Water in Crankcase Oil on Nissan

[forbiddenx]

I've read through several posts and have a 2005 Nissan 25 HP 4 Stroke and about two years ago developed a water/oil leak issue and had the motor serviced through a private party who replaced all the gaskets but was not able to find a cracked power head or issue. The motor has run fine all along so I have just been changing the oil more frequently and only run it on fresh water. I'm just wondering if there isn't some other issue that might have been missed since this all started during a trip where i was fishing is extremely cold weather 15-20F. If anyone has a reference for an Expert Nissan Mechanic in the Los Angeles area would be good too.

 

[MTboatguy]

I had to replace the gaskets between the lower unit and the upper leg to get the leaking to stop on my Tohatsu, so it might be time to check those gaskets. Check in the iBoats store, they should have a seal kit for that lower unit.

 

[Sea Rider]

Welcome to Iboats,

Water in oil means the engine is making oil due to inside water condensation while boating at cold locations. If continues, don't fill oil at max marked level, right betweeen middle min-max marks. Use SAE 10W-30 mineral oil and change every 50 worked hours. Assume will have no issues on warmer climates in which case can fill oil to max mark on dipstick and change oil every 100 worked hours.

Happy Boating

 

[MattFL]

Is it gas in the oil, or water? Water will give it a milky appearance after running, gas will just dilute the oil and make it thinner. 2 different problems.

 

[Sea Rider]

Same water condensation is happening down here on 4 strokes engines due to high moisture/cold temps specially durring winter time. Owners are not aware of it because all are new to 4 strokes engines and the owners manual does not mention a thing about this issue.

Fuel in oil due to faulty fuel pump disaphragm will come out quite "smelly and thin" and runing at that condition for prolongued time will wear all rotating and moving parts inside crankcase much faster. This same issue happened to a Italian car used to have moons back with terrible consequences.

Happy Boatting

 

[forbiddenx]

I'm going to change the oil and filter this week and try filling 1/2 way. The comment from MTboatguy makes alot of sense because it also looks like i'm leaking some water between the upper and lower when running it on ear muffs in the driveway. But its in an obscure location thats very hard to get a visual between the transom and motor. I will keep this thread posted on the outcome.