Oil on top of spark plug and milky oil

[jattard]

Helping a friend with an 2017 AR195. Driving at WOT had smoke, loss of RPMs and small oil/fuel slick in exhaust water. Drove it back to dock just fine, no symptoms. Cylinder #1 had oil on the top side of the plug. Also, noticing milky oil in fill cap, dipstick, etc. It would seem the valve cover gasket has issues for the spark plug oil, but cant understand why milky oil too. exhaust manifold or head gasket would need to fail to mix water/oil. TIA

 

[Scottintexas]

Where are you boating at?
How long has he owned the boat?
Does he do his own up keep?
Do you notice any extra water under the engine?

 

[Scottintexas]

Has it ran much so far this summer?

How many hours are on the engine?

 

[anmut]

Initially sounds like some gaskets that need to be replaced.

 

[WREKS]

Have there been any overheats?

 

[Cobra Jet Steering LLC]

does he know not to run the hose with the engine off when flushing it and not to tow it over 5 m p h if it has to be towed in and as @swatski has recommended if you tow it have the reverse buckets UP in forward.

 

[jattard]

Where are you boating at?
How long has he owned the boat?
Does he do his own up keep?
Do you notice any extra water under the engine?

Michigan
4 years
Yes, he performed oil change and is aware of the proper hose operation.
No extra water in engine bay.

 

[jattard]

Have there been any overheats?

No overheating.

 

[jattard]

Has it ran much so far this summer?

How many hours are on the engine?

Probably 10 runs this season, after the spring oil/spark plug change. Thinking the event with smoke and oil slick was the trigger for milky oil.

 

[jattard]

225 Hours on boat

 

[jattard]

Dealer said cracked head! Known issue with the engine. I have never heard of this being a known issue. Trying to get pictures of the damage...

 

[Farny]

Dealer said cracked head! Known issue with the engine. I have never heard of this being a known issue. Trying to get pictures of the damage...

Any pics? Update on this? Thanks