[julianm]

Can`t get my electronic parts catalogue running, & the Haynes manual is still on the way, so would appreciate identification of the part missing from this pipe on the induction side - drawing in air when engine running as the pipe is connected to the inlet manifold - have popped in a M5 screw to hopefully prevent lean running as a temporary measure. What do I need?? Hope the pic makes it clear enough.
Any help gratefully received!

 

[Guest]

Looks to me like the feed to the boost gauge, but can't tell exactly from the image.

Do you have an image showing where it's connected to on the inlet manifold, as there are several air hoses on it?

 

[julianm]

Thanks very much for the help - here`s where it connects to the manifold.

While I`m at it - this other connector sits (at least that`s where I found it) in a threaded hole between the 1 & 2 injectors on the maniufold side - end is damaged as you can see - certainly not a tight fit in this threaded hole - other end feeds into the breather pipe on the cam cover - what`s this then??
Please excuse the ignorance!

 

[klarking1075]

The bit you are looking at is the PCV which runs from the same plug to the top of the inlet manifold. What exactly it does I don't know but I'm sure someone will fill you in.

The other bit from the connector in the cylinder head goes from the air intake pipe (before the turbo) upto the cylinder head, and is used to recycle some of the exhaust gases into the chambers to be reburned for environmental reasons.



Kenneth

 

[julianm]

Thanks to you both for your help - I think I may be missing a T piece or some other connector somewhere - there isn`t any sign of a spare pipe or nipple on the inlet pipe anywhere I can spot. I think I need a look at a `proper` set up to compare mine to. At present there`s no apparent problem with runing or performance. Surely the threaded hole in the manifold should have a threaded adaptor of some sort?
I`ll try the local dealer tomorrow with a bit of luck!
Thanks, Julian

 

[klarking1075]

If you give me an hour I'll photograph the bit you are looking for and what it should look like.

Kenneth

 

[djtaylor]

My PCV is a ball bearing type but you can see it pretty clearly, it's the tubular silver coloured bit just above and right of the the B.

 

[djtaylor]

The bit you are looking at is the PCV which runs from the same plug to the top of the inlet manifold. What exactly it does I don't know but I'm sure someone will fill you in.
Kenneth

The valve merely prevents the crankcase from being pressurised by boost pressure.
In a normally aspirated engine, combustion fumes that bypass the piston rings end up in the crankcase and the breather hose connects back to the inlet manifold so that they get passed back into the combustion chamber. As you say, it's for emissions purposes.

The issue with a turbo engine is that without the PCV which is just a one way valve, boost pressure would be present in the crankcase and timing cover such that oil seals can be stressed with the undesired pressure. When the engine is under overrun, there's negative pressure in the inlet manifold and the valve opens and the crankcase gases are pulled in and burnt.

David.

 

[julianm]

Hello David & thanks very much for your trouble - it`s appreciated! Lovely clean engine bay & the hoses are a lot smarter than mine!
The pic quality is good enough for me to zoom in & see whre the PCV goes, so I`ll reconnect it. I`m left with this threaded hole now! I`ll take a pic tomorrow if at all poss. -pouring with rain at thew moment, and hopefully someone can identify it - it`s between injectors 1 + 2. - bit difficult to photo but I`ll have ago. I`ll probably end up blanking it off as a temporary measure - holidays on Monday & a long drive coming up!
Thanks again, Julian

 

[julianm]

mystery hole!

Hello again - here`s a pic of the tapping into the manifold - between 1 + 2 injectors. I`ve since popped in a screw to seal it as a temporary measure as I don`t want any bits sucking in.
Any ideas?
Thanks, Julian

 

[djtaylor]

Two things, what model engine is it because there are differences in intake manifolds and I can't see enough of the manifold to determine which it is.

Second thing, can you do a pic from a bit further out showing more of the manifold?

David.

 

[julianm]

Hello David - I`ve got the pic, and the pen lines up with the hole. The nipple for the tube to the PCV is just visible in top rh corner above the thick foam protective sleeve.
The engine is a `97 FPT - checked with the VIN on the 9000.com site & it confirms.
Thanks again for all your assistance!
Julian

 

[djtaylor]

I don't recall anything on mine but it's in the garage now and I'd have to back it out to lift the bonnet. From the location though I don't believe it's into the inlet ports though unless you're saying otherwise.

Maybe it's a mounting point for something like a cable clip? Hopefully someone else will have something to offer?

David.