Disco 2 oil breather

Oil breather that pushes in to turbo/ intercooler pipe...

Removed and soaked in petrol over night to clean out, blew out with airline and heard a pop, looked in side one of the holes and there is a red coloured diaphragm (I think ?) that looks like it's popped out.

Is this critical or will it cause a problem if used until I can replace it ?

Thanks

do you mean the crankcase breather(depression controll) valve (the mushroom shaped one after the MAF)?...if yes put a good one ASAP cos it's important

Yes that one, pushes in to hose that goes to turbo and small pipe goes to rocker cover.

Will look at getting one sooner rather than later then.

Thanks

Just wondering about this DCV (akin to a PCV valve on a petrol engine). Does anyone know if there's a cut-through view of the DCV somewhere (is it just mainly plastic with a spring somewhere?)? I understand it closes down when the turbo really starts to move so that the amount of oil vapour pulled through is reduced - is that right?

Now, I have an original DCV (2003 Disco 2 Td5) and wondering if I should replace it? I understand what sierrafery says about plastic degradation when exposed to heat and oil fumes and I understand therefore it should ideally be an item that is replaced now and again. I've seen one locally for c.$50 but not sure whether it's worth spending $50 on a "black mushroom/toadstool" given I'm not aware if it is causing me any issues at the moment? I looked at those Mann+hummel Provent oil mist catch cans recently and I was thinking it might ultimately be better going down that route rather than spending $50 on a DCV when I'm not even sure if it is of any benefit/detriment at the moment? Hoping an experienced, technically minded Disco enthusiast can put me on the right track: stay with what I have (original DCV), spend $50 on a new DCV, or look at the Provent solution? What about giving the original DCV a good spray with MAF cleaner or IPA?

You can't restore a such old DCV with spray, as i said it's pure plastic with a diaphragm in it which wears out in time and doesnt work as it should ... it's named depression control valve cos it closes under load as to avoid depression in the crankcase and excess of crankcase gasses into the inlet...it's a vital part of the crankcase emission control system, it's your choice what you'll do, replace it or fit a provent which has it's own DCV in it but do something ASAP...btw the engine has it's own oil separation system as well:

sierrafery said:

You can't restore a such old DCV with spray, as i said it's pure plastic with a diaphragm in it which wears out in time and doesnt work as it should ... it's named depression control valve cos it closes under load as to avoid depression in the crankcase and excess of crankcase gasses into the inlet...it's a vital part of the crankcase emission control system, it's your choice what you'll do, replace it or fit a provent which has it's own DCV in it but do something ASAP...btw the engine has it's own oil separation system as well:

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Okay, thanks Sierrafery - you got me! Seeing you're confirming it's all plastic construction (has to have been affected by heat/oil/time) I'll order one right now because if I do go with the Provent option it'll probably be a while down the track after I attend to a list of other preventative maintenance "issues"! Cheers.

Just purchased then - $55 delivered!

well done...you might even feel an improvement in throttle response cos if the valve is blocked closed the MAF reading grows faster at low revs due to the lack of pressure behind it or if it doesnt close well the MAF reading is lower at high revs due to the excess of pressure behind it and this means under or over fuelling... i keep replacing mine after around 25K miles all the time