Plooms of blue smoke after oil change ??????

[Lazy-Ferret]

What is the blow by pipe ?

Is it the pipe that comes off the top of the rocker cover then goes into a black cylinder type thing with 2 pipes off it 1to the sump the other to the turbo induction pipe ?

My next question was going to be what if I removed that black thing as I've blocked off the induction end so I get decent un corrupted air to the turbo

Can't I just put a pipe that joins the one on the rocker cover straight to the sump or is there something going on inside that black thingy ??

Having just taken my "Black Thingy" to bits as I wanted to see how it worked, I can tell you exactly what it is.

It is an Oil trap, and it also contains a "blow by" valve.

You have 3 pipes on to it.
The top pipe is the one from the top of the engine, which has the positive crank case pressure.

One in the side, which takes the fumes etc from the positive crank case pressure down to the turbo to be burnt.

You also have a pipe off the bottom if it, which goes back to the crank case, where any oil that gets blown out the top can then drain down back into the engine.

In the very top there is a rubber diaphragm, which, if the turbo tries to suck out more air than the crank case is producing, should close off preventing this from happening.

I took mine apart expecting the diaphragm to be damaged, but unfortunately it was fine, so I was back to square one in my fault finding.

If you are going to disconnect it, I would get a PCV non-return valve to stop an water and put a filter like "R1cho" has in this tread. http://www.nissan4x4ownersclub.com/forum/showthread.php?t=15819&page=2

 

[niks_terrano ii]

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Would happen then if I removed the blow by valve and just put a pipe from rocker cover direct to the pipe from the sump ?

Would I damage anything ?

 

[Lazy-Ferret]

Most likely Yes...

I put my thumb over mine, and it blew the dip stick out. I have since read that a blocked crank case breather could also blow out oil seals, particularly the crankshaft one behind the fly wheel resulting in a nicely lubricated clutch...

Basically, it has to vent, to get rid of any "blow by" from the piston rings.

 

[niks_terrano ii]

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So if I block off the pipe that goes down to the air induction pipe am I pressurising the system ??

 

[makeitfit]

To eliminate cc pressure issues, just take the pipe off where it joins the turbo intake.Then blank off the turbo intake with a bolt or something. Then drive the car again.

 

[niks_terrano ii]

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What I've done is pinch the "L" piece that connects the pipe that come off the turbo inlet pipe to the blow by valve is that ok or does that pressurise the system ?

 

[niks_terrano ii]

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Hi guys just a little update run the truck up today and hey presto smoke gone !!


What a relief !!

Thanks for all your input guys :thumbs