Smoke from Valve Cover Vent. Mercruiser 165, I/O

[sam.thompson]

Well I have a little smoke that comes from the valve vent cover when I run the engine at high RPMs.
If it is blow by, should I be worried about water getting into the oil at the same time?

Extensive checks on the oil doesn't indicate I have water in the oil but didn't know if i should be worried at this point if I'm getting blow by that water may somehow be getting into the oil or could.

72 Mercuiser 165, inline 6, I/O

 

[oldjeep]

Re: Smoke from Valve Cover Vent. Mercruiser 165, I/O

Why do you think that blow by would cause water to get into the oil? It can cause fuel to get into the oil, but not water.

 

[Bondo]

Re: Smoke from Valve Cover Vent. Mercruiser 165, I/O

Well I have a little smoke that comes from the valve vent cover when I run the engine at high RPMs.
If it is blow by, should I be worried about water getting into the oil at the same time?

Extensive checks on the oil doesn't indicate I have water in the oil but didn't know if i should be worried at this point if I'm getting blow by that water may somehow be getting into the oil or could.

72 Mercuiser 165, inline 6, I/O

Ayuh,... Water in the oil is usually a cracked block or heads,....

Blow-by is caused by worn piston rings,...

2 Very different issues,....

 

[bonzoscott]

Re: Smoke from Valve Cover Vent. Mercruiser 165, I/O

When you say the smoke is at "High RPM", are you getting smoke in the boat while cruising outside of the engine cover? A little smoke is normal but just not sure what or how you're seeing smoke at high RPM.