Turbo Vent Filter

Can someone explain what the turbo vent filter is actually for?
Thanks

Well from what i can see, what is described as turbo vent filter is actually EGR modulation valve inlet filter.

it hangs loose and vents to the atmosphere - connects to turbo solenoid

It protects the breather pipe that comes from the vacuum-actuated variable vane mechanism on the turbo. This pipe allows pressure to equalise on the non-vacuum side of the diaphragm, and the filter stops sh!te from being drawn in.

Thanks for the reply. Mine appears never to have been changed so will do that. Is it important to get a Land Rover one?

No any make of filter will do, but if you have not done a service over the last year on it yet, then go for all filters link below.
http://www.ebay.co.uk/itm/121145898705?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT

Ebay here.
http://www.ebay.co.uk/itm/PHB000450-Land-Rover-Freelander-TD4-EGR-Air-Vent-Filter-/370848621756

Or maybe just do the crankcase filter with the breather filter, but you can pick them up at any good motor factor shop.
http://www.ebay.co.uk/itm/LAND-ROVER-FREELANDER-1-TD4-BMW-ENGINE-CRANKCASE-BREATHER-TURBO-VENT-FILTER-/121108515290?fits=Car+Make:Land+Rover|Model:Freelander&hash=item1c32a149da:g:KgkAAOSwFnFWBVka

Many thanks.

traffic0703 said:

Thanks for the reply. Mine appears never to have been changed so will do that. Is it important to get a Land Rover one?

Click to expand...

Part number is PHB000450 it is the filter for the EGR solenoid valve STC4198. http://www.rimmerbros.co.uk/Item--i-PHB000450

guineafowl21 said:

It protects the breather pipe that comes from the vacuum-actuated variable vane mechanism on the turbo. This pipe allows pressure to equalise on the non-vacuum side of the diaphragm, and the filter stops sh!te from being drawn in.

Click to expand...

It is the EGR modulator breather filter according to Land rover..

I am confused now. The part Wammers has sent a link for is the part I was on about.

Is there also a vent filter for the turbo as well or just this EGR modulator breather filter?

Thanks

traffic0703 said:

I am confused now. The part Wammers has sent a link for is the part I was on about.

Is there also a vent filter for the turbo as well or just this EGR modulator breather filter?

Thanks

Click to expand...

Look at the turbo set up on the TD4 engine on here. http://lrparts.ru/engl/ I am not familiar with the TD4 to be honest. What is described as the EGR solenoid valve only seems to modulate the turbo vanes. There maybe another modulator for the EGR valve which should have a similar filter. Have a look through the Freelander parts list.

There's only one filter in the TD4 vacuum system. It's sole purpose is to keep debris out of the atmospheric side turbo vane actuator. It's nothing to do with the EGR system. The EGR vacuum actuator has an atomistic port, on the atmospheric side of its diaphragm. It's a simple hole, as that is all that's needed. The EGR diaphragm is stainless steel, so more resilient than the turbo actuator's composite material.

Nodge68 said:

There's only one filter in the TD4 vacuum system. It's sole purpose is to keep debris out of the atmospheric side turbo vane actuator. It's nothing to do with the EGR system. The EGR vacuum actuator has an atomistic port, on the atmospheric side of its diaphragm. It's a simple hole, as that is all that's needed. The EGR diaphragm is stainless steel, so more resilient than the turbo actuator's composite material.

Click to expand...

I don't think you understand how the modulator works. One end of the filter must be free to atmosphere.

wammers said:

I don't think you understand how the modulator works. One end of the filter must be free to atmosphere.

Click to expand...

Whatever.

The filter is called an EGR modulator breather as it was first used on Td5 Defender and Discovery 2 in that application.

The Td4 EGR modulator has a built in filter on the "atmospheric" side so doesn't need a separate pipe and filter

Aaaanyway... For reference, the filter you want is this one:

http://www.island-4x4.co.uk/filter-turbo-vent-britpart-phb000450-p-3268.html

If you mean this one (smack in the middle of pic):

Yes that is the one. Thanks

td4van said:

The filter is called an EGR modulator breather as it was first used on Td5 Defender and Discovery 2 in that application.

The Td4 EGR modulator has a built in filter on the "atmospheric" side so doesn't need a separate pipe and filter

Click to expand...

Also used on P38.. Part number for the modulator is STC4198 same part number for P38 EGR modulator. http://www.rimmerbros.co.uk/Item--i-STC4198 Top connector is vacuum from source middle one is modulated vacuum output and bottom one is filtered vent outlet/inlet. When valve is being modulated it varies vac from top connector to middle connector to give an as required variable vacuum. Air is drawn in via filter to lower vac from source to apply the desired vac to outlet. To either variably open or close as needed by the ECU the EGR valve or in this instance change the turbo vane setting. When vac is no longer needed and the modulator is inactive air comes in via the filter to allow the actuator to return to rest under spring pressure. It is noted that the modulator may work in a slightly different manner for turbo application. But the principal remains the same.

^^^ Why does he keep going on about EGR modulators while we're talking about the turbo vent filter?

guineafowl21 said:

^^^ Why does he keep going on about EGR modulators while we're talking about the turbo vent filter?

Click to expand...

Look up the part number and see what it is described as. The STC4198 EGR modulator and the Freelander turbo modulator are the same item. And work in exactly the same way.