Yes GGDR agree.

By 2012 LR should have known of the problem with a simple fix if the engine is not installed yet.On the assembly line this is easy to fix.

Not a pretty picture when the top LR product leave smokescreens on motorways....not good for the image  2012 TDV8 Vogue SE 4.4

With lockdown and little use, have your seals dried out and failed to an extent? John
2008 Stornoway Grey 3.6 Tdv8 Vogue
2005 TD6 Java Black Vogue - Written off!!
GAP iiD BT
2003 Discovery TD5 Auto, Nanocom Evolution - gone to a new home!
MasseyFerguson 152 - No electronics!! - Sold

I think there is a good possibility that it is the case  2012 TDV8 Vogue SE 4.4

northernmonkeyjones wrote:

I’m pretty sure what the turbo drain mod does is simply give it a path back to the sump.

It does, so why the scavenge pump???

The parts involved....

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 BMW i3 Electric Car
2012 Full Fat RR 4.4 TDV8 (now gone)
2006 VW Touareg 3.0 TDi V6

Possibly due to positive crankcase pressure, but really, just guessing.

Basically the solution is to drill a hole in the side of the sump/block, and plumb it in. How or why this bodge fix works I don’t know, which is why I never bothered to have it done. Having some YT LR tech drill into my engine wasn’t on the cards.... There is nothing that can't be fixed with a hammer😜😜
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It's the sump:

I started this thread back in 2016.
B.B. was a real bad smoker.
I wasn’t happy about the thought of someone getting out the black and decker to drill my sump, but I couldn’t accept the thought of worrying every year will it fail the MOT smoke test....
4 years later and I have still never seen the remotest hint of smoke since the job was done, and despite my initial worries I have no hesitation in recommending this mod to any owner with a smokey engine.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

I don't specifically know why the slow drive allows oil to build-up without the extra, direct to sump drain but it suggests that the turbo's seals have become very weak to the extent that the scavenger pump can't produce a low enough pressure.

The scavenger pump is fitted to both the V6 and V8 versions of the engine because their secondary turbos are mounted lower down than the primary turbos and it was considered that the unassisted drains might not drain properly with the engine on the side-slopes that LR vehicles can otherwise be used. In looking for a solution to the TDV6 identical smoke problem it was easy to re-instate the higher direct drain hole that was used in the twin (cf bi-) turbo 2.7 Jag engines which was still in the 3.0's casting to test if the oil drained sufficiently on the side slopes, which it did. The 4.4's sump didn't continue the 3.6's direct drain attachment facility so the make-shift fix was to drill and tap the old 3.6 drain hole to allow a fitting to be screwed into the sump.

That makes sense, thank you. BMW i3 Electric Car
2012 Full Fat RR 4.4 TDV8 (now gone)
2006 VW Touareg 3.0 TDi V6

Digressing a little, a new early 3.0 RRS here in Oz eventually had the engine replaced under warranty when serious smoke couldn't be stopped by multiple new secondary turbos then a new scavenger pump. It seemed that the oil-way connecting the turbo drain reservoir at the bottom of the sump with the scavenger pump at the top of the back of the right head must have been blocked or severely restricted. This was when LR was replacing lots of turbos, including my D4's, thinking that the turbo's seals had failed rather than the real cause. My D4 was due for another turbo just after the end of warranty but still covered for the earlier fault when the updated drain was released which I then fitted myself, being more convenient for me.

Thanks GraemeS for a very good explanation of this problem.

Will drive the car longer over the weekend to see if the problem is of a more permanent nature. 2012 TDV8 Vogue SE 4.4

If it continues after multiple "boots" then a drain might be needed.
Unrelated but might be worth noting. My secondary turbo was replaced due to it leaking oil. I never had smoke before or after and I regularly booted it (when warm) before and after new turbo. Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
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Previous week booted it a few times and no smoke :DVisiting gamepark tomorrow,so plenty slow travelling!This will be the test.Will report back!
Regards 2012 TDV8 Vogue SE 4.4

Ok did do the trip to gamepark.

Happy to report that it does seem that the excessive smoking was due to the long period of standing!Enough time to test with long periods of slow driving.There is a hint of smoke after booting it after a period of slow driving but nothing so bad to justify the cost of eliminating it!!

Really enjoyed using the car again!!What a pleasure to overtake

Regards 2012 TDV8 Vogue SE 4.4

GraemeS wrote:

The secondary turbo has its own drain which is emptied using a camshaft-driven scavenger pump. The pump stops as soon as the engine stops yet oil pressure to the turbo and other bearings takes a while to leak out of all the bearings. The turbo oil would normally be sucked out via the drain by the pump but the pump is stopped, blocking oil flow so oil escapes from the turbo's bearings into the inlet side, pooling until cleared when the turbo is used. When the turbo's seals are new they don't allow oil to escape but as the seals aren't designed to hold oil pressure because the drain prevents pressure build-up, as the seals wear a little they will allow oil under pressure to escape when the drain in blocked.

The revised drain has a second pipe going directly into the sump, bypassing the scavenger pump.

Oil flow into a turbo is restricted by the size of the hole in the turbo to maintain oil pressure to the rest of the engine and the turbo's drain provides virtually no flow restriction.