Blow by control valve

[bbbmmm55]

Received this in the post today. As mine was quite filthy I had seen posts on how to check its operation but this new one seems to be suffering the same.

So to clarify I tested the original by blowing throught the inlet. Orifice with the o ring. I had air out of both openings.

Blocked the opening at the bottom which drains to sump, blew into the outlet (heading to turbo) and i was able to blow through out of the inlet side.

Is this correct or had I interpreted it wrongly?

Is this new one faulty or can anybody point me to its correct operation.

 

[solarman216]

I have never needed to look at one, but I am guessing it is a simple baffle filter, I would not expect to see any valve inside as that would defeat the object a gauze maybe to help collect the oil, I will pull one off over the week end and have a look, Rick

 

[bbbmmm55]

Thanks, so its a more to seperate the oil from the air that vents from the case rather than prevent any reversal of flow as i had first thought.

 

[solarman216]

Thanks, so its a more to seperate the oil from the air that vents from the case rather than prevent any reversal of flow as i had first thought.

yes you got it, the sump breathing on all engines is fed to the inlet manifold but it is important to limit the oil and that is what that little gizmo does especially with turbo charged motors, on a good engine this will suffice perfectly well but if an engine is badly worn with a lot of blow-by then this little guy will feed oil to the turbo resulting in runaway, but I hasten to add that in a normal engine it is fine, Rick

 

[Lazy-Ferret]

These have a one way valve, in the round bit at the top, so when the turbo is sucking air, it can not suck the oil out of the top of the engine, and only when the preasure in the engine opens the valve, does it allow the pressure to get past. Basically, you should be able to blow through the inlet, but if you block the outlet on the bottom that goes to the sump, and then try sucking through the outlet to the air intake pipe, it should not let you suck.

Sent from my SM-T705 using Tapatalk

 

[solarman216]

Thanks Clive I will check that out, Rick

 

[bbbmmm55]

These have a one way valve, in the round bit at the top, so when the turbo is sucking air, it can not suck the oil out of the top of the engine, and only when the preasure in the engine opens the valve, does it allow the pressure to get past. Basically, you should be able to blow through the inlet, but if you block the outlet on the bottom that goes to the sump, and then try sucking through the outlet to the air intake pipe, it should not let you suck.

Sent from my SM-T705 using Tapatalk

Ill try this tonight when I get home. As I blocked the funnel end and blew through the outlet as opposed to sucking on the inlet side (from the case).