Breather - filter

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THE BUDDAH

THE BUDDAH

New Member
Posts
686
Location
Romford essex
Hello,

There is a circular type filter (breather) thing attached to a pipe that goes to the front right hand side of my 2.5 tdi Range Rover rocker cover....please can someone enlighten me to what it is. I need to replace it, it has come away from the rocker cover and oil is making my engine nasty...lol.

It wont stay in situ.....any ideas.


Thank you.

Mike.
 
It's the crankcase PCV valve - a breather, exactly as you alluded to. I have the same problem with mine - BMW engines are notorious for dodgy breather systems. I will be replacing mine ASAP as my engine is currently sucking unfiltered air through it.
 
as clarky says it is a positive crank ventilation valve, it is dealer only and costs in excess of £100 by memory i think it is near £130
you will have to remove rocker cover to replace it as the reason it has come away is the plastic part has snapped which leaves half still in the rocker cover.
also it only comes as a complete unit you cant just buy the bit that is broken!
 
It appears to have tabs on it that are a push-lock into the rocker cover hole. Mine is missing one, hence why it won't stay in. Shouldnt be any need to remove the rocker cover, I would have thought.

At that price, it's time to start ringing scrappies... Or just replace it with a makeshift catch tank and plug the hole in the intake trunking.
 
Clarky130 said:
It appears to have tabs on it that are a push-lock into the rocker cover hole. Mine is missing one, hence why it won't stay in. Shouldnt be any need to remove the rocker cover, I would have thought.

At that price, it's time to start ringing scrappies... Or just replace it with a makeshift catch tank and plug the hole in the intake trunking.
Click to expand...

Don't plug the hole in the intake make sure the breather is connected as it should be, it relies on suction from the inlet to function correctly. On early none EGR engines it opens automatically to vent the crankcase. On EGR engines it gives a constant negative pressure (vacuum) in crank case to vent it. Blocking it could blow oil seals out.
 
Clarky130 said:
It appears to have tabs on it that are a push-lock into the rocker cover hole. Mine is missing one, hence why it won't stay in. Shouldnt be any need to remove the rocker cover, I would have thought.

At that price, it's time to start ringing scrappies... Or just replace it with a makeshift catch tank and plug the hole in the intake trunking.
Click to expand...

the fact that yours is missing one is the reason why you should remove the rocker cover as that broken off bit of plastic could well be sat in there!
granted there is a plate that should stop it dropping into the engine but better to be safe than sorry!
 
wammers said:
Don't plug the hole in the intake make sure the breather is connected as it should be, it relies on suction from the inlet to function correctly. On early none EGR engines it opens automatically to vent the crankcase. On EGR engines it gives a constant negative pressure (vacuum) in crank case to vent it. Blocking it could blow oil seals out.
Click to expand...

Nowt wrong with doing this - in fact it's a common mod on performance cars. Stops your intake air being contaminated with oil. What you CAN'T do is simply block up the hole in the crankcase - it needs to be vented, but it doesn't need anything 'sucking' oil fumes out - they will find their own way out. A vented 'catch tank' with some kind of oil / air seperator medium (fine wire wool works quite well) is then used, and the crankcase won't pressurise. Only drawback is you have to keep emptying and cleaning out the catch tank, which for most is too much hassle... Hence why cars have a system that dumps the fumes into the intake. It's also to prevent the oil / air fumes leaving the vehicle as 'emissions'.
 
Clarky130 said:
Nowt wrong with doing this - in fact it's a common mod on performance cars. Stops your intake air being contaminated with oil. What you CAN'T do is simply block up the hole in the crankcase - it needs to be vented, but it doesn't need anything 'sucking' oil fumes out - they will find their own way out. A vented 'catch tank' with some kind of oil / air seperator medium (fine wire wool works quite well) is then used, and the crankcase won't pressurise. Only drawback is you have to keep emptying and cleaning out the catch tank, which for most is too much hassle... Hence why cars have a system that dumps the fumes into the intake. It's also to prevent the oil / air fumes leaving the vehicle as 'emissions'.
Click to expand...

Yeah ok understand that, but better to run the standard setup. A performance car it ain't.:)
 
epic something each week- never a dull moment.

speaking of which doris is in bed so I'm off to join her before junior wakes up again half the night.
 
Wonder what my next disaster-followed-by-LZ-assisted-self-recovery wil be....???

Surely there can't be much left on this thing to break....?

(on reflection, perhaps I should have put that in the AG 'Famous Last Words' thread!)
 
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