Topic: 1963 Evinrude 10 HP running problem – Antique Outboard Motor Club,Inc

This topic has 20 replies, 8 voices, and was last updated 5 years, 9 months ago by Steve D.

Viewing 10 posts - 1 through 10 (of 21 total)

1 2 3 →

Author

Posts
June 29, 2018 at 6:00 pm #10403
Steve D
Participant
Someone asked me to look at his motor and help him figure out what’s causing it to act like this ( https://www.flickr.com/photos/55515333@ … res/p3oPwC ) but before I dive in I wanted to get some thoughts from you guys.

All I’ve done so far is check compression which is good at 83/85, and pop the flywheel. It doesn’t "look" bad with Prufex coils and OEM parts. I haven’t actually tested those yet. Armature plate is dry (and so is under the flywheel) so it doesn’t look like there is a bad top seal but there is a fair amount of gas/oiliness on the motor and in the pan and evidence of leaking at the crankcase seams.

He said the carb was recently cleaned but not rebuilt and it still has the cork float. There was a missing screw on the fuel pump and a couple fuel lines were kinda sloppy/loose on the fittings possibly letting air in. That’s pretty much all I know or observed so far.

Attachments:
June 29, 2018 at 6:32 pm #78679
frankr
Participant
US Member
One cylinder cutting in and out. Ignition problem.
June 29, 2018 at 6:40 pm #78680
bob
Participant
I agree.Cylinder cutting out.Sometimes the coil can be good but the ignition wire connecting to that small pin in the tunnel of the coil is corroded or pin is starting to crack.Same thing with the connection to the pin insert to the spark plugs.
June 29, 2018 at 7:04 pm #78682
Steve D
Participant
Ok guys thanks, was kinda leaning that way, just wasn’t sure. Will start checking ignition components.
June 29, 2018 at 8:13 pm #78687
frankr
Participant
US Member
Might be arcing out of the plug boot and across the plug to ground. Just a guess
June 29, 2018 at 9:42 pm #78690
Steve D
Participant
Thanks Frank, for starters I’ll be (checking the coils and condensers), replacing the wires, screwing them in to the coils, make good contact with spring clips and replacing boots if necessary and then see what happens.
June 29, 2018 at 10:25 pm #78693
fleetwin
Participant
US Member - 2 Years
Yeah, sure sounds like an ignition problem…I’m looking at your second picture but wondering where are the plug wires? That engine looks to be a how hour 10hp for sure. The ignition looks freshly repaired, but that doesn’t mean it is functioning properly. I guess I would put two of those inline neon testers in the plug leads and go for another boat ride after dark.. In the dark, you may be able to see/hear a plug wire arcing also. Hopefully you can pinpoint the problem cylinder to help find the actual problem…Have you tried different plugs, sure don’t want to overlook the simple stuff…
It is possible that the engine is dropping a cylinder for reasons other than an ignition problem, but not real likely…
June 29, 2018 at 11:16 pm #78698
Steve D
Participant
Just tucked the plug wires out of the way for the picture. Will definitely be checking all the simple stuff too, thanks.

Attachments:
June 30, 2018 at 1:24 am #78703
Steve D
Participant
I think we have a winner…

Attachments:
June 30, 2018 at 1:34 am #78705
bobw
Participant
US Member
Yep, think you found it. Might want to just replace both plug wires and boots while you’re into it.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
Author

Posts