
    Obviously, I'm just a hack-artist, you shouldn't be listening to anything I say .....

  10. #40
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,683

    Default

    Actully quite common in the ONANS to pull the choke out slightly when running., still yes, best to adjust the tappets

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