sea king ignition

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    wrenchero

    Replies: 34
    Topics: 18
    #162494

    hello, my friend just picked up a 1948 sea king 5hp.it has no spark. are there any common problems with these ignition systems.is there a way to test the coils.thanks

    frankr
    frankr
    US Member - 1 Year
    Replies: 3943
    Topics: 43
    #162554

    Those coils were made before OMC learned how to make coils that self destruct and were near-bulletproof. 90% of the no-spark problems are due to dirty/corroded breaker points and they are difficult to clean in place. Take them completely apart, degrease everything, and polish each contact individually. Reassemble and set gap to .020″. I’ll bet you will have fire.

    Be careful not to lose any of the bitty insulators, etc. Do one set at a time so you have a sample of how they go together.

    Ignorance is simply a lack of education. Ignorance can be cured. There is no cure for Stupid.

    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 3926
    Topics: 396
    #162578

    Does your mag look like this one?

    It should and removing the gas tank first will make it easier to work on the mag. You can check the coils with an ohmmeter and the primary side, the two loose wires, should read really low, around one ohm. Connecting the meter to the secondary winding, the spark plug terminal and one of the wires, should give a reading around 3.5 thousand ohms. The secondaries can read a bit higher or lower and still work fine. While the ohmmeter is out, take a reading of each spark plug wire from the plugs terminal to the terminal on the coil. Again, the reading should be really low.

    In this batch of coils, only half of them were any good. That is uncommon.

    As stated, work on one set of points at a time so you don’t get the parts mixed up. All of the brass parts should be degreased and polished to remove any tarnish. They have to have continuity between them and if they aren’t clean, chances are they wont work. The points can be cleaned and polished with wet n dry paper. 400 – 600 grit will remove any pitting or oxidation and finishing with finer grades up to 1500 or 2000 will put a mirror finish on them. The original condensers were rated at 0.16 – 0.24 uF so they should be tested or replaced if in doubt.

    When installing the points, make sure the rounded end of the plunger rod goes towards the points with the square end towards the crankshaft.

    If you remove the coils, they will have to be gapped to the rotor magnet using these instructions.

    • This reply was modified 2 months, 2 weeks ago by Mumbles Mumbles.
    • This reply was modified 2 months, 2 weeks ago by Mumbles Mumbles.
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    wrenchero

    Replies: 34
    Topics: 18
    #162762

    thanks for the great info.my friend is going to bring it over on sunday so we can check it out

    Avatar
    wrenchero

    Replies: 34
    Topics: 18
    #164140

    my friend brought the engine over and we found out that he had one bad coil and one bad condenser.he got a new coil and 2 new condensers.it has great spark and he got it started.he is trying to figure out the mixture adjustments now but its running hot so i am starting a new post.thanks again

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