Do you have hoses running from the valve cover to the filter cannisters? They usually come from a PCV valve and the intention is that the engine aspirates any oil vapours from the crankcase.

In some cases an excess of oil will travel this path and be evidenced by what you're seeing. However that's usually on older engines that are suffering from "blowby" that tends to pressurize the crankcase and force more oil out those hoses. With a freshly rebuilt engine (assuming a proper job) that shouldn't be happening.

 

Yes, Faster
it does have those hoses and that is where the oil is coming from. should i block those hoses off? or will that cause more problems.

 

can those pvc hoses be blocked off or will that cause more problems?

 

Don't block it off but you may need to wring out the circular sponge filter more often.

 

OK, thanks, erip - I forgot the right name

 

No you shouldn't block them off... they are how the gradual buildup of gases and pressure in the crankcase are relieved. The idea is the suction from the air intake puts the vapours back through the combustion side of the engine.

Blocking them off will eventually allow that pressure to build, resulting in leaking seals, oil coming out the dipstick tube and any other way it might find.. making a mess of the engine space..

Here's an interesting discussion on Wikipedia: (I doubt these engines have an actual 'PCV valve)

PCV valve - Wikipedia, the free encyclopedia

There's mention here of an "oil trap" that might be installed between the valve cover and the connection to the breather. Food for thought....

 

There's mention here of an "oil trap" that might be installed between the valve cover and the connection to the breather. Food for thought....

A fellow over on the C-34 owners website shows pictures of a home made trap he made. IIRC, it was basically a canister made out of a couple of cans with hose fittings at either end with foam rubber in the middle.

 

Both, good suggestions.
I'll follow up on this
Many thanks!
chuck

 

Is it possible to vent the lines into fuel tank? I don't see why it can not be done. Just an idea...

 

Aside from the uncomfortable idea of putting warm combustible vapours into the fuel tank, a lengthy line to the fuel tank, and to a normally vented tank may not evacuate enough fumes.. The crankcase ventilation relies on the considerable suction of the air intake of the engine.

 

I don't see any problem with any of before mentioned.
Modern trucks and diesel cars and expensive boats actually heat the fuel and recirculate it through the tanks, they all run hot fuel. I don't see any problem with fumes in the tanks, besides fumes are blowby exhaust gases. I also don't think that the suction plays any role - crank case is pressurized by blowby.
On trucks it is just vented outside.
The only problem I see is that exhaust gases can contaminate the fuel, technically speaking it is hard particles suspended in air....
But, anyway, they suck it into engine and mix it with fuel there, so it shouldn't do any damage to fuel.

 

.....I also don't think that the suction plays any role - crank case is pressurized by blowby....

The entire purpose of plumbing the crankcase vent into the intake is to PREVENT crankcase pressurization. Shaft seals, dipstick tubes, etc are not designed to withstand internal pressure. Yes, on a truck these vents are external, but on a boat expelling those fumes into the engine space just won't do. If you try to go to the fuel tank you'll pressurize the lot to no good effect.

The fuel tank is vented to the outside. If you vent pressurized crankcase gases to the fuel tank, you're blowing hydrocarbon molecules out the fuel tank vent. At least with the crankcase venting into the air intake on the motor, it's going back through the combustion process and coming out the other end co2 and h2o.

... not to mention the mess that would make on the hull at the vent...

 

The fuel tank is vented to the outside. If you vent pressurized crankcase gases to the fuel tank, you're blowing hydrocarbon molecules out the fuel tank vent. At least with the crankcase venting into the air intake on the motor, it's going back through the combustion process and coming out the other end co2 and h2o.