whats this pipe...please.
27 February 2015, 03:39 PM
#1
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whats this pipe...please.
im in the middle of fitting a defi oil temp sensor..im fitting into the plug shown in red..
however ive found a little pool of oil..
so what is the pipe shown in yellow?? it looks like the oil is coming from that pipe but the bottom side of it.. is it some sort of crankcase breather?? rather than a oil pipe?? if its the former then it would be ok to leave??
however ive found a little pool of oil..
so what is the pipe shown in yellow?? it looks like the oil is coming from that pipe but the bottom side of it.. is it some sort of crankcase breather?? rather than a oil pipe?? if its the former then it would be ok to leave??
27 February 2015, 04:09 PM
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Looks like part of the PCV system. The yellow ring is where the crank case breather (the red ring) should connect to, there should be a rubber hose that joints the two points.
27 February 2015, 05:16 PM
#4
I am confused... you removed the pipe to show the leak? Or you have two pipes that are not joined?
If you have removed the pipe to show the leak then the leak is probably a loose or cracked pipe. No a big issue just get a new bit of pipe. A little leak in the mean time won't matter too much.
If you are saying that pipe is missing then there should be an elbow to join them. If they are just left disconnected there are several issues.
1. Your intake will suck air in that hasn't been measured by the MAF or filtered by the air filter.
2. Your PCV system is allowing unmetered air to be sucked into the intake manifold on vacuum.
3. The dirty air from your crank is venting to atmosphere but has no suction from the PCV to pull the crap out and pull fresh air though the head breathers from the intake.
If you have removed the pipe to show the leak then the leak is probably a loose or cracked pipe. No a big issue just get a new bit of pipe. A little leak in the mean time won't matter too much.
If you are saying that pipe is missing then there should be an elbow to join them. If they are just left disconnected there are several issues.
1. Your intake will suck air in that hasn't been measured by the MAF or filtered by the air filter.
2. Your PCV system is allowing unmetered air to be sucked into the intake manifold on vacuum.
3. The dirty air from your crank is venting to atmosphere but has no suction from the PCV to pull the crap out and pull fresh air though the head breathers from the intake.
Last edited by FMJ; 27 February 2015 at 05:20 PM.
27 February 2015, 06:58 PM
#6
PCV Positive Crankcase Ventilation.
"On the classic you have the breather system as follows:
There is a pipe which is connected to the intake hose near the power steering pump. The pipe splits into two and goes to each head.
You then have the crank breather located just to the right of the turbo and to the left of the throttle on the block. This is divided into two. There is a small opening which leads back to the intake hose just before the turbo. There is a bigger opening which is connected to the throttle body via a one way valve (PCV Valve).
On boost and full throttle the PCV is closed. The pressure in the crank case exits the engine via the hose into the intake hose pre-turbo. It may also vent a bit through the heads but not much.
When you are off boost and there is vacuum in the intake manifold the PCV opens and the vacuum pulls dirty air from the crank case vent into the intake manifold to burn it off in combustion. This causes a vacuum in the crank case and clean air is sucked into it via the two head vents. As the head vent pipes and the two way crank vent can vent are all connected to system post MAF it is all read equally (no air escapes after the MAF has accounted for it)."
"On the classic you have the breather system as follows:
There is a pipe which is connected to the intake hose near the power steering pump. The pipe splits into two and goes to each head.
You then have the crank breather located just to the right of the turbo and to the left of the throttle on the block. This is divided into two. There is a small opening which leads back to the intake hose just before the turbo. There is a bigger opening which is connected to the throttle body via a one way valve (PCV Valve).
On boost and full throttle the PCV is closed. The pressure in the crank case exits the engine via the hose into the intake hose pre-turbo. It may also vent a bit through the heads but not much.
When you are off boost and there is vacuum in the intake manifold the PCV opens and the vacuum pulls dirty air from the crank case vent into the intake manifold to burn it off in combustion. This causes a vacuum in the crank case and clean air is sucked into it via the two head vents. As the head vent pipes and the two way crank vent can vent are all connected to system post MAF it is all read equally (no air escapes after the MAF has accounted for it)."
