Question on vent pipe 2002 Spyder

Cliff

Member
Messages
174
Could someone please tell me if part number 184216 is just a straight through pipe or does it have a valve inside it. My blow by system is the old solution with a valve in line and the new solution looks like it has no valve. Thank you
 

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Zep

Moderator
Messages
9,110
It is a pipe, no valve, with a braided section and then crimped onto a solid section of pipe.

88679
 

Cliff

Member
Messages
174
It is a pipe, no valve, with a braided section and then crimped onto a solid section of pipe.

View attachment 88679
Thanks Zep,
I have the gurgling sound on tick over and if I pull the dip stick it goes. I have read that it could be the front crank seal but I have far to much negative pressure at the oil filler to the point that when the engine is running I struggle to undo the filler cap the vacuum is that high. The vacuum of corse is coming from the induction manifold connected via a thin pipe to the oil tank but my vent pipe has a valve in it with the flow direction going towards the induction tube not the oil tank. I’m thinking it should be pointing towards the T peace No12 so it can pull in air from the induction tube and crank case. I have checked all the pipes going to manifold, heads and crank case and all seem clear.
 

Zep

Moderator
Messages
9,110
How much oil is in there? If the inlet manifold vacuum is causing gurgling then it’s trying to draw air through oil, and the level shouldn’t be that high when running.

Be sure to only check the level when running.
 

Cliff

Member
Messages
174
How much oil is in there? If the inlet manifold vacuum is causing gurgling then it’s trying to draw air through oil, and the level shouldn’t be that high when running.

Be sure to only check the level when running.
No level is spot on
 

Oneball

Member
Messages
11,075
Part 12 is an oil separator. So the one way valve will allow oil to flow from the separator back to the engine. So direction of flow will be downwards in the diagram.
 

Cliff

Member
Messages
174
With the valve flow pointing to induction tube there’s no where for air to be pulled in. Will give it ago tomorrow with the valve going the other way. I must say I’ve had the gurgling since I bought it 2 months ago. With the valve the other way it can draw air in but not let air or oil go out into the induction tube which makes more sense.
 

Oneball

Member
Messages
11,075
Do you know anyone else with one for comparison? Dry sump scavenge pumps suck constantly from the sump and at idle there won’t be much if any oil in the sump.
 

Cliff

Member
Messages
174
Part 12 is an oil separator. So the one way valve will allow oil to flow from the separator back to the engine. So direction of flow will be downwards in the diagram.
So air should flow towards the separator no
 

Cliff

Member
Messages
174
The rubber seal has now separated from the inside of the oil filler cap there is that much vacuum. And it’s still hard to lift the seal when just the rubber seal is on and the engine is running
 

Oneball

Member
Messages
11,075
So air should flow towards the separator no

Air flows across the top 19. The funnel has a swirl inside that allows oil vapour to fall out to the bottom then pass through the valve.

maybe valve 27 has failed. And is allowing vacuum to the sump. Can you block pipe 25 or 29 to see if it fixes it?
 

Cliff

Member
Messages
174
Tried 25 and was the same and I thought it would stop it as well. It does say that 27 is a valve but don’t know how as you say oil vapour has to return
 

Zep

Moderator
Messages
9,110
It seems to me that air should be let into the system from the inlet tube, and if, for any reason the tank becomes pressurised, the oil seperator and valve allows oil back into the sump. If air always flows from the inlet pipe to the tank, then there would be no need for the separator, which I guess is why it was removed on later cars.
 

Cliff

Member
Messages
174
It seems to me that air should be let into the system from the inlet tube, and if, for any reason the tank becomes pressurised, the oil seperator and valve allows oil back into the sump. If air always flows from the inlet pipe to the tank, then there would be no need for the separator, which I guess is why it was removed on later cars.
Zep Where union no33 screws to the bottom of the crank case ( sump ) is that just blanked of on later cars.
Bet I have loads of oil leaks tomorrow and the only thing keeping the oil in has been the vacuum. Ha
 
  • Haha
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Cliff

Member
Messages
174
Well this is how I think the direction of flow should be from the intake tube to the separator. If anyone knows otherwise please let me know before the engine blows up ;-)
 

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