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[Tick Tock]

Hi All, having removed cylinder heads from block, just wondered what these two valves are - A & B.



Is it advisable to remove item A from block whilst access is good, strip and clean? Or leave well alone?

Also should I take the opportunity to flush out certain components on the cooling / heating apparatus whilst I've got the opportunity?

Any comments most welcome.

[Entwood]

To me it looks like .....

A = Breather box

B = HBV (Heater Bypass Valve )

[The Red Baron]

To me it looks like .....

A = Breather box
B = HBV (Heater Bypass Valve )

i think, as you have it stipped down that much it would be good to clean it out.
as for the hbv, if its not leaking then leave alone.

[amba]

Both parts are as identified.

I would be gratefull ,whilst it is in that stripped dpwn condition,for a closer pictute of the breather box..A..as I need to replace my carbon cannister purge valve in the near future and would be gratefull of the benefit of a better view.

Many thanks

[Tick Tock]

I'll take it off later this afternoon for cleaning and will take some more pics. As advised, I'll leave the HBV alone.

[Lizzie_Zoom]

That is a great picture Tick Tock, and is a view not everyone gets to see

You are obviously doing a good job, stripping it all down 8-) 8-) 8-) 8-).

[amba]

Many thanks Tick Tock.....as Lizzie says pictures are very helpfull and it is only when somebody takes the trouble to document this type of work as you have,others with less confidence can really see what is involved.

My main interest is the purge valve which is the small peice to the r/h side of the carbon cannister(A) as I have managed to snap the little nipple off which holds the breather pipe to.

[ffcgary1]

I would leave the breather gox well alone, just make sure that the little hole at the top is clear. dont disturb any thing that does not need to be touched.
jmo.

[Tick Tock]

I've decided to leave the breather box alone. It looks like labarithical type of device, with little or nothing to go wrong with it, apart from cleaning the visible gunk out of the pipe and checking the small pipe isn't blocked.





Another view, showing the underside, and the purge valve with bracket which mounts onto it.

What is the purge valve supposed to purge?

[amba]

Tick Tock.

Many many thanks for the excellent group of pictures which will be very usefull ,to not only me, I am sure.

I agree with ffcgary and would leave the bretaher chamber alone other than a clean...chrisgixer did split one apart and it is just a section of chambers .

Like you I am unsure of the exact purpose of the purge valve and why it has an electrical connecter,but I am sure somebody more knowledgeable will be able to supply the answer.

I am also curious to know what if any ill effects would happen to the engine if the small pipe that fits onto it from the top plenum breather is not a tight fit.

[RobG]

Tick Tock.

Many many thanks for the excellent group of pictures which will be very usefull ,to not only me, I am sure.

I agree with ffcgary and would leave the bretaher chamber alone other than a clean...chrisgixer did split one apart and it is just a section of chambers .

Like you I am unsure of the exact purpose of the purge valve and why it has an electrical connecter,but I am sure somebody more knowledgeable will be able to supply the answer.

I am also curious to know what if any ill effects would happen to the engine if the small pipe that fits onto it from the top plenum breather is not a tight fit.

It allows the carbon canister in the drivers side wheel arch which traps any petrol fumes to be vented into the inlet.

Rough idle
High emissions
probably excessive fuel consumption.

If the valve is stuck open or the hose is split, then the engine is taking in extra air