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I have a 1979 115 HP Evinrude and it run rough. I took out a spark plug and it had a milky film on it. Took out the other plugs and they were oily. Could this be a head gasket or a cracked cylinder? Any advice would be greatly appreciated.

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I would bet on a head gasket. Sorry about your luck.

Posted on Aug 06, 2009

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,y 84 nissan 30zx 2+2 is overheating.water pump works took thermostat out completely. there was no leaks in any hoses is this ok


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I have a 1970 evinrude 115 hp outboard. which when I first got it, had not been run for about 8 years. I removed the plugs, oiled the cylinders, and made sure I could turn it over by hand before I cranked...


A couple other things to check... Is the stator still good? This provides the electric current to provide spark to the plugs. The magnets under the flywheel also need to be in good shape. Sound sliek these havent been checked as yet. If they are good, the next thing I would check is the actual spark plug wires themselves. These can degrade and require replacement as well. Just take it bit by bit and hopefully you will find the problem, but those are the two things I would check next because it appears you have replaced just about everything else!

Good Luck

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You changed 6 coils, but you didn't change spark plugs? The new coils give strong spark to burn off resisdues from your old plugs plus what ever left inside the combustion due to bad old coils causing smoke and bad ordor. Change all new spark plugs so you can have good ignition to burn off all junks inside combustion chambers. Smokes are at the beginning, but it will go away after less than 10 minutes.
If it is not going away you may have other problemS:
Rich mixture causing engine check light come on.
Check if engine oil level.
Check if your coolant level.
Open the oil cap to see if you have milky stuff. If there is milky stuff then you have bad head gasket.
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