Re: johnson 10 hp QD-19 no power
Kevin - A really common problem with those engines is that the ignition coil cracks from age, and arcs over at high rpms. Fortunetly, since OMC used the ignition coils from the early '50s through the late '70s, they are cheap and available. Since the ignition system is completly indepenant cylinder to cylinder, it's really common to only loose spark to one cylinder.<br />The ones I get usually look something like this:<br />
<br /><br />To confirm this, try pulling one of the spark plug leads. If there's no change, that's your good cylinder. If it dies, that's your bad one.<br />To inspect the ignition coil, you'll need to remove the flywheel. For that, you need a puller that employs the three bolt holes near the hub of the flywheel. If you use a puller that pulls from the edges, it will break the flywheel.<br /><br />You should replace both ignition coils, points and condensors. If you shop around, you can get all that for about $50. Under a hundred if you don't shop.<br /><br />The other thing you need is a service manual. Iboats sells aftermarket ones. You can get an OEM one
here or
here. <br />Your local library may be able to lend you one too. <br />You'll need it since there's a number of adjustments you'll need to make after installing the new points and coil.<br /><br />EDIT: I see you already have one. They clymer manual should be helpful if it covers small OMC engines made in the 50's and 60's. <br /><br />Do not rev the engine in neutral or out of the water! That engine will run-away, turn up to incredible RPMS, and fly apart. You don't want to do that to something that's survived 50 years! If you've run that engine without any water supply, you have already destroyed your water pump's impeller. You'll need to replace it. If not, it's a good idea to replace it anyway.<br /><br />PS - A QD-19 is a 1958, 10hp engine.<br /><br />Good luck!
