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TOPIC: 1956 5.5 evinrude excess oil

1956 5.5 evinrude excess oil 4 months 2 days ago #140534

  • curse
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My neighbor was running my 1956 5.5 while I ran to the store. When I got back this is what I saw. The top layer of the water is oil. What's a likely cause?
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1960 slickcraft catalina
1963 g-w invader ski-bird
1972 g-w invader drag & ski 14
Portage Michigan

1956 5.5 evinrude excess oil 4 months 1 day ago #140536

Looks normal for those really old motors.

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1956 5.5 evinrude excess oil 4 months 1 day ago #140537

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Un Burnt oil ran in the motor out the exhaust Way to heavy mix oil. 50-1 fine. Damn sure not gear oil, and I just SOLD a 60 5.5

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1956 5.5 evinrude excess oil 3 months 4 weeks ago #140552

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You can't use 50:1 on the old Johnrude engines that don't have roller or ball bearings. You MUST use a richer mix (at least 25:1) or you're gonna have trouble down the line.

Conversely, all but the very early Mercs used "fully jewled" powerheads, with ball, roller, or needle bearings on the rotating elements. These can safely use a mix of 50:1. Merc even issued a bulletin to that effect. That being said, it's a proven fact that you get better ring sealing with a richer oil mix, and if you were to run the old-timer Mercs on 40:1 or richer mix, it ain't gonna hurt nuthin'. Racing engines are the exception and you must run a far richer oil mix on 'em. BTW my old Goodyear (Sea King Clone) 5hp Twin used a 12:1 oil mixture! It didn't smoke that bad, considering. If you use a quality oil, you'll have less problems with that. West Marine sells a "smokeless" 2-stroke oil, and the stuff from Amsoil is pretty good too, from what I understand.

Back to the little JohnRude in the bucket, it looks to me like it's either not burning the fuel well (too rich, or poor spark, incomplete combustion), or there's a water intrusion issue in the powerhead. Those are very common ways to get that much emulsified fuel/oil mix in the water.

Most likely one or both of the ign coils are cracked or oozing dielectric. Notorious for that. Replace both coils for good measure & install a Tune-Up Kit (points, condensers, points lube), and likely she'll purr like a kitten.

Could also be carb issues (leaky float needle or running too rich), but my bet would be ignition issues or water intrusion.

HTH.........ed

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1956 5.5 evinrude excess oil 3 months 4 weeks ago #140553

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I thought those old Rudes were Jeweled? My mistake..( what Ed says is the way too go)!

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1956 5.5 evinrude excess oil 3 months 4 weeks ago #140563

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Not uncommon for an older motor.
Here's my '76 Johnson while I was cleaning it with SeaFoam. Before and after.
The motor sat for many years and the PO never took very good care of it.
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