Current thoughts on buying OMC “universal coils?

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  • amuller

    US Member - 1 Year
    Replies: 1001
    Topics: 153
    #208415

    I’m redoing the ignition work on a 1962 5.5 because the coils appear to be crap. This is from what I posted on the facebook page:

    “No noticeable spark but runs poorly. Coil secondary 4.62 k ohms upper (low?) and open on lower. I replaced these coils a couple of years ago and used new wires. Probably bought from Amazon. They are black plastic and marked 583249 and 18GZ-OA. So I can pretty much only conclude that these were bad coils. Any thoughts?”

    So where should I be buying coils? The price seems to have crept up noticeably and I don’t know where to get the German-made ones. How is Sierra quality these days? I’m too old and lazy to want to be doing jobs over again trying to save a few bucks….

    Thanks for any thoughts.


    bobw

    US Member - 1 Year
    Replies: 1413
    Topics: 46
    #208425

    I’ve typically bought OMC/BRP coils from Marine Engine. Never had any problems with them. The German made Prufrex coils went out of production several years ago but you can sometimes find some for sale on Ebay. Haven’t tried the Sierra coils but I’ve read that fitment can sometimes be problematic.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20
    1957 Evinrude Fastwin 18

    "Every 20 minute job is only a broken bolt away from a 3-day project."


    crosbyman

    Canada Member - 2 Years
    Replies: 2132
    Topics: 228
    #208432

    I have only used cheapies on EBAY with no issues yet … not one bad coil physically or electrically

    Joining AOMCI has priviledges 🙂


    David Bartlett

    US Member - 2 Years
    Replies: 504
    Topics: 20
    #208438

    BRP for me as long as I can get them!

    David Bartlett
    Pine Tree Boating Club Chapter

    "I don't fully understand everything I know!"


    The Boat House


    Replies: 3403
    Topics: 85
    #208443

    You're only as smart as the person you're talking to.


    amuller

    US Member - 1 Year
    Replies: 1001
    Topics: 153
    #208448

    I took some condensers out of a ’69 25 hp Evinrude. They are 581419 and measure about .565 mfd. I’ve not seen these before and that seems like a high value for an ignition condenser. Anybody know what these are supposed to go in and what the capacitance is supposed to be?

    Thanks.


    amuller

    US Member - 1 Year
    Replies: 1001
    Topics: 153
    #208450

    This has been one of those days when everything I touch is bad or goes bad. Took two German coils out of a motor that was incomplete but running. One has a secondary resistance of 27 k and the other 240 k. No cracks, no exposure to moisture….. No spark, no spark, no spark….Grrrrr


    Steve D


    Replies: 574
    Topics: 57
    #208455

    I took some condensers out of a ’69 25 hp Evinrude. They are 581419 and measure about .565 mfd. I’ve not seen these before and that seems like a high value for an ignition condenser. Anybody know what these are supposed to go in and what the capacitance is supposed to be?

    Thanks.

    I don’t know about the capacitance but those are the right ones for that motor. 581419 is part of Tune Up Kit 172523. This is the application chart on the back of the kit, not sure if the condenser is used on any other motors not listed.

    172523-581419

    Attachments:

    amuller

    US Member - 1 Year
    Replies: 1001
    Topics: 153
    #208461

    Thanks. My Fluke meter can report capacitance, but I don’t think it’s a test under the higher voltage of operating conditions. And the reading of .565 mfd seems suspicious to me. So many condenser numbers and so few specs! Always more to learn….


    billw

    US Member - 2 Years
    Replies: 1485
    Topics: 45
    #208465

    If you can’t do a true leakage test on a condenser, then just assume it needs to be replaced. Anything else is just Christian Science.

    Long live American manufacturing!


    amuller

    US Member - 1 Year
    Replies: 1001
    Topics: 153
    #208475

    We used to change points and condensers on cars, etc, as a matter of course. But with prices up, and quality down, it’s no longer so obvious what to do….


    jeff-register


    Replies: 1279
    Topics: 49
    #208476

    It may be the case of an open in the secondary winding only connected by carbon. Carbon is used for resistors. Look very closely at the outside of the coil for a pin sized hole where it arced to ground from running without the plug wire connected. You make energy & if it has no where to go, it finds it’s own way. I could look up the cap but my book was loaned out but it was forever.


    Mumbles

    Canada Member - 2 Years
    Replies: 4940
    Topics: 268
    #208481

    The 581419 caps were used to compliment the original 580197 coils used in the motors shown. The more common 580321 cap is used with the more common 584477 coils which were used in just about everything else OMC built. Since the offshore coils are meant to replace the 584477 coils, go with the lower uF rated 580321 cap if you are replacing the coils. I know the coils look the same, but they are different.


    amuller

    US Member - 1 Year
    Replies: 1001
    Topics: 153
    #208493

    It may be the case of an open in the secondary winding only connected by carbon. Carbon is used for resistors. Look very closely at the outside of the coil for a pin sized hole where it arced to ground from running without the plug wire connected. You make energy & if it has no where to go, it finds it’s own way. I could look up the cap but my book was loaned out but it was forever.

    That is more or less what I’d expect, except that these coils have been in my shop and not abused by running disconnected. Supposedly these are premium quality German coils. So…..? I’m starting to wonder if there is a lot of bogus product out there.


    amuller

    US Member - 1 Year
    Replies: 1001
    Topics: 153
    #208494

    The 581419 caps were used to compliment the original 580197 coils used in the motors shown. The more common 580321 cap is used with the more common 584477 coils which were used in just about everything else OMC built. Since the offshore coils are meant to replace the 584477 coils, go with the lower uF rated 580321 cap if you are replacing the coils. I know the coils look the same, but they are different.

    So is there any real difference in the performance of the coils? Or differences in the way the stator plate and flywheel magnets are set up? I see these listed are higher performance motors. So would using these coils on my low-performance 5.5 be a factor in the marginal spark i’m getting?

    How did this get so complicated?

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