1956 Evinrude.

[GMCAMARO]

I recently came in to a 1956 15hp Evinrude. I thought the oil/gas ratio was 50:1, but last night I was readinga repair manual and found that the recommended Gas/Oil was 24:1. I ran about 9 Gallons through the engine at 50:1. <br /><br />Should I do a compression check now to see how much damage I did? It appears to be running fine. Should I run a tank through at more than 24:1 ?

 

[rolmops]

Re: 1956 Evinrude.

Hello.<br />The 24:1 from 1956 was with nondetergent sae 30 car engine oil.Today's TCW-3 that is advised for water cooled outboard engines is a lot better.<br />You should not have to worry about using to lean a mix,as long as you don't make it a habit.In the long run it will ruin the '56 bearings.<br />From here on just put 24:1 or what many people use(me included on my '57)32:1.<br />You should be alright and no you should not have to do a compression test.

 

[steelespike]

Re: 1956 Evinrude.

I would run a tank at 16:1 or so to get things well lubed then go back to 24:1.<br /> A compression check wont tell you to much unless you know what it was before.<br /> You could try looking in the spark plug<br />hole see if you can see the cylinder walls.<br />Check for scoring.<br /> Try rocking the flywheel back and forth listen for rattles.I had an old 25 Gale that rattled<br />and I ran it for 3 years before it suddenly threw a rod. Not that you should do that but<br /> she sure ran a long time.