L322 4.2 S/C MY2006 102,000km.

Out of curiosity I had a look at the compressor in the spare wheel well and discovered that the sintered brass silencer was missing from the exhaust valve. I have read through a few threads here that explain how they become clogged and can cause problems with lowering the vehicle, and see that they can be replaced cheaply, or cleaned, or modified by drilling a hole.

My suspension seems to be running perfectly OK. The compressor looks shiny and brand new (though the air lines show manufacture dates of 2006). So I guess the cover keeps it well protected and clean.

Is it something I should replace? Does its absence create any problems? Should the dessicant in the drying chamber be replaced? (I read that the dessicant breaks down to dust and that can block the silencer).

Or is it something that I just ignore?

If people drill a hole in it to help vent pressure they may as well just remove it as all gets filtered if its got a gaping hole in the filter.

Always made me wonder, why you wanted a filter on the exhaust? BMW i3 Electric Car
2012 Full Fat RR 4.4 TDV8 (now gone)
2006 VW Touareg 3.0 TDi V6

I think it's just there to break up and silence the escaping air, it's quieter to have the air broken up by the sintered brass than just an open pipe, drilling a hole just helps it to exhaust quicker and still keeps some form of silencer......

I'd replace it but that's just me.... Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I think its also the inlet as well as the exhaust, might be wrong though

Years since I looked at one, ignore my post then... does seem a bit pointless drilling a hole in a filter though...!! Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I agree Pete… and I’m one of those that drilled a hole in theirs. The car was stuck up in extended mode and only supposed to go 30mph. Garage quoted £700 to fit a new compressor. Think you can get the silencer bit for less than £40. The only time you can really hear the compressor running is if the seats are folded and the carpets up.

I did try cleaning the old silencer in brake cleaner, but it had no effect….

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

https://www.ebay.co.uk/itm/144480676130?ha...R_Lvt-OFYQ 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

mjdronfield wrote:

I agree Pete… and I’m one of those that drilled a hole in theirs. The car was stuck up in extended mode and only supposed to go 30mph. Garage quoted £700 to fit a new compressor. Think you can get the silencer bit for less than £40. The only time you can really hear the compressor running is if the seats are folded and the carpets up.

I did try cleaning the old silencer in brake cleaner, but it had no effect….

It looks like you can get the silencers pretty cheaply from Ali Express - if you know what thread size to order :

https://www.aliexpress.com/item/4000112203...XtCYUqdDJf

And if you want to do seal and dessicant upgrade, these people seem to know what they are talking about. Scroll past the product info for more details about diagnostic codes and likely causes.

https://4x4airseals.com/product/hitachi-ai...repair-kit

Since no one has mentioned any downside to the silencer being missing I think I will just leave mine alone. I dont have a back box on the exhaust, and I have a platform built in the back for the dog, so I can hardly hear the compressor or the exhaust valve.





Cheers.