3200 intake & boost: Pop-off valves are pneumatic connected to thermal valve

[Campoverde77]

I’m servicing my 3200. With 01394 for spare parts number it should be a first series.

The engine block has the thermal valve (part 0000955067) and according to the workshop manual it should be connected to the activated carbon filter, but instead it’s connected to the pop-off valves.
Note that the carbon filter is connected correctly conform one of the diagram versions, the one without thermal valve, provided by the work shop manual.

According to the manual the pop-off’s should be connected to the intake manifold in order to get their pneumatic signal.
Next to that one of the 4 pneumatic connections at the back of the inlet manifold was not used. It was open.

I find this a very strange situation and I have the impression that a mechanic from, or one of, the previous onwers misplaced the air tube. The air tube is also cut very roughly/not nice straight nor smooth.

Would like to have some confirmation before rewiring, so can anyone please confirm my thoughts?Or is anyone known with a modification where above mentioned connection makes sense?

See also pics below:

 

[Contigo]

One of the pipes runs under the throttle body cover and vents to air.

 

[Lozzer]

That doesn't sound right, the pop off valves connect to the manifold surely? Port 8 is blanked off on mine, being a later model.

 

[Oneball]

I’ve just been looking at all this.

Mine is a later one too so only 3 connections on the back of the manifold.

The vac pipes for both pop off valves run up the front of the engine and then under the manifold.

The block valve connects to a three way plastic valve, there is a connection from this to the rear of the manifold and one that disappears into the wing presumably to the charcoal can.

 

[Campoverde77]

One of the pipes runs under the throttle body cover and vents to air.

Thanks.
That’s the boost control valve with indeed a discharge to atmosphere. It’s not the pipe I mean.

 

[Campoverde77]

I’ve just been looking at all this.

Mine is a later one too so only 3 connections on the back of the manifold.

The vac pipes for both pop off valves run up the front of the engine and then under the manifold.

The block valve connects to a three way plastic valve, there is a connection from this to the rear of the manifold and one that disappears into the wing presumably to the charcoal can.

Thanks for havig taken a look.
The piping comes from both pop-off valves and is connected to a Y coupling under the intake manifold. From there on one pipe continues under the manifold up to the end and should go to one of the connections at the back of the intake manifold.



In my car, instead, it goes to the block valve/thermal sensor. It seems to be wrong.


The tube from which I doubt it’s connection seemsa bit long for this specific connection, but it seems to be a bit short to connect to the manifold (although it would be possible to reach it). When I take a closer look at the cut end of the tube I found it very untidy. Especially compared to the rest of the tubes which are cut nice and smooth. It underlines my suspision that it’s manipulated.

How you describe your connection of the thermal sensor sounds ok as it is conform the manual. And indeed from the 3 way valve it goes to the carbon filter under the left hand wing.

 

[Oneball]

This is the three way that is connected to the thermal valve on mine.

 

[Campoverde77]

This is the three way that is connected to the thermal valve on mine.

View attachment 54349

Ok. Clear, and that’s indeed conform manual.
As I have another carbon filter (there are two versions) I should not need to have this connection like you have it. Anyways your connection again indicates that my connection (from pop off to thermal switch) is false.

 

[Lozzer]

Can't even see a thermal valve on mine, is it supposed to be on the rear of the head?

 

[Campoverde77]

Can't even see a thermal valve on mine, is it supposed to be on the rear of the head?

That sounds logic when you have the other version carbon filter.

It should be on the back of left hand side of the block; here:

 

[Campoverde77]

Can't even see a thermal valve on mine, is it supposed to be on the rear of the head?

Can you see how your pop off’s are connected?

 

[Oneball]

I got it wrong then. The 3 way on mine goes to something on the front of the engine as well as manifold and carbon can.

 

[Lozzer]

Can you see how your pop off’s are connected?

Yeh, my pop offs are connected to the back of the manifold via a y piece under the manifold, I must have the other version , there is no thermal valve on mine.

 

[Campoverde77]

Oneball, So is it according to pic below?
But then the thermal valve makes no sense. Do I correctly understand that, where you first thought you had one, you don’t have one?

 

[Campoverde77]

Yeh, my pop offs are connected to the back of the manifold via a y piece under the manifold, I must have the other version , there is no thermal valve on mine , I think the front tube from the 3 way valve ^^^^^ goes to the top of the tb , will check

yes, thanks
The 3way indeed goes to the left tb, see pic above.

 

[Lozzer]

So is it according to pic below?
But then the thermal valve makes no sense. Do I correctly understand that, where you first thought you had one, you don’t have one?

I did not know if I had one or not, turns out I don't

 

[Oneball]

Oneball, So is it according to pic below?
But then the thermal valve makes no sense. Do I correctly understand that, where you first thought you had one, you don’t have one?
View attachment 54370

Yes correct mine is just like that. No thermal valve. I made a mistake.

My pop offs go under the manifold to a t piece and then to the connection at the rear of the manifold.

 

[Campoverde77]

Thanks for your responses guys