Does CRD GU8 require EGR block etc.

[teach]

I have a 2010 GU8 CRD. Been doing lots of research and reading about NADS, ZD30 grenading etc. but still unclear about if my model Patrol requires NADS. Any info to clear this up would be handy.

[Bigrig]

Years 2000 - early 2003 mate. Yours is more than ok being a 2010.

Happy motoring old mate!!!

[Maxhead]

I personally wouldn't bother but lots have blocked the EGR, you need to drill a small hole in the block plate to stop the EGR errors. Or get a Scangauge to clear the errors.
The ECU controls the boost very well on these so dowes and needle valve is probably not needed. Definitely put a Provent catch can on if you have the room under the bonnet tho.

[teach]

Thanks for the replies.

Will do a Provent catch can then. Have been looking at Scangauge II or the Ultragauge as the extra info/data would be beneficial to know and monitor.

[mitchelljames]

Hi teach im in a similar situation i have the 08 GU CRD DX i have the blocking plate ready to install but everyone i talk to seems to think it can do more damage then good with the errors putting the vehicle into limp mode , i have also heard some people say you will need to put a hole in the blocking plate but then others say not to .
I have read lots on the scangauge II about clearing the errors , is it as simple as pushing a button ? Does it happen automatic? does it need to be done each time the car turns on ?
cheers

[tempestv8]

Years 2000 - early 2003 mate. Yours is more than ok being a 2010.

So, what you are saying is that there is no need for NADS for CRD motors. But as I understand it, Nissan Anti Detonation System consists of other components like an oil catch can.

Is the oil catch can not required for the CRD motor? Sorry for such a basic question - I'm only just coming up to speed with NADS and trying to understand if I can avoid such modifications buy buying a GU5 or later. I've worked out from some initial research through this forum that the GU 5 and later come with the CRD motor, and GU4 and earlier are fitted with the DI motor.

I am researching GU Patrols on behalf of a family member who is interested in purchasing one with an auto transmission. So I've been doing a lot of "catch up" research on the ZD30; please be patient with me asking questions that may be very well understood by this fraternity.

[the ferret]

Mate, all the carbon and crap from the exhaust along with the oil vapour from the PCV is not a good thing for any engine, blocking the EGR on the CRD can be done and there are members here that would agree.
Just do a search and read some of the stories.
Cheers, the ferret.

[tempestv8]

Hi Ferret,

Thanks for your reply. I did read up the EGR blank and that's one modification that's going to be a given. But my query is regarding the oil catch can - is that required for a CRD motor?

I've been trawling through the CRD threads and I haven't seen any CRD owner install a catch can, but maybe I've not used the right search words.

Thanks!

[the ferret]

Well that's a good that you are going to block the EGR, this will stop the carbon build up inside the Inlet manifold, step 1
The PCV allows oil vapour to mix with and cause the carbon to stick to the inlet manifold, step 2
Fitting a catch can stops most of the oil vapour entering the manifold.
Even after the engine is shut down, there is still oil vapour from the PCV inside the ducting that houses the MAF when not using a catch can.
This vapour sticks to the MAF and can send the wrong messages to the ECU, thus causing all sorts of problems regarding engine performance and fueling.
Whether it's a volks wagon or a Daimler, blocking the EGR is only a good thing.
Ya can take my word for it if you like or seek other opinions, you have my view on the system mods.
I have been known to be wr..........., sorry, can't say the word, ends in g tho.
Safe driving and enjoy your patrol.
Cheers, the ferret.
Here's ya inlet manifold at 150000ks with no EGR block and no catch can.

[tempestv8]

Hi Ferret,

Thanks for sharing that picture. It does look quite bad, and I've seen very similar pictures of Toyota diesel engines (D-4D 4 cylinder in Prado and D-4D V8 in Land Cruiser) exhibiting the exact same gunk build up.

I wonder how diesel specialists in European countries deal with this issue, because most EU countries have yearly emissions testing (MOT in the UK for example) and blocking off the EGR will only result in a fail during the annual check.

I am grateful that Australia has not introduced mandatory emissions testing, but I digress as that's another discussion along with environmental impact, etc.

Back on topic, so yes, fully agree CRD motor (any diesel motor fitted with EGR, really) will benefit from EGR block, and now you've explained that the CRD motor also requires an oil catch can.

Which leads me on to the next question: Is the catch can for a DI motor the same as for a CRD motor?

I did more reading last night on the Provent 200 catch can, but I didn't see any mention of it fitted to the crankcase ventilation circuit for CRD motors.

These pictures are all of the DI motors, from what I can tell: