Home › Forum › Ask A Member › 71 Evinrude 18 hp cooling problem › Re: 71 Evinrude 18 hp cooling problem
Can we assume you are running it on a boat, on the lake? The goop running out is oil that has gone through the motor and what hasn’t burned has gone out the exhaust. In the exhaust, it mixes and emulsifies with the spent cooling water. If you had sufficient water, it would probably go unnoticed.
Has the motor ever been overheated? That motor has a plastic restrictor in the water outlet, under the powerhead. Overheating melts it. Since you say yours is intermittent, that may not be the problem, but it is something to consider.
Overheating battery cables are a sure sign of poor contact at the point of overheating. Or they are undersize (corroded away). You say they are clean. Clean them again, but this time get them shiny bright clean.